Re: AT&T/L3 interconnect?

[Richard A Steenbergen <ras () e-gerbil net>]

On Mon, Oct 11, 2010 at 02:48:00PM -0400, Deepak Jain wrote:
> > http://www.nanog.org/meetings/nanog45/presentations/Sunday/RAS_traceroute_N45.pdf
>
> I'd have thought I didn't need to provide credentials in NANOG, but 
> apparently one stays quiet too long and you're a noob.
>
> First, to those who have given me basic mpls, traceroute and ip primers 
> by off list email, thank you. It's not necessary. I appreciate your 
> willingness to help out the community.
>
> Second, I *know* that the traceroute I pasted a bit of has to do with 
> mpls magic (or similar). That's why I used the word tunnel. I wasn't 
> asking *how* it was done. I'm quiet capable of performing the same 
> magic. I just wanted to know if anyone off the top of their head knew 
> *where* the packets were magically popping back into the ether... LA, 
> Nevada, Denver. That's all. A physical location or a router IP would 
> have been a perfectly wonderful answer.

Hey Deepak,

Sorry, but they're actually right. Read the section on icmp tunneling, 
it explains exactly how and why you're seeing this behavior. :)

The return packets pop our at the end of the lsp, which is clearly 
in LA (or thereabouts, whatever lsrca is probably).

-- 
Richard A Steenbergen <ras () e-gerbil net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)