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connect through firewall (no port forwarding) #16

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opened 2020-03-27 12:51:39 -04:00 by YoSev · 2 comments
YoSev commented 2020-03-27 12:51:39 -04:00 (Migrated from github.com)
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Hey,

can two servers connect to each other, if server 1 can contact server 2 but not the other way around due to firewall restrictions / missing port forwarding?

As Server 1 connects to Server 2, Server 2 should not need to connect to Server 1 anymore right (even tho it can't)?

I tried to set it up but i failed. No connection established between both hosts.

Hey, can two servers connect to each other, if server 1 can contact server 2 but not the other way around due to firewall restrictions / missing port forwarding? As Server 1 connects to Server 2, Server 2 should not need to connect to Server 1 anymore right (even tho it can't)? I tried to set it up but i failed. No connection established between both hosts.
kanocz commented 2020-03-31 06:29:12 -04:00 (Migrated from github.com)
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hi @john-dev , problem is that lcvpn doesn't use "connection" - it sends packets via UDP and assumes that both servers use "white ip" or in worst case have forwarded port
there are many other "connection-based" solutions exists and can be used (like openvpn, wireguard and so on) in your case - adding NAT support and so on will increase code-base more twice and it will be much more hard to check and analyze :(

hi @john-dev , problem is that lcvpn doesn't use "connection" - it sends packets via UDP and assumes that both servers use "white ip" or in worst case have forwarded port there are many other "connection-based" solutions exists and can be used (like openvpn, wireguard and so on) in your case - adding NAT support and so on will increase code-base more twice and it will be much more hard to check and analyze :(
YoSev commented 2020-03-31 07:02:44 -04:00 (Migrated from github.com)
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I see.. I assumed the UDP would use a kind of conenction state like TCP does too.
UDP Holepunching would be appreciated but i saw there is already a ticket.

I have to think this over, maybe tcp would be the better approach for me in thise case. Anyway, i love your project.

I see.. I assumed the UDP would use a kind of conenction state like TCP does too. UDP Holepunching would be appreciated but i saw there is already a ticket. I have to think this over, maybe tcp would be the better approach for me in thise case. Anyway, i love your project.
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kanocz/lcvpn#16
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