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comment GRE (IP protocol 47) NAT rules seem to expire
Thanks for the hint with checking the hit count. The result surprised me: there are no hits on the postrouting rule, and there are many packets matching the prerouting rules. Next step will be to investigate which drop or reject rule increases the number of hits when the tunnel is not functioning. I will post results in a few days.
Aug
13
comment GRE (IP protocol 47) NAT rules seem to expire
This must be it. As you said, ping does fix the problem. Does this mean that the first rule is useless, and packets coming from the internet are forwarded based on the firewall memory tables?
Aug
13
comment GRE (IP protocol 47) NAT rules seem to expire
The IP is static :(
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asked GRE (IP protocol 47) NAT rules seem to expire
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accepted NAT GRE (IP protocol 47) over Linux router
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comment NAT GRE (IP protocol 47) over Linux router
I had to leave the city, so I could not test this. But next week I will test what you said and give feedback. Please don't consider I forgot to accept a valid answer.
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asked NAT GRE (IP protocol 47) over Linux router