> Linux will not proxy arp for an address on interface X if the route for > that address points back to interface X (That's what you call a routing > loop). Do have have a host-specific route for the address that points > somewhere else? If you want to use iptables REDIRECT target to capture > the traffic, then I think a simple "route add -host b.stanford.edu dev > lo" will work. one sec...i dont think i gave you the full details. i understand your point about the routing loop. my method is something like this: yes a.stanford.edu does proxy arp for b.stanford.edu though there is no route setup etc however i want to use NAT/iptables and DNAT the packet which comes into the interface [because of the proxy arp] and tunnel it via another interface to a new destination . of course the tunnel is setup properly and in general the DNAT works but the packet never seems to come because there never seems to be a arp-reply from the comp hope i was clear. Vikram > > Vikram wrote: > > >Hi, > > > >I am having trouble using proxy arp with RH7.2 [linux 2.4.7-10 stock > >kernel which comes with it] > > > >Proxy arp doesnt seem to work. I have hosts a.stanford.edu and > >b.stanford.edu on the same subnet. b.stanford.edu is no longer there, and > >a.stanford.edu is set to proxy arp for it....so that it can get its > >packets [for a specific reason which is not so relevant here,hopefully]. > > > >i set the proxy arp entry in a.stanford.edu as follows: > > > >arp -Ds b.stanford.edu eth0 pub > > > >and then ping b.stanford.edu from some host outside. a tcpdump shows the > >gateway router doing an arp who-has b.stanford.edu but there is no arp > >reply at all from a.stanford.edu ?? > > > >can anyone tell me what i have missed ? > > > > > > Vikram > > > >- > >: send the line "unsubscribe linux-net" in > >the body of a message to majordomo@vger.kernel.org > >More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > -- > Casey Carter > Casey@Carter.net > ccarter@uiuc.edu > AIM: cartec69 > > > > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
