mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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CVE-2017-12997/LLDP: Don't use an 8-bit loop counter.
If you have a for (i = 0; i < N; i++) loop, you'd better make sure that i is big enough to hold N - not N-1, N. The TLV length here is 9 bits long, not 8 bits long, so an 8-bit loop counter will overflow and you can loop infinitely. This fixes an infinite loop discovered by Forcepoint's security researchers Otto Airamo & Antti Levomäki. Add tests using the capture files supplied by the reporter(s). Clean up the output a bit while we're at it.
This commit is contained in:
Guy Harris
Denis Ovsienko
parent
979dcefd7b
commit
34cec721d3
@ -651,7 +651,7 @@ lldp_private_8021_print(netdissect_options *ndo,
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int subtype, hexdump = FALSE;
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int subtype, hexdump = FALSE;
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u_int sublen;
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u_int sublen;
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u_int tval;
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u_int tval;
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uint8_t i;
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u_int i;
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if (tlv_len < 4) {
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if (tlv_len < 4) {
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return hexdump;
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return hexdump;
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@ -787,9 +787,9 @@ lldp_private_8021_print(netdissect_options *ndo,
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ND_PRINT((ndo, "\n\t Application Priority Table"));
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ND_PRINT((ndo, "\n\t Application Priority Table"));
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while(i<sublen) {
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while(i<sublen) {
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tval=*(tptr+i+5);
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tval=*(tptr+i+5);
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ND_PRINT((ndo, "\n\t Priority: %d, RES: %d, Sel: %d",
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ND_PRINT((ndo, "\n\t Priority: %u, RES: %u, Sel: %u, Protocol ID: %u",
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tval >> 5, (tval >> 3) & 0x03, (tval & 0x07)));
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tval >> 5, (tval >> 3) & 0x03, (tval & 0x07),
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ND_PRINT((ndo, "Protocol ID: %d", EXTRACT_16BITS(tptr + i + 5)));
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EXTRACT_16BITS(tptr + i + 5)));
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i=i+3;
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i=i+3;
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}
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}
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break;
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break;
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@ -479,6 +479,8 @@ dns_fwdptr dns_fwdptr.pcap dns_fwdptr.out -vvv -e
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isis-areaaddr-oobr-1 isis-areaaddr-oobr-1.pcap isis-areaaddr-oobr-1.out -vvv -e
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isis-areaaddr-oobr-1 isis-areaaddr-oobr-1.pcap isis-areaaddr-oobr-1.out -vvv -e
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isis-areaaddr-oobr-2 isis-areaaddr-oobr-2.pcap isis-areaaddr-oobr-2.out -vvv -e
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isis-areaaddr-oobr-2 isis-areaaddr-oobr-2.pcap isis-areaaddr-oobr-2.out -vvv -e
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isis-extd-ipreach-oobr isis-extd-ipreach-oobr.pcap isis-extd-ipreach-oobr.out -vvv -e
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isis-extd-ipreach-oobr isis-extd-ipreach-oobr.pcap isis-extd-ipreach-oobr.out -vvv -e
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lldp-infinite-loop-1 lldp-infinite-loop-1.pcap lldp-infinite-loop-1.out -vvv -e
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lldp-infinite-loop-2 lldp-infinite-loop-2.pcap lldp-infinite-loop-2.out -vvv -e
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# RTP tests
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# RTP tests
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# fuzzed pcap
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# fuzzed pcap
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134
tests/lldp-infinite-loop-1.out
Normal file
134
tests/lldp-infinite-loop-1.out
Normal file
@ -0,0 +1,134 @@
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08:00:27:42:ba:59 > 01:80:c2:00:00:0e, ethertype LLDP (0x88cc), length 1755: LLDP, length 1741
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Chassis ID TLV (1), length 7
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Subtype MAC address (4): 08:00:27:42:ba:59
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0x0000: 0408 0027 42ba 59
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Port ID TLV (2), length 7
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Subtype MAC address (3): 08:00:27:42:ba:59
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0x0000: 0308 0027 42ba 59
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Time to Live TLV (3), length 2: TTL 120s
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0x0000: 0078
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Organization specific TLV (127), length 6: OUI Ethernet bridged (0x0080c2)
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Port VLAN Id Subtype (1)
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port vlan id (PVID): 0
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0x0000: 0080 c201 0000
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Organization specific TLV (127), length 7: OUI Ethernet bridged (0x0080c2)
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Port and Protocol VLAN ID Subtype (2)
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port and protocol vlan id (PPVID): 0, flags [supported] (0x02)
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0x0000: 0080 c202 0200 00
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Organization specific TLV (127), length 14: OUI Ethernet bridged (0x0080c2)
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VLAN name Subtype (3)
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vlan id (VID): 1
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vlan name: default
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0x0000: 0080 c203 0001 0764 6566 6175 6c74
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Organization specific TLV (127), length 13: OUI Ethernet bridged (0x0080c2)
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Protocol Identity Subtype (4)
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protocol identity:
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0x0000: 0080 c204 0800 0042 4203 0080 08
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Organization specific TLV (127), length 263: OUI Ethernet bridged (0x0080c2)
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Application Priority Subtype (12)
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RES: 0
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Application Priority Table
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 6, RES: 0, Sel: 2, Protocol ID: 49676
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 128
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Priority: 0, RES: 1, Sel: 4, Protocol ID: 3072
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 4, RES: 0, Sel: 0, Protocol ID: 32962
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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Priority: 0, RES: 0, Sel: 0, Protocol ID: 0
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0x0000: 0080 c20c 0000 0000 0000 0000 80c2 0c00
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0x0010: 0000 0000 0000 0080 c20c 0000 0000 0000
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0x0020: 0000 80c2 0c00 0000 0000 0000 0080 c20c
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0x0030: 0000 0000 0000 0000 80c2 0c00 0000 0000
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0x0040: 0000 0080 c20c 0000 0000 0000 0000 80c2
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0x0050: 0c00 0000 0000 0000 0080 c20c 0000 0000
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0x0060: 0000 0000 80c2 0c00 0000 0000 0000 0080
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0x0070: c20c 0000 0000 0000 0000 80c2 0c00 0000
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0x0080: 0000 0000 0080 c20c 0000 0000 0000 0000
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0x0090: 80c2 0c00 0000 0000 0000 0080 c20c 0000
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0x00a0: 0000 0000 0000 80c2 0c00 0000 0000 0000
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0x00b0: 0080 c20c 0000 0000 0000 0000 80c2 0c00
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0x00c0: 0000 0000 0000 0080 c20c 0000 0000 0000
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0x00d0: 0000 80c2 0c00 0000 0000 0000 0080 c20c
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0x00e0: 0000 0000 0000 0000 80c2 0c00 0000 0000
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0x00f0: 0000 0080 c20c 0000 0000 0000 0000 80c2
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0x0100: 0c00 0000 0000 00
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End TLV (0), length 0
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BIN
tests/lldp-infinite-loop-1.pcap
Normal file
BIN
tests/lldp-infinite-loop-1.pcap
Normal file
Binary file not shown.
161
tests/lldp-infinite-loop-2.out
Normal file
161
tests/lldp-infinite-loop-2.out
Normal file
@ -0,0 +1,161 @@
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08:00:27:0d:f1:3c > 01:80:c2:00:00:0e, ethertype LLDP (0x88cc), length 2130: LLDP, length 2116
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Chassis ID TLV (1), length 7
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Subtype MAC address (4): 08:00:27:0d:f1:3c
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0x0000: 0408 0027 0df1 3c
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Port ID TLV (2), length 7
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Subtype MAC address (3): 08:00:27:0d:f1:3c
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0x0000: 0308 0027 0df1 3c
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Time to Live TLV (3), length 2: TTL 120s
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0x0000: 0078
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Organization specific TLV (127), length 6: OUI Ethernet bridged (0x0080c2)
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Port VLAN Id Subtype (1)
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port vlan id (PVID): 1
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0x0000: 0080 c201 0001
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Organization specific TLV (127), length 7: OUI Ethernet bridged (0x0080c2)
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Port and Protocol VLAN ID Subtype (2)
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port and protocol vlan id (PPVID): 0, flags [supported] (0x02)
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0x0000: 0080 c202 0200 00
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Organization specific TLV (127), length 14: OUI Ethernet bridged (0x0080c2)
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VLAN name Subtype (3)
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vlan id (VID): 1
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vlan name: default
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0x0000: 0080 c203 0001 0764 6566 6175 6c74
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Organization specific TLV (127), length 13: OUI Ethernet bridged (0x0080c2)
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Protocol Identity Subtype (4)
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protocol identity:
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0x0000: 0080 c204 0800 0042 4203 0000 03
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Organization specific TLV (127), length 9: OUI Ethernet bridged (0x0080c2)
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EVB Subtype (13)
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EVB Bridge Status
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RES: 0, BGID: 0, RRCAP: 1, RRCTR: 0
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EVB Station Status
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RES: 0, SGID: 0, RRREQ: 0,RRSTAT: 0
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R: 7, RTE: 21, EVB Mode: EVB Bridge [1]
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ROL: 0, RWD: 30, RES: 0, ROL: 0, RKA: 15
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0x0000: 0080 c20d 0200 f55e 0f
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Organization specific TLV (127), length 266: OUI Ethernet bridged (0x0080c2)
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CDCP Subtype (14)
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Role: 0, RES: 0, Scomp: 0 ChnCap: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
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SCID: 3104, SVID: 3584
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SCID: 0, SVID: 167
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SCID: 1, SVID: 1
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SCID: 0, SVID: 194
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SCID: 224, SVID: 0
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SCID: 10, SVID: 1792
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SCID: 256, SVID: 256
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SCID: 12, SVID: 526
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SCID: 0, SVID: 0
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SCID: 2672, SVID: 16
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SCID: 16, SVID: 0
|
||||||
|
SCID: 3104, SVID: 3584
|
||||||
|
SCID: 0, SVID: 167
|
||||||
|
SCID: 1, SVID: 1
|
||||||
|
SCID: 0, SVID: 194
|
||||||
|
SCID: 224, SVID: 0
|
||||||
|
SCID: 10, SVID: 1792
|
||||||
|
SCID: 256, SVID: 256
|
||||||
|
SCID: 12, SVID: 526
|
||||||
|
SCID: 0, SVID: 0
|
||||||
|
SCID: 2672, SVID: 16
|
||||||
|
SCID: 16, SVID: 0
|
||||||
|
0x0000: 0080 c20e 0000 00a7 0010 0100 00c2 0e00
|
||||||
|
0x0010: 0000 a700 1001 0000 c20e 0000 00a7 0010
|
||||||
|
0x0020: 0100 00c2 0e00 0000 a700 1001 0000 c20e
|
||||||
|
0x0030: 0000 00a7 0010 0100 00c2 0e00 0000 a700
|
||||||
|
0x0040: 1001 0000 c20e 0000 00a7 0010 0100 00c2
|
||||||
|
0x0050: 0e00 0000 a700 1001 0000 c20e 0000 00a7
|
||||||
|
0x0060: 0010 0100 00c2 0e00 0000 a700 1001 0000
|
||||||
|
0x0070: c20e 0000 00a7 0010 0100 00c2 0e00 0000
|
||||||
|
0x0080: a700 1001 0000 c20e 0000 00a7 0010 0100
|
||||||
|
0x0090: 00c2 0e00 0000 a700 1001 0000 c20e 0000
|
||||||
|
0x00a0: 00a7 0010 0100 00c2 0e00 0000 a700 1001
|
||||||
|
0x00b0: 0000 c20e 0000 00a7 0010 0100 00c2 0e00
|
||||||
|
0x00c0: 0000 a700 1001 0000 c20e 0000 00a7 0010
|
||||||
|
0x00d0: 0100 00c2 0e00 0000 a700 1001 0000 c20e
|
||||||
|
0x00e0: 0000 00a7 0010 0100 00c2 0e00 0000 a700
|
||||||
|
0x00f0: 1001 0000 c20e 0000 00a7 0010 0100 00c2
|
||||||
|
0x0100: 0e00 0000 a700 1001 0000
|
||||||
|
Unknown TLV (97), length 14
|
||||||
|
0x0000: 0000 00a7 0010 0100 00c2 0e00 0000
|
||||||
|
Unknown TLV (83), length 256
|
||||||
|
0x0000: 1001 0000 c20e 0000 00a7 0010 0100 00c2
|
||||||
|
0x0010: 0e00 0000 a700 1001 0000 c20e 0000 00a7
|
||||||
|
0x0020: 0010 0100 00c2 0e00 0000 a700 1001 0000
|
||||||
|
0x0030: c20e 0000 00a7 0010 0100 00c2 0e00 0000
|
||||||
|
0x0040: a700 1001 0000 c20e 0000 00a7 0010 0100
|
||||||
|
0x0050: 00c2 0e00 0000 a700 1001 0000 c20e 0000
|
||||||
|
0x0060: 00a7 0010 0100 00c2 0e00 0000 a700 1001
|
||||||
|
0x0070: 0000 c20e 0000 00a7 0010 0100 00c2 0e00
|
||||||
|
0x0080: 0000 a700 1001 0000 c20e 0000 00a7 0010
|
||||||
|
0x0090: 0100 00c2 0e00 0000 a700 1001 0000 c20e
|
||||||
|
0x00a0: 0000 00a7 0010 0100 00c2 0e00 0000 a700
|
||||||
|
0x00b0: 1001 0000 c20e 0000 00a7 0010 0100 00c2
|
||||||
|
0x00c0: 0e00 0000 a700 1001 0000 c20e 0000 00a7
|
||||||
|
0x00d0: 0010 0100 00c2 0e00 0000 a700 1001 0000
|
||||||
|
0x00e0: c20e 0000 00a7 0010 0100 00c2 0e00 0000
|
||||||
|
0x00f0: a700 1001 0000 c20e 0000 00a7 0010 0100
|
||||||
|
End TLV (0), length 194
|
||||||
BIN
tests/lldp-infinite-loop-2.pcap
Normal file
BIN
tests/lldp-infinite-loop-2.pcap
Normal file
Binary file not shown.
Loading…
Reference in New Issue
Block a user