Date: Fri, 7 Dec 2001 12:07:42 -0500 From: Steve Ames <steve@virtual-voodoo.com> To: Lars Eggert <larse@ISI.EDU> Cc: Anders Hagman <anders.hagman@netplex.se>, freebsd-hackers@FreeBSD.ORG Subject: Re: Nat through two DSL Message-ID: <20011207170742.GB80922@virtual-voodoo.com> In-Reply-To: <3C10F658.6070001@isi.edu> References: <5.0.2.1.0.20011207131945.009fe1d0@mail.training.telia.se> <3C10F658.6070001@isi.edu>
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On Fri, Dec 07, 2001 at 09:03:20AM -0800, Lars Eggert wrote: > Anders Hagman wrote: > > >I want to load share between two ADSL modems using a NAT/Firewall. > > > >Computer 1 \ > > \ /-- ADSL 1 > > \ / > >Computer 2 ------ Wireless LAN --- Firewall/NAT - > > . / \ > > . / \-- ADSL 2 > >Computer 10/ > > > >The ADSL are 500k links and I want to load share on session by session. > >Can I do NAT between an inside interface and two outside interfaces > >acting in a round robin fashion? > > This may not be the good idea you'd think on first glance. If one of the > paths has a slightly different RTT (and they're pretty much guaranteed > to), you'll see out-of-order delivery at the receiver. I remember seeing > some study that showed that TCP doesn't react too nicely under such > conditions (it works, but not at peak performance). Is it even possible to do use two upstream paths for redundancy? I tried (very briefly while I had two broadband connections while switching from one to the other) to get that to work and wasn't very successful. -Steve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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