Created Known issues and solutions (markdown)

Known-issues-and-solutions.md

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+### Huge packet
+Some times you will get "Huge packet" warnings even if you have set MTU correctly everywhere. It might be caused by the GRO feature of network drivers, you can try to add the `--fix-gro` on both sides to fix it.
+
+Related issue:
+https://github.com/wangyu-/udp2raw-tunnel/issues/226
+
+### udp2raw server running with a common port (such as 443)
+
+If you run you udp2raw server on a common port such as 443, do not let udp2raw listen on `0.0.0.0`, let it listen on the specific IP instead.
+
+For example, change:
+```
+udp2raw -s -l0.0.0.0:443 -r127.0.0.1:1234      
+```
+to
+```
+udp2raw -s -l${your_server_ip}:443 -r127.0.0.1:1234      
+```
+Otherwise sometimes there will be some subtle problems hard to debug.
+
+Related issue:
+https://github.com/wangyu-/udp2raw-tunnel/issues/389