[j-nsp] Branch SRX and satellite

[Tim Eberhard]

What you're most likely running into is the DHCP ttl limitation.

While it's not often a problem, the SRX sends out a DHCP request with
a TTL of 1.

http://forums.juniper.net/t5/SRX-Services-Gateway/SRX-DHCP-client-sends-discover-request-with-TTL-1/td-p/99180

I've seen this in the past, and while rare it does happen every now
and again depending on the ISP. As far as I know there hasn't been an
feature to tweak the TTL for dhcp discover requests.

I hope this helps,
-Tim Eberhard

On Mon, May 28, 2012 at 5:29 PM, Aaron Dewell <aaron.dewell at gmail.com> wrote:
>
> Hi all,
>
> I've been having a problem with an SRX210 connected to a Wildblue satellite modem (Surfbeam 2 if it matters).  This is DHCP which appears to be proxied by the modem.  There are a couple of different states, but neither work:
>
> Case 1: No ARP entry for the DHCP default route (forwarding table entry says "hold")
> Case 2: ARP entry but cannot ping the router or anything else
>
> Upon reboot, it works right after obtaining the lease for about 10 seconds, then stops (in one of those two states).
>
> Their "troubleshooting" method involves plugging it into a PC, which works, at which point they wash their hands of it, saying it's clearly a router problem.  I have swapped in an SRX100, as well as another 210, and both exhibit identical symptoms.  Also, the router works connected to a CX111/VZW Aircard.  And it has been working for a few months and only quit last week (no change in SRX config).
>
> The current best theory is an invalid ARP packet which windows accepts but JunOS does not.  That explains case #1 but not #2.
>
> I have the Wildblue people going out to swap out the modem tomorrow morning (too bad they can't just send one to switch) on the theory that it's the most likely thing to be the problem.
>
> Has anyone had any issues with an SRX connected to a  satellite modem before?  Any suggestions would be greatly appreciated!
>
> Thanks!
>
> Aaron
>
>
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