Snort mailing list archives
Snort inline setup issues
From: The Adept <adept () stephans org>
Date: Thu, 28 Sep 2006 10:27:34 -0500
I am setting up a snort IPS on a Gentoo 2.6 box and I've run into a wall getting Snort to pass the packets out of the iptables queue. For testing I have the snort box which sits on a 10.x.x.x address, it has a dual ethernet card to use for the inline bridge. I have two different boxes connected to the dual ethernet card, one with 192.168.100.1 as its address and one with 192.168.100.2. The bridge (br0) works perfectly with -P FORWARD ACCEPT set and no snort. When I change policy to DROP packets are correctly dropped (all protocols). When I enable snort, it sees the packets and ICMP works (pings) but tcp does not. (log attached below) I'm not sure what I'm doing wrong. Everything appears to be set up correctly but no tcp sessions are being properly set up. Any suggestions? Thanks in advance for any advice. Cheers, Dan 09/28-09:52:23.122172 192.168.100.1 -> 192.168.100.2 ICMP TTL:64 TOS:0x0 ID:0 IpLen:20 DgmLen:84 DF Type:8 Code:0 ID:41257 Seq:256 ECHO =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 09/28-09:52:23.122394 192.168.100.2 -> 192.168.100.1 ICMP TTL:64 TOS:0x0 ID:4712 IpLen:20 DgmLen:84 Type:0 Code:0 ID:41257 Seq:256 ECHO REPLY =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 09/28-09:52:33.806050 192.168.100.1:33430 -> 192.168.100.2:22 TCP TTL:64 TOS:0x0 ID:58483 IpLen:20 DgmLen:60 DF ******S* Seq: 0xC52F7745 Ack: 0x0 Win: 0x16D0 TcpLen: 40 TCP Options (5) => MSS: 1460 SackOK TS: 250778422 0 NOP WS: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 09/28-09:52:36.801000 192.168.100.1:33430 -> 192.168.100.2:22 TCP TTL:64 TOS:0x0 ID:58484 IpLen:20 DgmLen:60 DF ******S* Seq: 0xC52F7745 Ack: 0x0 Win: 0x16D0 TcpLen: 40 TCP Options (5) => MSS: 1460 SackOK TS: 250778722 0 NOP WS: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ 09/28-09:52:42.800391 192.168.100.1:33430 -> 192.168.100.2:22 TCP TTL:64 TOS:0x0 ID:58485 IpLen:20 DgmLen:60 DF ******S* Seq: 0xC52F7745 Ack: 0x0 Win: 0x16D0 TcpLen: 40 TCP Options (5) => MSS: 1460 SackOK TS: 250779322 0 NOP WS: 0 =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Snort inline setup issues The Adept (Sep 28)
- Re: Snort inline setup issues (SOLUTION) The Adept (Sep 28)