Re: Vlan Map and Traceroute

From: gladston@br.ibm.com
Date: Wed Jul 27 2005 - 12:21:47 GMT-3


Sorry Cisco and Group,

Thanks Patrick.

I found the reason why traceroute to 148.5.5.1 was working and 148.5.15.5 was not, which help me to make this mistake. There was a previous acl entry allowing it.

From Cisco:
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The source UDP port of the initial datagram probe is randomized and has logical operator OR with 0x8000 (ensures a minimum source port of 0x8000).

http://www.cisco.com/warp/public/105/traceroute.shtml
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My access-list should have the minimum 32768, if I was configuring source UDP.

R8-------vlan20------R2
 --> udp packet source x destination > 3343x



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