Tagged Questions
1
vote
0answers
100 views
Packets not received by TUN device
I created a TUN device(nat64) and created a route so that all the required packets are forwarded to the TUN device from an eth device. But, I see that many packets are not received by the TUN device.
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1
vote
1answer
309 views
tcpdump and https
Why following command doesnt grab the packets to faceebook site
sudo tcpdump host facebook.com and dst port 443
but next grabs
sudo tcpdump host java.com
2
votes
1answer
704 views
iptrace for linux: how can I trace full packet contents?
I normally use iptrace on our AIX servers to get packet traces but have recently found out that this doesn't work for other 'nix systems - namely Centos.
Does anyone know what the analog would be?
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8
votes
1answer
494 views
what level of the network stack does tcpdump get its info from?
As I was trying in vain to fix a faulty ethernet controller here, one thing I tried was running tcpdump on the machine.
I found it interesting that tcpdump was able to detect that some of the ICMP ...
7
votes
1answer
2k views
Buffer size for capturing packets in kernel space?
Going through the man page of tcpdump, it seems kernel can drop the packets if the buffer is full. I was wondering if:
that size is configurable and/or
where can I see the size for my distro?
From ...
2
votes
1answer
455 views
Is it possible to capture all network traffic using tcpdump?
I have 3 computers on the same sub-net. Computer A and B are communicating with each other (ping, telnet, etc.). I'd like to see the packets between A and B on computer C. Is it possible to do this ...
0
votes
2answers
544 views
Understanding tcpdump output on a linux router
My router has an atm0 interface and a VLAN (atm0.1) interface, atm0.1 has the WAN IP address.
When using tcpdump -i atm0, the packets captured are only outgoing packet (LAN to WAN).
05:34:19.504895 ...
