From: HP-France,ex2 ("SANCHEZ-MONGE,ANTONIO)
Date: Wed Nov 12 2003 - 12:54:06 GMT-3
Hello all,
RFC 1191 specifies that ICMP unreachable packets for MTU issues must contain
the MTU of the next hop.
Is there any way to make Cisco behaviour non-RFC compliant, I mean, to send
the ICMP unreachable packets WITHOUT the next hop MTU in the payload?
In other words, I would like to suppress the "01 cc" extra information from
the ICMP payload in the following packet:
================================ IP Header (inbound -- [ICS])
================
Source: 192.168.2.2(C) Dest: 192.168.2.1(C)
len: 56 ttl: 255 proto: 1 cksum: 0x330c id: 0x365
flags: NONE tos: 0x0 hdrlen: 20 offset: 0x0 optlen: 0
-------------------------------- ICMP Header
---------------------------------
type: UNREACH chksum: 0x5ee1
code: IP_DF caused drop
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ IP Header/Data
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0: 45 00 05 dc 99 0e 40 00 3f 06 18 bb c0 a8 02 01 E.....@.?.......
16: c0 a8 01 01 cc fd 00 14 d4 63 fa b0 -- -- -- -- .........c......
Please note I am NOT asking how to suppress ICMP redirects nor how to use
adjust-mss, path-mtu-discovery, etc... I already tested those options and
understood how they work.
I guess the answer is: Cisco is RFC compliant, no way to suppress this info
from the ICMP PDU, but I wanted to ask just in case.
Best regards,
Antonio.
This archive was generated by hypermail 2.1.4 : Fri Dec 12 2003 - 12:29:11 GMT-3