this post was submitted on 04 Nov 2026
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Mostly to make the next sysadmin (or yourself in 6 months) weep. There's nothing preventing there being multiple IP subnets on a single network segment, but you'd usually handle that with separate VLANs, or at least an interface alias, so the machine saw both subnets. About the only reason I could see for just adding a static route would be if you're in the middle of reconfiguring your network to a new subnet but you still need the hosts you haven't updated to be able to route.
The real nightmare when someone puts two ip addresses on the same host through different interfaces. Now that makes for some confusing troubleshooting and explanations in various applications.
What really gets me is in about 3/4 networks in the last couple of weeks I've been asked to help troubleshoot, the problem has been duplicate IP addresses. I don't know what is going on with people...