dhcpd still doesn't work on tunnel interfaces?
Phil Mayers
p.mayers at imperial.ac.uk
Wed Feb 2 16:51:53 UTC 2011
All,
I would like to respond to DHCPv6 requests received via a GRE tunnel
interface on Linux. There are mentions in the archives in 2006/2007
about dhcpd having "hard-coded" assumptions of ethernet-like interfaces,
and therefore not being able to work in this manner, even for receiving
unicast, relayed packets.
This seems to still be the case under 4.1 - is there any chance it will
ever be fixed?
I am specifically trying to work around a bug in Cisco IOS, where the
DHCPv6 relay function does not work if the next-hop is an MPLS-labelled
path. You can work around this by building a GRE tunnel from the
router(s) to the DHCP server(s) - if ISC dhcpd would respond that is,
which it won't :o(
I am aware "fixing IOS" is the right approach, but Cisco aren't
interested. They deny that it's even a bug, claiming that it's "not
supposed to work in that config", and no amount of pushing has succeeded
in changing that PoV.
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