Date: Wed, 26 Sep 2001 10:38:27 -0400 From: Joe Abley <jabley@automagic.org> To: "Gary W. Swearingen" <swear@blarg.net> Cc: Chris <chris@chrisland.net>, freebsd-stable@FreeBSD.ORG Subject: Re: 127/8 continued Message-ID: <20010926103827.S37693@buffoon.automagic.org> In-Reply-To: <j2lmj2vjmy.mj2@localhost.localdomain> References: <20010924094048.X5906-100000@coredump.scriptkiddie.org> <3BB0A0A2.6CCC454B@chrisland.net> <j2lmj2vjmy.mj2@localhost.localdomain>
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On Tue, Sep 25, 2001 at 06:13:57PM -0700, Gary W. Swearingen wrote:
> Chris <chris@chrisland.net> writes:
>
> > Isn't that when we configure an IP on an interface, it will
> > automatically create a route for the corresponding "connected" network?
>
> Which seems more like a bug than a feature to me. Been giving me all
> kinds of grief. Even doing "ifconfig if# up" creates a unwanted network
> route which I then have to delete so packets will go to my gateway
> instead of out the interface as if there was no gateway.
Are you sure you're just not setting your interface netmask incorrectly?
If you configure the interface with a netmask of 255.255.255.255 there
should be no connected subnet route to add.
> It seems to be
> designed on the assumption that we have sufficiently large number of IP
> addresses to waste a lot of them on subnets.
Um :)
> I'd think that ifconfig
> (or is it the kernel) would at least have auto-routing optional.
It is optional. Use 255.255.255.255 as your netmask, and there is
no corresponding subnet route to add.
goose# ifconfig fxp0
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::2e0:81ff:fe01:790d%fxp0 prefixlen 64 scopeid 0x1
inet6 2001:438:1fff:fffc:2e0:81ff:fe01:790d prefixlen 64 autoconf
inet 216.8.159.18 netmask 0xfffffff0 broadcast 216.8.159.31
ether 00:e0:81:01:79:0d
media: Ethernet autoselect (10baseT/UTP)
status: active
goose# netstat -rn -f inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 216.8.159.17 UGSc 39 253 fxp0
127 lo0 UScB 0 0 lo0
127.0.0.1 127.0.0.1 UH 3 17535 lo0
216.8.159.16/28 link#1 UC 2 0 fxp0
216.8.159.17 0:4:76:ba:9c:17 UHLW 39 94814 fxp0 379
216.8.159.18 0:e0:81:1:79:d UHLW 0 11 lo0
goose# ifconfig fxp0 inet 1.1.1.1 netmask 255.255.255.255 alias
goose# ifconfig fxp0
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::2e0:81ff:fe01:790d%fxp0 prefixlen 64 scopeid 0x1
inet6 2001:438:1fff:fffc:2e0:81ff:fe01:790d prefixlen 64 autoconf
inet 216.8.159.18 netmask 0xfffffff0 broadcast 216.8.159.31
inet 1.1.1.1 netmask 0xffffffff broadcast 1.1.1.1
ether 00:e0:81:01:79:0d
media: Ethernet autoselect (10baseT/UTP)
status: active
goose# netstat -rn -f inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 216.8.159.17 UGSc 39 253 fxp0
1.1.1.1/32 link#1 UC 0 0 fxp0
127 lo0 UScB 0 0 lo0
127.0.0.1 127.0.0.1 UH 3 17535 lo0
216.8.159.16/28 link#1 UC 2 0 fxp0
216.8.159.17 0:4:76:ba:9c:17 UHLW 39 94814 fxp0 368
216.8.159.18 0:e0:81:1:79:d UHLW 0 11 lo0
goose#
Joe
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