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15

It wraps around going to 0. According to RFC 793: It is essential to remember that the actual sequence number space is finite, though very large. This space ranges from 0 to 2**32 - 1. Since the space is finite, all arithmetic dealing with sequence numbers must be performed modulo 2**32. This unsigned arithmetic ...


13

Does the sequence number wrap around and become 0? Yes. All the details can be found in the TCP Specification RFC 793 - Transmission Control Protocol. Sequence Numbers It is essential to remember that the actual sequence number space is finite, though very large. This space ranges from 0 to 232 - 1. Since the space is finite, all arithmetic ...


7

Yes, it does wrap around. You can read it on Wikipedia or on RFC1323, which shows how to protect against wrapped sequence numbers. Let me quote: TCP timestamps are used in an algorithm known as Protection Against Wrapped Sequence numbers, or PAWS (see RFC 1323 for details). PAWS is used when the receive window crosses the sequence number wraparound ...


1

Here is one option that you might not have looked into. You can use a Serial over IP Adapter and then connect to the that device over your network. We use several of these to talk to PLCs and our phone systems. Another one here states the Virtual COM software supports linux. Where it will map a virtual COM device to the remote serial port.


1

These particular symptoms (with a VPN) are fairly common symptoms indicating an issue with your path MTU. MTU basics The path MTU (Maximum transmission unit) is the largest packet that can traverse between two devices on the internet (or any other network). Each link along the path has its own MTU, which may or may not match the others. The overall path ...


1

Destination unreachable is generated by the host or its inbound gateway to inform the client that the destination is unreachable for some reason. A Destination Unreachable message may be generated as a result of a TCP, UDP or another ICMP transmission. Unreachable TCP ports notably respond with TCP RST rather than a Destination Unreachable type ...



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