Date: Fri, 21 Apr 2000 20:02:01 +0100 From: Nik Clayton <nik@freebsd.org> To: Nik Clayton <nik@freebsd.org> Cc: hackers@freebsd.org Subject: Re: No route for 127/8 to lo0 (?) Message-ID: <20000421200201.A34984@catkin.nothing-going-on.org> In-Reply-To: <20000331125739.A97865@catkin.nothing-going-on.org>; from nik@freebsd.org on Fri, Mar 31, 2000 at 12:57:40PM %2B0100 References: <20000331125739.A97865@catkin.nothing-going-on.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Mar 31, 2000 at 12:57:40PM +0100, Nik Clayton wrote:
> In the course of debugging why Samba was bringing my modem link up
> periodically, I discovered it was sending netbios packets to
> 127.255.255.255. Because the relevent entries from the routing table
> looked like
>
> Destination Gateway Flags Refs Use Netif Expire
> default 158.152.1.222 UGSc 22 0 tun0
> 127.0.0.1 127.0.0.1 UH 0 201 lo0
> [...]
>
> 127.255.255.255 was going out of the default route, tun0, and bringing
> the line up.
[...]
> I thought that 127/8 was the "local net", and that packets sent to any of
> those addresses would go via the loopback interface. That seems to be
> how Linux and Windows 98 do things (the only systems I can check this on
> at the moment). Assuming that's the case, why does FreeBSD only add a
> a host route to 127.0.0.1, and not a network route for 127/8? Various
> other people have confirmed that they only have a 127.0.0.1 host route
> as well, so I don't believe this is a misconfiguration of my system.
No one's actually been able to answer this, save a few comments that the
loopback interface is special-cased to do this in the code, and that the
code in question is quite old.
In light of that, I'd like to commit:
Index: rc.network
===================================================================
RCS file: /home/ncvs/src/etc/rc.network,v
retrieving revision 1.74
diff -u -r1.74 rc.network
--- rc.network 2000/02/29 12:53:28 1.74
+++ rc.network 2000/04/21 18:48:15
@@ -254,6 +254,9 @@
done
fi
+ # 127/8 goes through lo0.
+ route add -net 127 -interface lo0
+
echo -n 'Additional routing options:'
case ${tcp_extensions} in
[Yy][Ee][Ss] | '')
as a stop gap.
FWIW, the code in question is sys/netinet/in.c:in_ifinit(), around line
701. Comments?
N
--
Internet connection, $19.95 a month. Computer, $799.95. Modem, $149.95.
Telephone line, $24.95 a month. Software, free. USENET transmission,
hundreds if not thousands of dollars. Thinking before posting, priceless.
Somethings in life you can't buy. For everything else, there's MasterCard.
-- Graham Reed, in the Scary Devil Monastery
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20000421200201.A34984>