RH 7.2 host not answering arp requests

[Don Knott <dknott@awebco.com>]

I have a RH 7.2 box (all current errate) setup to handle connections to 3
networks.

Network A comes in via a Sangoma WAN card over FR
Network B comes in via eth1
Local network is eth0

I have almost everything working (network translation, firewalling) except
for the connection to Network B.  On the other side of eth1 is a router
(that I don't control). When I bring up that interface (eth1) I also
reboot the router to clear its arp cache.  When the router comes back up
it begins arping. eth1 will not answer the arp requests. I tcpdump eth1
and I see the arp requests but no answer from eth1.

I've tried:

echo "1" > /proc/sys/net/ipv4/conf/eth1/proxy_arp
and also
echo "1" > /proc/sys/net/ipv4/conf/all/proxy_arp

I've tried to manually populate the local arp cache 
/sbin/arp -i eth1 -s 162.143.XX.XXX 00:60:97:35:E1:D4 pub

I checked with ifconfig to see if the interface was brought up with -arp 
but it wasn't.

Searching the web I found some stuff talking about arp-filter. Currently 
apr-filter is set to 0 and I haven't found a good expanation of what 
arp-filter does so I haven't messed with that yet.

The only interim solution I've found is a arp daemon from Freshmeat. I'd 
like to get this working with the native proxy_arp.

As a sidenote, this box is deployed in a local county government agency in
Florida. Out of 67 counties only 1 is using Linux for firewalling and NAT
to the networks listed above. The other 66 use expensive or less flexible
propietary solutions :)

Thanks...

-- 
"Why do we force the world to be Word-compliant and not force Microsoft to be world
compliant?" -Bert Garcia
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