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Network packets travel through different waypoints from A to Z compared to packets traveling from Z to A.

Asymmetric Routing (ASR, also seen:"asymmetrical route") does typically happen in the internet and does not have to be a problem. Instead, it may be a manually configured - or most likely - automatic optimization.

In trivial local area networks (LANs) ASR is not to be expected, especially if a LAN does not have more than one gateway.

In complex LANs though ASR is possible. It may work fine, especially if packets only travel through routers but not through firewalls.

Typically firewalls expect to see the whole communication of each (e.g. TCP) connection passing through them but due to ASR they might only see packets in one direction.

A firewall may then supress all such communication as a security feature, by e.g. disconnecting such TCP connections.

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Q: What is asymmetric routing?
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