Date: Sun, 25 May 2003 02:26:34 +0530 (IST) From: "Ashish Kulkarni" <ashish@symonds.net> To: <freebsd-questions@freebsd.org> Subject: changing the ToS in IP Header Message-ID: <44644.203.192.199.30.1053809794.squirrel@secure.symonds.net>
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Hello, Is there any way in which I can manipulate the Type of Service (TOS) byte in the IPv4 header? I need to set the TOS bits on all outgoing packets from my box to the ISP to a particular pattern (0x02), otherwise the ISP does not forward packets. I have been able to do this in Linux using the iptables mangle table: http://www.tldp.org/LDP/nag2/x-087-2-firewall.tos.manipulation.html but am unable to find a similiar packet-mangling feature in the firewalls running on FreeBSD...there are rules for matching on TOS pattern, but not on TOS manipulation. Does anyone know of any tool which can do this? As an alternative solution, is there any way to set the default TOS via a sysctl interface (similiar to that of TTL, namely net.inet.ip.ttl)? I'm planning to use this on my home box, so I have no problems in trying to patch and rebuild the kernel if I can get some feedback and/or tips on how to do so :-) Thanks, Ashish.
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