Subject: Re: IP distribution across multiple NICs
To: tester 777 <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 01/10/2001 07:10:28
In message <F71LuSbh29cM3oryKFR000072c2@hotmail.com>, "tester 777" writes:
>i'm hosting some heavily accessed content over a lan under netbsd1.5 i386.
>only about 60 megs of data so i've made it all memory resident to up
>peformance, but my nic is hitting its 11 to 12 megabyte/sec limit though the
>CPU isn't maxing out. i've heard of binding an ip to multiple mac addys
>before (at the OS level) but have no idea if and how this may be
>accomplished under netbsd. i don't have the need or net topo or money to
>dive into gigabit yet so i'm looking for a fast ethernet-based solution.
>ideally, i would hope to be able to distribute the load of a single IP
>across multiple nics. (i have 3 intelpro 100b already installed and
>configured with 3 ips [fxp0, 1, and 2 respectively]). i'm hoping for a
>solution that would symmetrically distribute load evenly between all
>installed nics so i might even maintain nice latency before i hit 300mbit in
>active load (obviously i would become CPU/bus limited long before this
If you're getting 12 megabyte/sec on a 100baseT LAN, you're doing very
well. What is downstream of that LAN? A switch? What is it connected
to? What is the output bandwidth there?
A common way to do load-balancing across multiple IP addresses is via
the DNS. For the specific solution you're asking for -- I don't know
how to do that on NetBSD, but that doesn't mean there isn't one. You
could probably play games with ARP, if you wished.