I am run 0.10.14. I was trying to see if I could figure out
which router has the smallest MTU. My environment is Vlan enabled Cisco
mulitilayer switching with windows xp sp2. Here are my command lines:
C:\ ping webwall -l 1273 -f
Pinging webwall.xxxx.com [172.16.2.103] with 1273 bytes of
data:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Ping statistics for 172.16.2.103:
Packets: Sent = 4, Received = 0, Lost = 4
(100% loss),
C:\ >ping webwall -l 1272 -f
Pinging webwall.xxxx.com [172.16.2.103] with 1272 bytes of
data:
Reply from 172.16.2.103: bytes=1272 time=1ms TTL=127
Reply from 172.16.2.103: bytes=1272 time=1ms TTL=127
Reply from 172.16.2.103: bytes=1272 time=1ms TTL=127
Reply from 172.16.2.103: bytes=1272 time=1ms TTL=127
When I turned on ethereal, it only captured the successful
ICMP echo request/reply packets. There was no trace of the attempt using the
oversize packets. Why is that? Obviously the router generated the error because
it couldn’t fragment the packets. Can someone shed some light on this?
I am using Realtek RTL8139/810x FE NIC.
Thanks,
Daniel