Security Basics mailing list archives
RE: how to trace what is accessing the nic ?
From: "Burton Strauss" <BStrauss3 () comcast net>
Date: Sat, 23 Apr 2005 09:20:30 -0500
netstat -a That will show you (unless you've been rootkitted) which process has what port open. Also, you might want to dump the packet details - that might have interesting data. -----Burton -----Original Message----- From: Bonmariage, Serge [mailto:serge.bonmariage () GETRONICS com] Sent: Friday, April 22, 2005 8:45 AM To: security-basics () securityfocus com Subject: how to trace what is accessing the nic ? Hi everyone, There is happening something very strange on one of our Linux SMTP gateway. We've recently discovered that it is sending some strange TCP packets to always the same private address. [root@server1 root]# tcpdump -i eth0 tcpdump: listening on eth0 14:29:50.226313 server1.mysite.com.59806 > 192.168.234.236.5860: S 312929991:312929991(0) win 5840 <mss 1460,sackOK,timestamp 1658853393 0,nop,wscale 0> (DF) 14:29:53.222040 server1.mysite.com.59806 > 192.168.234.236.5860: S 312929991:312929991(0) win 5840 <mss 1460,sackOK,timestamp 1658853693 0,nop,wscale 0> (DF) 14:29:59.222028 server1.mysite.com.59806 > 192.168.234.236.5860: S 312929991:312929991(0) win 5840 <mss 1460,sackOK,timestamp 1658854293 0,nop,wscale 0> (DF) However we don't detect any other abnormal acvtivity. The question is quite basic but is there a way to trace which process is trying to send these packets? Thanks, Serge Bonmariage Getronics Belgium NV www.getronics.com
Current thread:
- how to trace what is accessing the nic ? Bonmariage, Serge (Apr 22)
- RE: how to trace what is accessing the nic ? Burton Strauss (Apr 25)
- Re: how to trace what is accessing the nic ? Andreas Putzo (Apr 25)
- <Possible follow-ups>
- RE: how to trace what is accessing the nic ? Joshua Berry (Apr 25)
- Re: how to trace what is accessing the nic ? H Carvey (Apr 25)
- RE: how to trace what is accessing the nic ? Bonmariage, Serge (Apr 25)
- RE: how to trace what is accessing the nic ? Simon Li (Apr 25)