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Document why we don't send both FQDN and hostname options.

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This commit is contained in:
Roy Marples 2014-05-02 06:40:21 +00:00
parent c68ed24a38
commit d5571c7a56
1 changed files with 9 additions and 0 deletions
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9
dhcp.c
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@ -828,6 +828,15 @@ make_message(struct dhcp_message **message,
ifo->options & DHCPCD_HOSTNAME_SHORT ? 1 : 0);
else
hostname = ifo->hostname;
/*
* RFC4702 3.1 States that if we send the Client FQDN option
* then we MUST NOT also send the Host Name option.
* Technically we could, but that is not RFC conformant and
* also seems to break some DHCP server implemetations such as
* Windows. On the other hand, ISC dhcpd is just as non RFC
* conformant by not accepting a partially qualified FQDN.
*/
if (ifo->fqdn != FQDN_DISABLE) {
/* IETF DHC-FQDN option (81), RFC4702 */
*p++ = DHO_FQDN;