127 reputation
19
bio website haoz.org
location Beijing, China
age 23
visits member for 3 years, 6 months
seen Mar 8 at 9:37

An undergraduate Computer Science student

  • who have been programming since 2000
  • with strong interest in Computer Science

Learn more about me at LinkedIn profile


May
28
awarded  Popular Question
Apr
11
awarded  Notable Question
Mar
4
awarded  Popular Question
Sep
30
awarded  Popular Question
Oct
22
awarded  Autobiographer
Sep
8
comment How to solve “403 Forbidden” on CentOS6 with SELinux Disabled?
I like the answer as it tries to use 'su apache -s /bin/bash' to diagnose the problem.
Sep
3
awarded  Popular Question
Mar
9
awarded  Commentator
Mar
9
comment Linux - Run a daemon as 'nobody'
Hi voretaq7 and @Zoredache, can you provide a link or explain on the proper way of create a dedicated user for the daemon with appropriate restrictions? Thank you.
Feb
15
accepted Is there some capture filter (or alternatives) that is especially useful for wireless capture?
Feb
14
awarded  Student
Feb
14
comment Is there some capture filter (or alternatives) that is especially useful for wireless capture?
The wireless capturing part is already working. Maybe I'll have to filter and export. Display filter does not work as capture filter.
Feb
14
awarded  Supporter
Feb
14
asked Is there some capture filter (or alternatives) that is especially useful for wireless capture?
Apr
9
accepted tcpdump How do I use it to capture all traffic headers
Mar
30
comment tcpdump How do I use it to capture all traffic headers
@Marcin it really is MByte/sec. I'm dumping it to an internal drive. However, if I do what jliendo suggested in his answer, I guess the disk io should be around 100Mbit/sec which should be ok without RAID. How many RAM cache does tcpdump use and is there anything I can do to enlarge it? If I can, should I do it?
Mar
30
comment tcpdump How do I use it to capture all traffic headers
Thank you for patiently posted so much for me. You really helped! Sorry, but still something I want to hear your opinion. What is the usual bottleneck that affects packet loss. How should I know if it has happened? Is there something I can do to avoid this (given enough hardware resource), i.e. is there any configuration I can make to boost tcpdump performance?
Mar
30
comment tcpdump How do I use it to capture all traffic headers
@Marcin Actually, as I don't know about tcpdump much, the most straightforward way for me would be write a C/C++ program and use libpcap to capture, check certain rules and then store it. But I am really worried about the performance as this is 100MByte/sec. However, I guessed tcpdump could do this great. Anyway, what's the solution if we don't care about #4? Thank you!
Mar
30
comment tcpdump How do I use it to capture all traffic headers
@Scott I'm not sure about it. I was told that the switch is configured so that all flow would be mirrored to this port. Would you please explain why this is important? I know a few about networks, but mostly from textbooks, RFCs and papers, rather than real-life experience. Thank you!
Mar
30
asked tcpdump How do I use it to capture all traffic headers