IPSEC ALG
Hi,
ER7212PC Microsoft VPN L2TP to external server is working unstable. Ipsec ALG is enabled, but clients are thrown out of the tunnel after a few minutes...
Are there any solutions??
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@Jugend Can you please elaborate? Are you using the ER7212PC as the VPN server or a VPN client?
If you can share any additional configuration settings you have in place that would be great.
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I was lucky and I found the reason - if two clients behind the router connect to the same public IP address where there are L2TP servers on the internet. The previous one is thrown out. The clients are behind the TP-LINK router. It seems wrong that this is happening....
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@Jugend That sounds like a configuration issue on the L2TP server end, not the router. Is it possible that there are rules on the L2TP server that prevent multiple devices from the same public IP?
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No, it seems the problem is in the IPSEC ALG module. There are collisions there when two clients behind a TP-LINK router connect to the same L2TP server. I disabled one and everything works.
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In the router, you only need to turn on or off IPSEC ALG. If IPSEC ALG is not turned on. Clients cannot connect to L2TP at all..... Configuration for the router is simple and without any additional firewall rules.
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It's probably not a router problem...
When Device 1 is connected and Device 2 tries to connect, Device 1 gets disconnected. I’ve read in the forum that this is a limitation of L2TP and the VPN server’s inability to recognize which client to respond to.... Sadly.... But at least some clarity!
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