On Thu, 10 Sep 1998, Nathan E Norman wrote:
> On Thu, 10 Sep 1998, Default Debian Reader wrote: > > : Anyone tell me what tos 0xc0 is in ip headers? > > First, install the doc-iana package. > > I'm no IP expert (I'm currently reading Stevens's IP Illustrated book) That book was copyright 1994, i imagine it was printed even before that. > but if you are referring to the Type Of Service field, 0xc0 is not a > valid choice. > That is my question, Is it valid because i have seen ip headers with a tos of 0xc0 or at least it appeared. > [ from /usr/doc/doc-iana/assignments/ip-parameters.gz ] > > TOS Value Description Reference > --------- -------------------------- --------- > 0000 Default [RFC1349] > 0001 Minimize Monetary Cost [RFC1349] > 0010 Maximize Reliability [RFC1349] > 0100 Maximize Throughput [RFC1349] > 1000 Minimize Delay [RFC1349] > 1111 Maximize Security [RFC1455] > > The TOS value is used to indicate "better". Only one TOS value or > property can be requested in any one IP datagram. > -- > > Note that the TOS field is an eight-bit field composed of a three-bit > precedence field, the 4-bit field described above, and one unused bit. > This is confusing since a TOS "value" of 0001 is written in hex as 0x02. > > 0xc0 would be 011000000, so two bits in the precedence field have been > set (and none of the TOS bits). According to Stevens, the precedence > field is ignored, so I'm not sure what's going on here :) > > -- > Nathan Norman > MidcoNet 410 South Phillips Avenue Sioux Falls, SD > mailto:[EMAIL PROTECTED] http://www.midco.net > finger [EMAIL PROTECTED] for PGP Key: (0xA33B86E9) > > >
