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[lwip-devel] [task #14129] DNS: implement domain search list (e.g. fille
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From: |
Craig McQueen |
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Subject: |
[lwip-devel] [task #14129] DNS: implement domain search list (e.g. filled via DHCP) |
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Date: |
Tue, 13 Nov 2018 20:41:58 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 |
Follow-up Comment #3, task #14129 (project lwip):
A single domain can be obtained from DHCP option 15.
A domain search list could also be obtained from DHCP option 119. However,
from what I've read, Windows doesn't request option 119, and Windows DHCP
servers don't provide it. Linux and MacOS do request it though. See: Which
DHCP Client OS Support DHCP Option 119 Domain Suffix Search? - Server Fault
<https://serverfault.com/questions/37417/which-dhcp-client-os-support-dhcp-option-119-domain-suffix-search>.
Note that getting the domain from DHCP option 15 may be useful for other
things besides DNS domain. For example, RFC 3958
<https://tools.ietf.org/html/rfc3958> defines DDDS which does DNS look-ups of
services (using NAPTR, SRV) for the local domain which can be discovered with
DHCP option 15. E.g. RFC 6011 SIP User Agent Configuration
<https://tools.ietf.org/html/rfc6011> can use this. So, adding DHCP option 15
support can be useful even before DNS adds support for a domain search list.
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