i have been told this is possible by someone who clearly has no idea how so i have not become aware how and am not even sure it can be done. i tried a few searches on google an duckduckgo but just get basic networking info. what i want to do is route by userid. that is, regardless of the destination IP, i want traffic to go by way of a specific gateway for a particular userid. i have about 5 VPNs running to various places and about 18 logged in userids and want specific userids to use a specific VPN. how would something like this be set up?

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looks like a viable way to do it. i hope those mark number numberspaces are really separate from each other. using the same number for both would be a confusing example. if the mark numbers can go as high as userid numbers, i'd just make everything the same (fwmark = tablenum = userid).