161 reputation
3
bio website
location Michigan
age
visits member for 2 years, 4 months
seen Jun 13 at 18:30

In no particular order, I'm an:

Engineer; Programmer; Networker; Occasional Sysadmin; Parent; Perpetual Student; Spiritual Being; Wannabe Hacker; Nerd; Political Junkie; Scientist; White Hat; Geek

Also, a recovering, though often relapsing, n00b. :-)

Let's make code, not war.


Feb
12
awarded  Editor
Feb
12
revised How to find out why website is not accessible?
tiny change
Feb
6
awarded  Teacher
Feb
6
answered How to find out why website is not accessible?
Aug
9
comment How to capture ack or syn packets by Tcpdump?
Your answer is technically correct, but the OP probably meant to include the word "only" in his question. ;-) Cheers!
Aug
9
comment How to capture ack or syn packets by Tcpdump?
That's a nice example. You can simplify your tcpdump capture filter even further by replacing "'tcp[tcpflags] & (tcp-syn) != 0' and 'tcp[tcpflags] & (tcp-ack) == 0'" with just 'tcp[tcpflags] == tcp-syn'. That will automatically exclude packets with ACK set. Cheers!
Aug
9
comment How to capture ack or syn packets by Tcpdump?
This will capture any packets with the SYN flag set, including SYN, SYN-ACK, etc. If you want only SYN packets, use 'tcp[13] == 2' instead. Cheers!
Aug
9
comment How to capture ack or syn packets by Tcpdump?
This is a great answer with good references, but please note that this syntax will capture any packets that have the SYN or ACK flags set, even if other flags are also set. This may or may not be what the OP intended. Please see my answer below for a more strict filter if only TCP SYN or ACK packets are desired. Cheers.
Aug
9
answered How to capture ack or syn packets by Tcpdump?
Mar
1
answered Broadcom BCM5716 Hangs on CentOS 6 Boot
Feb
29
answered How to leave promiscuous mode in dnscap?
Feb
29
awarded  Supporter