How To Deal With Triangle Toute And Traffic Redirect - ZyXEL Communications P-791R V2 Support Notes

P-791R v2 Support Notes

18. How to deal with Triangle toute and Traffic redirect?

Traffic redirect scenario:
• Triangle route introduction
A traffic route is a path for sending or receiving date packets between two
Ethernet devices. Some companies have more than one alternate route to one
or more ISPs. If the LAN and ISP(s) are in the same subnet, the "triangle route"
problem may occur. The steps below describe the "triangle route" problem.
1. A computer on the LAN initiates a connection by sending out a SYN packet
to a receiving server on the WAN.
2. The P-791R v2 reroutes the SYN packet through Backup Gateway on the
LAN to the WAN.
3. The reply from WAN goes directly to the computer on the LAN without going
through the P-791R v2.
As a result, the P-791R v2 resets the connection, as the connection has not
been acknowledged.
"Triangle Route" Problem:
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