I know of packet marking in iptables.

But could anyone enlighten me which field of an ip packet does the netfilter, mark ?? Is it related with the marking scheme in QoS ??

i could find no doc stating exactly which field of a packet is marked. I tried netfilter.org, google to no avail.

i felt tcpdump is a roughshod way to figure it out so decided to ask.

thanks,

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