Date: Thu, 18 May 1995 12:04:50 -0400 From: Garrett Wollman <wollman@halloran-eldar.lcs.mit.edu> To: Vivek Khera <khera@kciLink.com> Cc: freebsd-bugs@FreeBSD.org Subject: networking failure Message-ID: <9505181604.AA23570@halloran-eldar.lcs.mit.edu> In-Reply-To: <199505172144.RAA00210@pokey.kciLink.com> References: <199505172144.RAA00210@pokey.kciLink.com>
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<<On Wed, 17 May 1995 17:44:36 -0400, Vivek Khera <khera@kciLink.com> said:
> Anyhow, I've hardwired my laptop using a null modem to one of my servers to
> connect to the internet using ppp. I noticed that when the connection is
> down, the laptop cannot talk to itself other than on the localhost address.
> I've included a typescript output to demonstrate.
> [pokey]~% netstat -in
> Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
> lp0* 1500 <Link> 0 0 0 0 0
> lo0 16384 <Link> 3 0 3 0 0
> lo0 16384 127 127.0.0.1 3 0 3 0 0
> ppp0* 1500 <Link> 0 0 0 0 0
Here is the important part: there is NO interface which has an address
of 204.117.82.6. Your ICMPs are indeed getting sent to the loopback;
the IP code then discovers that the packets are not intended for this
machine, and since they came through the loopback, they are dropped.
If you had looked at this key statistic from `netstat -p ip':
21362 packets not forwardable
...you would have seen it increasing one for every packet sent by your
pinging.
-GAWollman
--
Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ...
wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence. We like people
MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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