-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 8/21/07 7:31 PM, Chris Cappuccio wrote: > On a related note, I work with some equipment that uses TOS values and > some that uses DSCP. > > When you see a TOS value in tcpdump (0x68 for instance) just divide by 4 > to get the DSCP (and throw away any remainder.) The DSCP value uses the same > field in the IP packet as TOS, but ignores the last bits. So, DSCP to TOS > is simply multiply by 4 (and convert to hex)
Yes and no. TOS field definitions have changed over the years; there's a history of this moving target in RFC 3168, section 22. The 6-bit DSCP field is defined in RFC 2474. It does not ignore anything in TOS; if anything it's a superset. dn iD8DBQFGzMLgyPxGVjntI4IRAlYLAKDFgai2XDnrKb/hKXqGgdF7HhR4HwCfU0kZ HuUfxAcSHTW6oNohod7TcZA= =J8lb -----END PGP SIGNATURE-----
