Re: Load Balancer setting for Public Servers

Linux Advanced Routing and Traffic Control

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	Hello,

On Thu, 17 Feb 2005, Nguyen Dinh Nam wrote:

> Not enough, my tutorial only discuss about CONNMARK outgoing NEW packets
> in POSTROUTING, if you want to DNAT connections from internet to some
> computers in your LAN, you must also CONNMARK incoming NEW packets in
> PREROUTING too. I want to keep the tutorial short and simple so I don't
> write about it, you can consult CONNMARK in PREROUTING in RoutesKeeper's
> source code.
> Lacking CONNMARK in PREROUTING, some of your SYN/ACK packets may be
> DROPed by ISPs.

	That problem should be solved with the "routes" patch, may
be you know for some issue with this? First packet comes, DNAT selects
manipulations for both directions, packet is routed to internal host,
reply comes, we route by lsrc (maddr), one of the valid links for
maddr is selected, it can be different if routing allows input and
output routes to use diffrent interfaces (you don't know always the
incoming gateway that remote hosts are using to reach maddr). What
"routes" gives you is correct routing usage for NAT which is expected
from all NAT users in multipath setups.

>  From kernel 2.6.10, CONNMARK is included already, you don't have to
> patch anything.

	I'm happy with that, i just don't see the problems you see
with "routes".

Regards

--
Julian Anastasov <ja@xxxxxx>

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