17
Port Forwarding/Redirecting
(lemmy.dbzer0.com)
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this post was submitted on 03 Sep 2024
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So, here's a page from the online manual that specifies how to do this specifically for the FritzBox 7530
https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-7530/893_Configuring-static-port-sharing-in-the-FRITZ-Box/
Based on the original post though I am 100% sure that OP has already seen this page, already tried it, and therefore knows that the warning under 2.10.b. applies to the OP's case (i.e. FritzBox doesn't allow it from UI because the ISP doesn't allow it - that honestly had me wondering just how the FritzBox knows the ISP doesn't allow it, but that's a different topic).
Because the Fritzbox uses a DS-Lite tunnel.
Thanks, that pointed me in the right direction!
If I'm understanding https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-3490/1611_What-is-DS-Lite-and-how-does-it-work/ and https://superuser.com/questions/1301857/using-pcp-port-control-protocol-in-practice correctly it seems that it's technically via PCP (Port Control Protocol) that this is known, rather than DS Lite per se, but also that PCP only comes into play here because DS Lite is being used.
(Why point out the distinction? For future readers. I can imagine some braindead ISP somewhere (likely a super cheap reseller) offering DS Lite but then not knowing about PCP, and either not offering port forwarding at all - or they do but you have to fill out a form and snail mail them and then they snail mail you back a printed letter containing a list of port mappings.)