How Expensive?

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Hi Everyone,

I wish to use iptables on a host that will be hosting a large number of VMs for customers. IPtables will do some basic "managed firewalling" for them.

My question is, how expensive are having lots of custom chains? My idea is to create one child chain per VM, with the idea to cut down the amount of rules evaluated (i.e. a parent chain would only jump to a child chain if the dest IP matches) - does this sound like a good idea?

Thanks
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