[Xorp-users] ARP problems with static routes in XORP

[Allan Leinwand]

Hi Vikram,

   I believe that in XORP proxy ARP should be enabled by default. Are you sure that your routing table has the directly connected route to the subnet for 10.1.1.2? We've changed the routing table output in Vyatta OFR and I don't recall how to look at the unicast table in XORP.  Our command is "show route" :)

Take care,

Allan

----- Original Message -----
From: Vikram KAUL <vkaul at research.telcordia.com>
To: Allan Leinwand <allan at vyatta.com>
Cc: xorp-users at xorp.org
Sent: Wednesday, June 7, 2006 8:47:07 AM GMT-0800
Subject: Re: [Xorp-users] ARP problems with static routes in XORP


Allan,

 Thanks for your reply

allan>   It looks like your host may be doing the right thing, depending on how you have your default gateway set up. The host is sending an ARP for the destination IP address and the router (17.17.17.1) should reply with a proxy ARP if it has a route to 10.1.1.2. I'm assuming that this router has a directly connected route to 10.1.1.0/24.

The Router does get the arp request from the host, but there is no reply 
sent for that . I check that using tcpdump. 
Does something have to be enabled in XORP to reply arp requests for 
directly connected subnets ? I could not find that in the documentation. 

allan>
allan>I would make sure that:
allan>1) the host has a default gateway set to 17.17.17.1.  You can use netstat -r (Linux/Win) and check for the presence of a 0.0.0.0/0 route to 17.17.17.1.
allan>2) the router has a connected route to 10.1.1.0/24 (my assumption on your subnet mask)
allan>3) the router at 10.1.1.2 has a route (static or RIP derived) back to 17.17.17.0/24 (again, I'm assuming you're using a /24 here again).

I made sure of these when I was doing the test. 
Is there some hook/flag I can enable in XORP to see if the arps are being 
replied ?

Thanks
Vikram

_______________________________________________
Xorp-users mailing list
Xorp-users at xorp.org
http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users