[6bone] Problems with big packets!?

[Bill Owens]

At 12:40 +0200 10/4/02, Alvaro Vives wrote:
>Hi all,
>
>We've a host connected to 6BONE through a tunnel. The traceroute6 and ping6
>to 3ffe:3328:6:2b01::a100 works fine, BUT if we try:
>
>#ping6 -s 5000 3ffe:3328:6:2b01::a100
>
>ALL the packets are lost! (-s specifies the size in bytes).

Your ping program probably isn't doing MTU discovery, and is trying 
to send packets (or fragments) larger than the MTU somewhere along 
the path. Try

   ping6 -v -s 5000 3ffe:3328:6:2b01::a100

and look for "Packet too big" messages coming back from one of the routers.

Bill.