4 ms·
Why not? I regularly use 5-digit ports - 3-digit prefix plus 2-digit 'official' port - for various systems which reside behind a NATting router.
by Yetanfou 7y ago
Why not? I regularly use 5-digit ports - 3-digit prefix plus 2-digit 'official' port - for various systems which reside behind a NATting router.
- the_mitsuhiko 7y agoI'm pretty sure it's generally not advisable to use ports this high since they are used for other purposes.
- Avamander 7y agoAll purposes are equally as valid on unallocated port ranges. Inconfigurable port ranges with no fallback when those ports are in use is bad design.
- user5994461 7y agoHigh port numbers, above 30000 usually, are ephemeral ports and get pre-empted by the system. They're not safe to listen to for server applications.
- syncsynchalt 7y agoPorts <1024 require root access to bind, so on a multi-user system it would be insecure to run ssh on such a high port. (Granted, multi-user hosts are very rare nowadays).