Connectivity to Brazil

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Tue Feb 1 14:19:53 CST 2011


On Tue, 01 Feb 2011 08:54:47 EST, Steve Danelli said:

> Some carrier, somewhere between us and the service provider is selectively
> dropping the IKE packets originating from our VPN gateway and destined for
> our Brazil gateway. Other traffic is able to pass, as are the IKE packets coming
> back from Brazil to us. This is effectively preventing us from establishing
> the IPSEC tunnel between our gateways.

Has IKE been known to work to that location before? Or is this something new?
My first guess is some chucklehead banana-eater at the service provider either
fat-fingered the firewall config, or semi-intentionally blocked it because it
was "traffic on a protocol/port number they didn't understand so it must be
evil".

> Also something else is awry, for two given hosts on the same subnet (x.y.z.52
> and x.y.z.53), they take two wildly divergent paths:

> Anyone have any insight on to what may be occurring?

The paths appear to diverge at 67.16.142.238.  I wonder if that's gear trying
to do some load-balancing across 2 paths, and it's using the source IP as a
major part of the selector function ("route to round-robin interface source-IP
mod N" or similar?).

The other possibility is your two traceroutes happened to catch a routing flap in
progress (obviously not the case if the two routes are remaining stable).

Sorry I can't be more helpful than that...
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