Date: Thu, 5 Oct 2006 10:02:10 -0400 (EDT) From: "Dominic Blais" <dblais@interplex.ca> To: freebsd-isp@freebsd.org Subject: Linksys BEFSR41 v4.0 cause big troubles with ppp(oe) Message-ID: <1683.205.237.37.179.1160056930.squirrel@secure.interplex.ca>
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Hi! Since some times, we noticed that one of our pppoe server running FreeBSD had multiples tun interfaces stuck with a never stoping ppp process. The logs clearly shows the user is logging on a new session with with the same router... We ensured it's not a script kiddy trying to suck some ip addresses. Then we tried to figure out what's the link with these users and we found it was their router. In fact, the Linksys BEFSR41 ver. 4 (maybe others too) makes the ppp process kinda freeze and lock a tun interface with it's IP address until you kill the ppp process. Our ppp.conf file sets a max of 1472 for the mtu. Fortunately, we can find these locked interfaces by their MTU which is at 1500 and abnormal for our tun interfaces. For the moment we can only monitor it and tell our clients not to use this kind of router but we think FreeBSD's ppp should manage this threat and release the precious and limited ressource (IP addresses). Note that this problem can take some hours to show... To reproduce it, take a BEFSR41 router from Linksys, connect it to your FreeBSD server with pppoed and wait 12 hours. It can happen anytime from 5 seconds to 12 hours..but in 12 hours, it really should happen ;) Has anybody noticed this problem? We experienced it on release 5.x and 6.x. -- Dominic Blais Network Administrator Interplex Télécom Inc. http://www.interplex.ca
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