From: Andrew Short (ashort@xxxxxxxxxxxxxxx)
Date: Mon Feb 05 2001 - 12:13:47 GMT-3
If I knew the IP address, I would attempt to peer with it and then sniff
the reply packets for the remote ASN. I don't know if that would work but
I would TRY it. Also...there may are arin records on who owns which
address space and you might be able to match THAT with an ASN as well.
Not knowing the IP address...you'd have to make a few assumptions about
the remote router's medium and work with that. If it's ethernet...ping
the subnet broadcast to see if any routers return an icmp reply. If it's
frame relay, try inverse arp...if it's ATM...you're on your own. =-)
Also...look for the remote router trying to establish a session with your
router, that would most definitely have the remote ASN in the packet.
BUT...without knowledge of the IP and of the ASN's involved...you really
SHOULDN'T be trying to establish a peering session. Unless it's for lab
purposes. And I CAN tell you, that they do NOT withhold information from
you in the lab that isn't TOO difficult to find out for yourself. =-)
On Mon, 5 Feb 2001, Devender Singh wrote:
> How would you know AS number of the remote AS, or/and also ip address. Given
> that you cannot have any kind of access into the router and cdp is disabled.
>
> I donnot know. Any suggestions.
>
> Devender Singh
> BE(Hons), CCNP
> IP Solution Specialist
>
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