Torrent clients bring pf-based firewall to its knees...?
Peter C. Lai
peter at simons-rock.edu
Fri Jul 24 21:18:15 UTC 2009
If only a reboot solves the problem sounds like a kernel problem?
On 2009-07-24 04:56:11PM -0400, Mike Edenfield wrote:
> I've recently begun running a torrent client after hours on a PC sitting
> behind our firewall (7.2-STABLE using pf). I have added a 'rdr' rule to
> redirect incoming traffic to the client PC from the firewall, and as far as
> the client is concerned everything is fine.
> However, after a short period of torrent activity, the machine running the
> firewall becomes extremely slow and lagged for all network traffic, but
> appears to be operating fine locally. Remote connections via ssh become
> extremely unresponsive, and eventually connections start timing out, but
> when logged in at the console, there doesn't appear to be any problem.
> Running tcpdump does not show nusually high volume of traffic, no more than
> I see during normal activity during the day. The volume and length of
> connections doesn't seem to matter much -- trying to copy a BSD or Linux
> DVD with hundreds of connections breaks just as quickly as much smaller
> torrents with a handful of peers.
> I know there are some cheap NAT-ing routers that get in trouble with
> torrents because of the heavy volume of state rules required, but I've
> never heard of anything like that being present in pf. And I've used
> torrent clients at home behind a pf firewall with no issues, but not on
> this specific version of the FreeBSD.
> I've tried shutting down the torrent client, clearing out the state and nat
> rules with pfctl, adding drop rules to reject the torrent traffic, and even
> bringing the network adapter down completely, but only a physical reboot
> (combined with not running the client ever again) seems to solve anything.
> Has anyone experienced this kind of problem before? Or alternatively, is
> there some way besides tcpdump and top (neither of which show anything
> unusual) that I can tell what exactly the machine is doing that's causing
> the network lag?
> freebsd-stable at freebsd.org mailing list
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
Peter C. Lai | Bard College at Simon's Rock
Systems Administrator | 84 Alford Rd.
Information Technology Svcs. | Gt. Barrington, MA 01230 USA
peter AT simons-rock.edu | (413) 528-7428
More information about the freebsd-stable