Re: [Snort-users] DF and MF

From: Andreas Östling <andreaso(at)it.su.se>
Date: Sun Apr 06 2003 - 03:15:54 EDT

On Sat, 5 Apr 2003, Jeff Nathan wrote:

> Linux PMTU discovery will set DF on a packet with MF already set. It's
> anomalous but the Linux folks tend to disagree.
...

Some (all?) Solaris boxes like to set MF + DF as well. Here is a fragmented ping to a Solaris box:

04/06-08:38:03.624114 10.0.0.1 -> 192.168.0.1 ICMP TTL:255 TOS:0x0 ID:9889 IpLen:20 DgmLen:1500 MF Frag Offset: 0x0000 Frag Size: 0x05C8

04/06-08:38:03.624117 10.0.0.1 -> 192.168.0.1 ICMP TTL:255 TOS:0x0 ID:9889 IpLen:20 DgmLen:548 Frag Offset: 0x00B9 Frag Size: 0x0157

04/06-08:38:03.625745 192.168.0.1 -> 10.0.0.1 ICMP TTL:254 TOS:0x0 ID:18581 IpLen:20 DgmLen:1500 DF MF Frag Offset: 0x0000 Frag Size: 0x05C8

04/06-08:38:03.625792 192.168.0.1 -> 10.0.0.1 ICMP TTL:254 TOS:0x0 ID:18581 IpLen:20 DgmLen:548 DF Frag Offset: 0x00B9 Frag Size: 0x0157

/Andreas

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http://www.geocrawler.com/redir-sf.php3?list=snort-users Received on Mon Apr 7 04:01:15 2003