Date: Mon, 20 Aug 2001 23:44:59 +0200 From: Daniel Rock <D.Rock@t-online.de> To: Brian Somers <brian@Awfulhak.org> Cc: current@FreeBSD.ORG, brian@freebsd-services.com Subject: Re: Syntax change in ppp? Message-ID: <3B8184DB.27C4718F@t-online.de> References: <200108201109.f7KB9XU80095@hak.lan.Awfulhak.org>
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Brian Somers schrieb: > > > Hi, > > > > after the latest updates I just noticed a different behaviour of ppp. > > > > in /etc/ppp/ppp.linkup I had an additional line > > iface clear > > for my profile to get rid of stuffed up IP pairs. After the latest update > > this entry also clears my defaultroute, but only after redialing. > > > > I now had to put the "iface clear" into /etc/ppp/ppp.linkdown, but then > > the old IP pair is still there during the next connection. > > Putting ``iface clear'' in ppp.linkup will result in the whole > iface-alias thing being broken. It's meant to be in ppp.linkdown. > > The objective is that ppp, once connected, has two IP numbers on the > interface, one for what was there before the connection completed and > one for the negotiated IP address. When this happens, the ``first > connection'' continues to work (the process that caused the dial-up > will be bound to the IP number that was on the interface when it > started and the nat engine will tweak these packets so that they use > the negotiated IP number). Suppose on the first connection I got the IP pair A <-> B and on the second C <-> D while the second one still active another person will get A <-> B assigned by our ISP. Will I be able to talk with A or B? Or will they point back to myself? I put the "iface clear" in ppp.linkup for exactly this case. > So really, you're doing the equivalent of ``disable iface-alias'' and > stopping your first connection from working. Moving the ``iface > clear'' to ppp.linkdown should be better. > > > Were my assumptions wrong (regarding the "iface clear" command) or is > > something > > broken in ppp? > > Yes and yes. Hmm, I didn't notice any problems before the last commit... Any automatic connection (even the first) worked without any problems. But: iface clear just went from ppp.linkdown to ppp.linkup some weeks ago, but after I got DSL. With DSL the destination IP address is always the same. I don't know if this configuration would work with my old ISDN access with changing destination IP addresses. [...] > > When IPCP comes up, ppp adds the new address to the interface. It's > *meant* to change the old interface destination address to > 255.255.255.255, but is getting this wrong. Then, as you've already > spotted, when your ``iface clear'' is run, it blows away the default > route. > > I've just committed a fix for this. It's in version 1.25 of iface.c. > > > BTW: If I disable IPv6 in the kernel, ppp won't start at all. It will spit out > > tons of messages > > Error: iface_Add: socket(): Protocol not supported > > Yep, a fix for that was committed a few days ago too. My apologies. Oh, I just discovered that cvsup didn't update my tree for 3 days. Everything works ok again - even the things which weren't design to work at all. -- Daniel To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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