tcpdump mailing list archives
Re: libpcap and tc filters
From: Adam Katz <adamkatz0 () gmail com>
Date: Mon, 6 Jun 2011 11:55:08 +0300
my ip and tcp checksums should be correct, but i'll check it out. Could you point me in the direction of an ACTIVE mailing list with traffic shaping guys? The ones I found were pretty much abandoned. thanks! On Sun, Jun 5, 2011 at 7:59 PM, Aaron Turner <synfinatic () gmail com> wrote:
On Sun, Jun 5, 2011 at 12:29 AM, Adam Katz <adamkatz0 () gmail com> wrote:First of all, thanks for the quick reply. Well, I am using Linux, sorry for not mentioning that explicitly. tc isthebuilt in linux utility for (among other things) traffic shaping... it's a pretty useful piece of software. I use it to create three output queuesoneth0 with a scheduler that selects which of them to dequeue. Iimmediatelythough of the explanation you gave me and imagined pcap might bypass someofthe stack but it doesn't seem that way as packets sent with pcap do showupin those queues I created, they're only not classified correctly and endupin the default queue. If pcap was completely bypassing the stack, I imagine i would not haveseenthe packets in the queue at all.Correct. If they are getting classified, but not correctly, then I'd have to guess that the classification rules you're using don't match the traffic. No idea if it matters, but make sure your IP checksums are correct. When you captured the traffic, outbound traffic may have the wrong checksums. Other then that, may want to ask the traffic shaping guys. -- Aaron Turner http://synfin.net/ Twitter: @synfinatic http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety. -- Benjamin Franklin "carpe diem quam minimum credula postero" - This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
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Current thread:
- libpcap and tc filters Adam Katz (Jun 04)
- Re: libpcap and tc filters Aaron Turner (Jun 04)
- Re: libpcap and tc filters Adam Katz (Jun 05)
- Re: libpcap and tc filters Aaron Turner (Jun 05)
- Re: libpcap and tc filters Adam Katz (Jun 06)
- Re: libpcap and tc filters Aaron Turner (Jun 06)
- Re: libpcap and tc filters Adam Katz (Jun 06)
- Re: libpcap and tc filters Adam Katz (Jun 05)
- Re: libpcap and tc filters Aaron Turner (Jun 04)