["yuxiao jia" <yxjia@xxxxxxxxxxxxxxx>]

Hello,

 

I want measue forwarding delay for mpls packet in a LSR (label switch router) of MPLS network, for example

 

--------|  router  |---------------

      eth0        eth1

 

I run ethereal/tethereal on each interface to capture the packet arriving time and departure time, what I want get is a file which include packet identification (ip layer) and timestamp, I can have incoming file in etho, outgoing file in eth1. The reason is right now the only key used to identify a specific packet is packet identification. (for example 0xeaf0)..

 

Then based on packet identification, I can caculate each packet delay

 

I have some question

1. if I use tethereal, how can I only parse these two field (packet identification and timestamp)? can I ? I try a lot, if use -V option, too much filed.

 

2. The capture filter syntax canot work for me, I read tcpdump(8),, for example I want capture filer all traffic which destation port is 6000

 

./tethereal -i eth0 -t a -f 'dst port 6000'

it doesnot work,

 

Thanks in advance

 

Best regrads

 

yuxiao