Snort mailing list archives
Re: TCP reserved flags: which is it?
From: Chris Keladis <Chris.Keladis () cmc optus net au>
Date: Sun, 21 Jul 2002 15:55:30 +1000
Hi John, The flags represent the same. It just seems like ACID prints them out in a different order.You still have reserved flags 1 and 2 set, regardless if you read them as 2 and 1.
Regards, Chris. John Sage wrote:
Received some tcp:25 packets with the reserved flag bits set. snort 1.8.7 reports: =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 07/17-20:11:24.884824 209.167.90.34:47060 -> 12.82.129.7:25 TCP TTL:47 TOS:0x0 ID:26375 IpLen:20 DgmLen:60 DF 12****S* Seq: 0x7D870B18 Ack: 0x0 Win: 0x16D0 TcpLen: 40TCP Options (5) => MSS: 1380 SackOK TS: 303867600 0 NOP WS: 0=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ while ACID reports the same packet as: ------------------------------------------------------------------------------ #(267 - 8) [2002-07-17 20:11:24] TCP to 25 smtp IPv4: 209.167.90.34 -> 12.82.129.7 hlen=5 TOS=0 dlen=60 ID=26375 flags=0 offset=0 TTL=47 chksum=11154 TCP: port=47060 -> dport: 25 flags=21****S* seq=2106002200 ack=0 off=10 res=0 win=5840 urp=0 chksum=32298 Options: #1 - MSS len=4 data=0564 #2 - SACKOK len=0 #3 - TS len=10 data=121CA6D000000000 #4 - NOP len=0 #5 - WS len=3 data=00 Payload: none ------------------------------------------------------------------------------ Note that snort has the flags as 1 - 2 while ACID has them as 2 - 1 Which is it? I'd tend to believe snort... - John
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Current thread:
- TCP reserved flags: which is it? John Sage (Jul 17)
- Win32 - libpcap questrion Anonymous - Mike (Jul 18)
- Re: Win32 - libpcap questrion Erek Adams (Jul 18)
- Re: TCP reserved flags: which is it? John Sage (Jul 20)
- Re: TCP reserved flags: which is it? Phil Wood (Jul 21)
- Re: TCP reserved flags: which is it? John Sage (Jul 21)
- Re: TCP reserved flags: which is it? Phil Wood (Jul 22)
- Re: TCP reserved flags: which is it? John Sage (Jul 22)
- Re: TCP reserved flags: which is it? Phil Wood (Jul 21)
- Win32 - libpcap questrion Anonymous - Mike (Jul 18)
- Re: TCP reserved flags: which is it? John Sage (Jul 21)
- Re: TCP reserved flags: which is it? John Sage (Jul 22)