2 ms·

At some point you also need more IPv4-addresses. There are only 65535 ports to be mapped.

• zamadatix 4y ago
  At some point but remember it's not "after 65535 connections per IP" it's "after 65535 connections of the same type to the same IP per IP". That is to saythese NATs where 156.78.92.154 is a single public address on the NATing box: 156.78.92.154:6781<->8.8.8.8:53 UDP 156.78.92.154:6781<->8.8.8.8:53 TCP 156.78.92.154:6781<->8.8.4.4:53 TCP 156.78.92.154:6781<->8.8.4.4:53 UDP Can all exist simultaneously even though only 1 port is in use and we haven't even started changing the destination IP or ports yet (e.g. 80 and 443 as the destination won't double count and thousands of web servers on different addresses can be accessed via the same source port). With CG-NAT you can usually support somewhere around 30k customers on the free /24 you get from ARIN for having only IPv6 and needing space to translate in (for new orgs like new ISPs this is assigned immediately out of a reserved block, bypassing the waitlist for existing orgs trying to get free reclaimed space).