Routers know how to figure out what route to use for a given IP.
If they apply this algorithm to the source IP and find that the optimal route to the source is a different interface than it was received on, that’d potentially be a red flag. But if the optimal route to the source is the same as the optimal route to the destination, that’d be a huge red flag.
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Routers know how to figure out what route to use for a given IP.
If they apply this algorithm to the source IP and find that the optimal route to the source is a different interface than it was received on, that’d potentially be a red flag. But if the optimal route to the source is the same as the optimal route to the destination, that’d be a huge red flag.
That really only works if you assume routing symmetry and a single optimal route.