It looks like something broke recently that severely limits the MTU in
Fedora 20 when running under NM.  Are other people seeing this too?
Here I'm pinging my upstream lan-to-wan gateway.  A 1200 byte ping fails
while a 500 byte one succeeds.  I see the same thing when pinging
between two identical, fully up-to-date f20 systems.

   wolfgang@arbol ~]$ ping -s 1200 gw
   PING gw.wsrcc.com (192.168.35.1) 1200(1228) bytes of data.
   ^C
   --- gw.wsrcc.com ping statistics ---
   3 packets transmitted, 0 received, 100% packet loss, time 2000ms

   [wolfgang@arbol ~]$ ping -s 500 gw
   PING gw.wsrcc.com (192.168.35.1) 500(528) bytes of data.
   508 bytes from gw.wsrcc.com (192.168.35.1): icmp_seq=1 ttl=64 time=0.503 ms
   508 bytes from gw.wsrcc.com (192.168.35.1): icmp_seq=2 ttl=64 time=0.460 ms
   508 bytes from gw.wsrcc.com (192.168.35.1): icmp_seq=3 ttl=64 time=0.456 ms
   508 bytes from gw.wsrcc.com (192.168.35.1): icmp_seq=4 ttl=64 time=0.454 ms
   ^C
   --- gw.wsrcc.com ping statistics ---
   4 packets transmitted, 4 received, 0% packet loss, time 3001ms
   rtt min/avg/max/mdev = 0.454/0.468/0.503/0.025 ms
   [wolfgang@arbol ~]$ 

-wolfgang
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