None of these are correct anyway, read: http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-addr-arch-v3-11.tx t Which is to replace RFC2373 any day now. Michel. _ ____ __ __ ____ _ _ _ _ | | | _ \ \ \ / / / ___| | \ / | | | | | Michel Py | | | |_| | \ \ / / | |__ | \/ | | |__| | Sr. Network Engineer | | | __/ \ \/ / | _ \ | \ / | | __ | CCIE #6673 | | | | \ / | |_| | | |\/| | | | | | mpy@ieee.org |_| |_| \/ \___/ |_| |_| |_| |_| IPv6 Multihoming Solutions http://arneill-py.sacramento.ca.us/ipv6mh http://arneill-py.sacramento.ca.us/public/ipv6mh/ I'm in the process of reviving ipv6 on our network. I'm new to IPv6 so this questions is perhaps obvious. I found an old company document which lists the following format for an IPv6 address. | 16 | 19 | 13 | 16 | 64 bits | +-+---------+------+-----------+--------+-----------------+ | 0x2001 | sTLA | NLA | SLA ID | Interface ID | +-+---------+------+-----------+--------+-----------------+ I'm confused here, reading RFC2373 I found the folowing format |3| 13 | 8 | 24 | 16 | 64 bits | +-+---------+-----+------------+--------+-----------------+ | | TLA ID | RES | NLA ID | SLA ID | Interface ID | +-+---------+-----+------------+--------+-----------------+ Hmmm, what's wrong. -Jeroen- -- Jeroen Valcke sst@belnet.be jeroen.valcke@belnet.be