tcpdump mailing list archives

Re: activities report for July 2026


From: Guy Harris <gharris () sonic net>
Date: Sun, 2 Aug 2026 16:24:33 -0700

On Aug 2, 2026, at 3:42 PM, Denis Ovsienko <denis () ovsienko info> wrote:

It would be interesting to know if any non-libpcap use cases that use
"ret" (from the A register) exist.

Somebody who wants to capture TCP packets and wants the packets to be cut off after the first 20 bytes of TCP 
*payload*, especially if they're running on a link layer that has a variable-length header?

Or just "...after the first 20 bytes of IPv4 header" with a variable-length link-layer header?

(No API support for that in libpcap, though. They'd have to write their own filter code.)
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