From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Feb 19 2007 - 13:03:57 ART
Yes this is normal. It's saying that if the device has the ip
address 1.2.3.4 and you say "ip route 0.0.0.0 0.0.0.0 1.2.3.4" it means
that it will ARP for all destinations that recurse to that next-hop.
The same is true when you point a static route out a multipoint
interface. The difference is that when you have a route pointing to a
next-hop value you perform layer 3 to layer 2 resolution on that
next-hop value. If you have a route pointing to a multipoint interface,
or to an IP address on the device itself, you perform layer 3 to layer 2
resolution for the final destination. Assuming that devices on the
segment support proxy-ARP this isn't an issue though.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Stefan Grey
Sent: Monday, February 19, 2007 8:16 AM
To: ccielab@groupstudy.com
Subject: ARP strange behaviour
Hello guys!
In a book I have read the following text:
"
If you specify in the ASA static route the destination ip address - the
ip
address of one of the security appliance interfaces as the gatway
address
the security appliance broadcasts an Address Resolution Protocol (ARP)
request for the MAC address of the destination IP address in the packet
instead of broadcasting a request for the MAC address of the gateway IP
address".
I think it's strange. Do the routers behave also always so?? I thought
that
the device always sends the ARP request for resolution of destination IP
address and than through proxyarp receives the MAC of the nexthop
router.
But I am absolutely not sure that it can happen so that the device sends
the
ARP request (even in some particular case) not for the destination IP
but
directly for the IP address of the nexthop router. Could you confirm
this or
tell me that my suspicions are wright...??
Thank you for any clarification on this.
"
This archive was generated by hypermail 2.1.4 : Thu Mar 01 2007 - 07:38:47 ART