Date: Sun, 01 Apr 2012 15:35:02 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: RW <rwmaillists@googlemail.com> Cc: freebsd-questions@FreeBSD.org Subject: Re: Access to Time Warner cable network Message-ID: <4F786796.5010903@FreeBSD.org> In-Reply-To: <20120401143541.4d7d186f@gumby.homeunix.com> References: <4F7798D0.7000404@a1poweruser.com> <4F77A360.9080601@herveybayaustralia.com.au> <4F77A6CA.50406@a1poweruser.com> <20120401143541.4d7d186f@gumby.homeunix.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig0F2AA40981F945458446DF10 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 01/04/2012 14:35, RW wrote: > I had a modem that did something similar, it issued a temporary private= > ip address and the replaced it with a routable address. It's fairly sad that they don't use the officially mandated[*] 169.254.0.0/16 netblock which is what DHCP clients/servers are supposed to use when they need to temporarily grab an address. > The difference here is that the DHCP server is in a different address > block to the DHCP server, but I'm not sure that's a problem. I think > that FreeBSD associates DHCP traffic with the interface its operating > on irrespective of normal routing. Huh? One of those servers should be a client perhaps? Yes. Contacting a DHCP server is done using Ethernet protocols (at least initially.[+]) Not using IP. That means DHCP client and server have to be on the same ethernet segment, or there should be a DHCP-relay on any routers between the client and server. If that fails, then the client can assign itself a link-local address and try that, but it is pretty uncommon in the wild. While you can run multiple different IP networks over the same physical ethernet segment, and so have DHCP servers that dish out addresses on networks distinct from any they have configured on their own interfaces, you're more likely to run into this sort of scenario if there are some DHCP relays in the picture. Cheers, Matthew [*] RFC 5735 [+] Well, also except for IPv6 -- DHCP6 just uses the auto link-local addresses which are pretty much always configured on any IPv6 capable interface. --=20 Dr Matthew J Seaman MA, D.Phil. PGP: http://www.infracaninophile.co.uk/pgpkey --------------enig0F2AA40981F945458446DF10 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.16 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk94Z50ACgkQ8Mjk52CukIz1AACeO0mnORaae8RWeO7hrBQnnu59 CuAAnisn4op3ORsnFM8JyY6E3awScTVY =P8VJ -----END PGP SIGNATURE----- --------------enig0F2AA40981F945458446DF10--
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