Date: Fri, 23 Jun 2000 00:41:45 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: cjclark@alum.mit.edu Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Confused by Loopback Message-ID: <20000623004145.B17268@hades.hell.gr> In-Reply-To: <20000621205221.A43715@pool0586.cvx20-bradley.dialup.e>; from cristjc@earthlink.net on Wed, Jun 21, 2000 at 08:52:21PM -0700 References: <20000621205221.A43715@pool0586.cvx20-bradley.dialup.e>
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> $ netstat -rn > Routing tables > > Internet: > Destination Gateway Flags Refs Use Netif Expire > default 207.217.148.27 UGSc 11 22 tun0 > 127.0.0.1 127.0.0.1 UH 0 0 lo0 > 207.217.148.27 209.179.254.29 UH 12 0 tun0 While not connected to the network, I can see in my machine: % netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire 127.0.0.1 127.0.0.1 UH 1 11250 lo0 > Notice there is no LAN entry for the 127-net like the ifconfig(8) mask > says. So if I were to do something silly like, > > $ ping 127.0.0.2 > > It goes out over the tun0 interface. I noticed this because for some > perverse reason I tried, > > $ ping 127.255.255.255 > > And started getting replies from other hosts! I tried a traceroute(8) > and watched 127.0.0.2 packets make their happy way out towards the > I'net. > > Tell me I'm missing something silly here. You have not missed anything. That is exactly the way it works. Why does it puzzle you? Because a network route for 127.0.0.0/8 does not exist in your routing table by default? If what puzzles you is that you actually *got* some replies back, you have to use a firewall to stop packets originating from, or destined to hosts in 127.0.0.0/8, from traversing your tun0 interface :) -- Giorgos Keramidas, < keramida @ ceid . upatras . gr > For my public key: finger keramida@ceid.upatras.gr To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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