Anybody got a T-mobile cellspot v2 to work with NAT'd firewall (IPFW)?

Randal L. Schwartz merlyn at
Mon Feb 26 20:21:15 UTC 2018

>>>>> "John" == John Reynolds <johnjen at> writes:

John> I can see that it is getting an IP address from my DHCP server and
John> through tcpdump I see that it is talking to tmobile's servers--but
John> it just abruptly "stops" and I get no further traffic to/from the
John> device once I get to this point:

Often these errors are caused by MTUs that are too large.  Some net
providers don't permit the ICMPs that enable MTU discovery, so I've
routinely added things like setting the MTU to 1300 just to make it all

Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn at> <URL:>
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