Tagged Questions
3
votes
1answer
112 views
Tell tcpdump to skip custom header
I have an IP packet with x bytes of custom header coming in on an interface. Is there a way to tell tcpdump or tshark to ignore the first x bytes and decode and display the IP packet? Any pointers ...
1
vote
1answer
293 views
Tcpdump: how to capture outgoing packets on a virtual interface?
On a Linux system that I am testing now, it has a couple of virtual L2 devices chained together to add/manipulate our own frame headers which are encaped between Eth header and IP header.
now this ...
8
votes
1answer
521 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 ...
2
votes
1answer
192 views
How to know the number of messages received in a message queue at a point of time
I have a implementation where the hardware dispatches 300 packets every second to a host application through DMA transfer and then to the host application's message queue.
When packets are sent at ...
0
votes
2answers
564 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 ...
