On Mon, 31 Jan 2000, Michael Boman wrote:
> On Mon, Jan 31, 2000 at 12:17:57PM +0800, Ian C.Sison wrote:
> > On Mon, 31 Jan 2000, you wrote:
> > > Is there a way to do load-balancing between 2 leased lines? I guess it
> > > would be something like eql, but not quite that either.
> > >
> > > We have currently a 128k and 512k leased line, and to start with I want
> > > to route our internal->external traffic to the least busy ISP.
> > with the ip advanced router, and equal cost multipath and the iproute2 package,
> > you can set two default gateways with preference weights, and load balance the
> > two outgoing links.
> Will that interfer with the servers I have in my DMZ?
Depending on how you configure your network, and the routers.
> [ISP] [ISP]
> | |
> | |[DMZ]
> | +--+---+---+--+--+--+
> | | | | | | |
> [LAN] [B] [B] [B][B][B][B]
> R = Router (Intel / Cisco)
> B = Box, ie server
> Please advice
> Michael Boman
To what IP block do your servers/downstream clients belong to? For true load
balancing, you'ld have to use IP Masquerading on the gateway box with ECMP.
This is so that replies to outgoing requests come back in via the same link.
IP Masq isn't always pretty especially if you have downstream networks
requiring a direct connection to the internet, so it may be possible just to
load balance / masquerade certain types traffic, for instance web traffic, or
combining ipchains + iproute2 can accomplish this nicely.
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