Date: Fri, 29 Jan 1999 12:15:40 +0000 From: Brian Somers <brian@Awfulhak.org> To: Christopher Michaels - SSG <ChrisMic@sbservices.com> Cc: "FreeBSD Mailing List (E-mail)" <questions@FreeBSD.ORG> Subject: Re: tun0 interface address Message-ID: <199901291215.MAA02376@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Thu, 28 Jan 1999 15:52:23 EST." <6C37EE640B78D2118D2F00A0C90FCB441A5E75@site2s1>
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> Hello, > I am using FreeBSD 2.2.8-STABLE. I have 2 possibly unrelated questions. > > When the PPP link is dropped and then PPP redials and usually gets a new IP > number, now here's my questions. When I type ifconfig tun0 (or ifconfig > -a). The old IP number is still listed there, with a netmask of > 255.255.255.255. Is this standard behavior? If not, any idea what I may > have done wrong to my PPP configuration to have caused this? This is a feature. Things can be tidied up a bit if you check out ppp.linkdown.sample. Check http://www.FreeBSD.org/FAQ/userppp.html for the ``first connection'' problem to get a handle on why the ``feature'' is there. > Also, which my be related, I can't ping the IP address assigned to the tun0 > interface anymore. Everything appears to work fine, the ed1 and lo0 > interfaces respond to pings just fine. I can accept connections to the tun0 > interface (telnet, ident, ftp, etc...). It just will not respond to pings. > I have recently starting working with PPP filters and have setup a dial and > alive filters that deny ICMP but no "in" or "out" filters at all. The thing to bear in mind about local interface addresses is that there isn't necessarily a route to them. Ppp will ``reflect'' traffic that it sees for it's local interface address (unless you ``disable loopback''), but if it doesn't see it, nothing's reflected. This isn't usually an issue as most people use ppp as a client with a default route pointing at the other end of the link. With ethernet, because it's a broadcast medium, the route is implicit, and even if the driver doesn't reflect the packet, it'll go out on the wire and get read back again (I think). > Any suggestions would be helpful. > Thanks, > Chris -- Brian <brian@Awfulhak.org> <brian@FreeBSD.org> <brian@OpenBSD.org> <http://www.Awfulhak.org>; Don't _EVER_ lose your sense of humour ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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