Re: Asymmetric routing and IDS correlation ?

[Rich Adamson <radamson () routers com>]

> , and the routing and loadsharing is such that inbound traffic takes
> the left-hand link and outbound the right-hand, then neither of the
> two instances of snort on the snorthost will get enough information
> to do even minimal correlations, let alone use "flow" and "session"
> keywords.
>
> We know we could make the two links preferred/backup, rather than 
> equal-value loadshare, but that throws away half our bandwidth.

Take a look at your router config options, some offer "per-session"
load balancing as opposed to per-packet. That should take care of the
problem.

Rich




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