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In tunneling, how destination routers identify if a packet is encapsulated?

Encapsulation requires a protocol. Depending on the protocol, an encapsulating packet is uniquely identified by either EtherType (in layer 2), IP protocol number (in layer 3), transport-layer port ...
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MTU/MSS Oddness?

REALLY REALLY late update, but I got busy with other tasks (MS365 migrations, recent software vulnerabilities, etc.), so whoops that i left this unsolved. The MTU information helped guide us down a ...
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In tunneling, how destination routers identify if a packet is encapsulated?

I can't say that this applies to every tunnel imaginable, but this is a general idea how this could work. A tunnel is set up between an entry point and an exit point. In this case the outer packet ...
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Site-to-Site VPN with Sophos XG using tunnel interface

Solved. The Sophos Base license (includes S2S-VPN functionality) has been temporarily suspended. Now everything works as expected.
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Site-to-Site VPN with Sophos XG using tunnel interface

Site B is missing the route for 192.168.198.0/24 pointing into the tunnel. Without it, the packet leaks out to WAN. You need to either set up a static route or configure OSPF between the firewalls (...
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In PPTP, do encapsulated packets get further encapsulated in Ethernet frames?

do encapsulated packets get further encapsulated in Ethernet frames? PPTP sits on top of a transport-layer connection, using TCP. As such, PPTP frames are encapsulated in TCP segments, those are ...
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