Dropping reply received on <downstream interface> when using -iu/-id
Brian J. Murrell
brian at interlinx.bc.ca
Tue Jan 2 14:55:52 UTC 2018
On Tue, 2017-12-12 at 09:54 -0500, Brian J. Murrell wrote:
> I want to use the -iu/-id options with dhcrelay to prevent relays
> relaying (and thus duplicating) requests coming from the network that
> the DHCP server is on:
> # /usr/sbin/dhcrelay -4 -d -pf /var/run/dhcrelay4.pid -id br-guest
> -iu br-lan 10.75.22.247
> When I do this, DHCP Discover requests coming from clients on the br-
> guest interface have their Relay agent IP address set to the address
> the br-guest interface. When the DHCP server sends back an DHCP
> it sends it to the IP address of the br-guest interface on the relay
> machine. dhcrelay then proceeds to drop that reply:
> Dropping reply received on br-guest
> Is there something I am misunderstanding about how -iu/-id are
> to work?
>  I'm surprised this is not implicit to be honest. The relay knows
> which network the server is on. Why is it relaying requests that
> from that network to that network?
Any ideas about this?
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