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TOPIC: ARP issue on the router with HSRP.

ARP issue on the router with HSRP. 8 years 11 months ago #23897

  • ramasamy
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We have a ISA server configured with failover. The ISA server is having the Vritual IP and MAC address and 2 routers are in HSRP.

The router and ISA Server are on the same network but i am not able to ping the Vritual IP address of the server from the router. and i am able to ping the ISA server Physical IP address.

From other devices i am able to ping the vritual IP address.

I have given the show arp command and found that the Router is not able to get the ARP entry only for the Vritual IP address

Internet 0 Incomplete ARPA

In the debug output of the ARP

2d02h: IP ARP: rcvd req src 0019.aa1e.e81b, dst GigabitEthernet0/1.309
2d02h: IP ARP: sent req src 0019.56eb.fa1b, dst 0000.0000.0000 GigabitEthernet0/1.309
2d02h: IP ARP throttled out the ARP Request for

Can any one help me in this case.

Thanks in advance..
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Re: ARP issue on the router with HSRP. 8 years 11 months ago #23906

  • Smurf
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This is something that we came across because the actual reply comes from the physical and the switch ports don't learn the virtual MAC which caused us problems with the switch ports being flooded.

We manually added the MAC addresses to the switch ports that the servers are plugged into.

This may be similar to your issue.

IGMP Snooping can also be configured to stop the broadcast storms that can occur with NLB
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Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit or PM me for details.
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