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Old 04-11-2008, 12:00 AM   #1
nmb1081
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Sending ICMP messages of type 3 when packet size exceeds MTU of the interface


I have configured an interface with a MTU of 1200. Now, if i send a ping with Don' fragment bit set (ping -s 1400 -M do), the linux box silently drops this packet rather than sending ICMP messages of type 3, code 4 (Destination Unreachable, Fragmentation required, and DF set) when packet size exceeds MTU of the interface. Is there a way, I can get the linux box to send an ICMP type 3, code 4 message when it gets a packet crossing the MTU of the interface.

Last edited by nmb1081; 04-11-2008 at 04:23 AM. Reason: For clarity
 
Old 04-13-2008, 10:14 PM   #2
hariprs
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Quote:
Originally Posted by nmb1081 View Post
I have configured an interface with a MTU of 1200. Now, if i send a ping with Don' fragment bit set (ping -s 1400 -M do), the linux box silently drops this packet rather than sending ICMP messages of type 3, code 4 (Destination Unreachable, Fragmentation required, and DF set) when packet size exceeds MTU of the interface. Is there a way, I can get the linux box to send an ICMP type 3, code 4 message when it gets a packet crossing the MTU of the interface.
I think it is possible using iptables.
 
  


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