Date: Mon, 10 Jun 2002 23:23:54 +0200 From: Stable User <stable@ei.bzerk.org> To: aaron g <click46@operamail.com> Cc: fbsd-q@bzerk.org, freebsd-questions@FreeBSD.ORG Subject: Re: Jail single ip network (FreeBSD 4.5) Message-ID: <20020610232354.A25245@ei.bzerk.org> In-Reply-To: <20020610205511.29606.qmail@operamail.com>; from click46@operamail.com on Tue, Jun 11, 2002 at 04:55:10AM %2B0800 References: <20020610205511.29606.qmail@operamail.com>
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On Tue, Jun 11, 2002 at 04:55:10AM +0800, aaron g typed:
>
> >> I then created the network alias, here is the output from ifconfig:
> >>
> >> xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> >> options=3<rxcsum,txcsum>
> >> inet 142.39.88.238 netmask 0xffffff00 broadcast 142.39.88.255
> >> inet6 fe80::2c0:4fff:fea0:86fa%xl0 prefixlen 64 scopeid 0x1
> >> inet 192.168.200.13 netmask 0xffffffff broadcast 192.168.200.13
> > ^^^^^^^^
> > Normally you would use such a netmask if your alias IP address is
> > in the same subnet as your primary IP address. Since they are in
> > unrelated networks you probably want to use a netmask of 255.255.255.0
> here.
>
> > Ruben
>
>
> actually, since this is an alias, you must set the netmask
> to 255.255.255.255. As of 4.6 [or perhaps 4.5? I cannot
*IF* both addresses are in the same subnet. In this case, they
are not.
> remember] you are forced to use this netmask or the alias
> will not work.
You can use any netmask you like if the addresses are in different
subnets:
ei# ifconfig ed0
ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.1.40 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:20:18:39:eb:5a
ei# ifconfig ed0 10.0.1.1 netmask 255.0.0.0 alias
ei# ifconfig ed0
ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.1.40 netmask 0xffffff00 broadcast 192.168.1.255
inet 10.0.1.1 netmask 0xff000000 broadcast 10.255.255.255
ether 00:20:18:39:eb:5a
ei# uname -a
FreeBSD ei.lan.bzerk.org 4.6-RC FreeBSD 4.6-RC #7: Sun Jun 9 22:29:27 CEST
2002 root@ei.lan.bzerk.org:/usr/obj/usr/src/sys/EI i386
>
> - aarong
> --
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