Date: Fri, 08 Apr 2011 23:16:44 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-hackers@freebsd.org Subject: Re: ifconfig output: ipv4 netmask format Message-ID: <4D9F894C.1030700@infracaninophile.co.uk> In-Reply-To: <BANLkTimtKiTTc49Aee6a-nfzKyHUoJAGNQ@mail.gmail.com> References: <4D9EFAC6.4020906@lazybytes.org> <7EA5889E-77EF-4BAE-9655-C33692A75602@bsdimp.com> <4D9F2C88.4010205@lazybytes.org> <BANLkTimtKiTTc49Aee6a-nfzKyHUoJAGNQ@mail.gmail.com>
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On 08/04/2011 16:53, Garrett Cooper wrote:
> One thing I've been curious about for a while that I haven't had an
> opportunity to look into is: what does IPV6 look like? I understand
> that the /netmask bit is added to the end of addresses, but what does
> the netmask actually look like?
Like this:
lucid-nonsense:~:% ifconfig re0 inet6
re0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 15=
00
options=3D389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCA=
ST,WOL_MCAST,WOL_MAGIC>
inet6 fe80::e2cb:4eff:fe26:6481%re0 prefixlen 64 scopeid 0x1
inet6 2001:8b0:151:1:e2cb:4eff:fe26:6481 prefixlen 64
inet6 2001:8b0:151:1:: prefixlen 64 anycast
inet6 2001:8b0:151:1:3950:9ee6:9c6b:8a8b prefixlen 64
inet6 2001:8b0:151:1:3fd3:cd67:fafa:3d78 prefixlen 64
inet6 2001:8b0:151:1:78ea:429a:bbd9:f62f prefixlen 64
inet6 2001:8b0:151:1:d2f:23d1:314c:5e2e prefixlen 64
inet6 2001:8b0:151:1:57f9:9484:e8b0:12d1 prefixlen 128
IPv6 doesn't deal in netmasks per-se: just in the length of the network
prefix. (64 is typical. 48 also fairly common.)
Cheers
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
JID: matthew@infracaninophile.co.uk Kent, CT11 9PW
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