You are probably looking for RFC 6056 – Recommendations for Transport-Protocol Port Randomization (“Best Current Practice”). Technically there is no requirement that the ephemeral port be >1024 or random (you could build a system that always initiates connections from port 12 because you like the number 12), it’s just not “normal” to do so (and … Read more
The /30 means all but two of the 32 bits are used to define the netmask. It also means you’ve got four IP addresses to play with. (But in reality, only two of which can be hosts) Your last octet of the netmask is (in binary) 11111100, which leaves the last two bits for you … Read more
UDP datagrams have little to do with the MTU size you can make them as big as you like up to the 64K is maximum mentioned above. You can even send one of them in an entire packet as long as you are using jumbo frames with a size larger the large datagram. However jumbo … Read more