Yuri,
> NAT44 does not use all addresses uniformly
The address and port allocation algorithm is plugable.
Contributions to alternative/better algorithms would be very welcomed!
Best regards,
Ole
>
> Hi,
>
> I use nat output address space:
> nat44 add address 19.246.159.5 - 19.246.159.100
>
> Configuration:
> nat {
> translation hash buckets 1048576
> translation hash memory 268435456
> user hash buckets 250
> max translations per user 20000
> }
>
> Looks like external address is changing only when all port become busy:
> vpp# show nat44 sessions
> NAT44 sessions:
> -------- thread 0 vpp_main: 292204 sessions --------
> ...
>
> vpp# show nat44 addresses
> NAT44 pool addresses:
> 19.246.159.5
> tenant VRF independent
> 0 busy udp ports
> 0 busy tcp ports
> 0 busy icmp ports
> ...all others shows 0 busy ports
> 19.246.159.95
> tenant VRF independent
> 0 busy udp ports
> 0 busy tcp ports
> 0 busy icmp ports
> 19.246.159.96
> tenant VRF independent
> 0 busy udp ports
> 17804 busy tcp ports
> 0 busy icmp ports
> 19.246.159.97
> tenant VRF independent
> 0 busy udp ports
> 64511 busy tcp ports
> 0 busy icmp ports
> 19.246.159.98
> tenant VRF independent
> 0 busy udp ports
> 64511 busy tcp ports
> 0 busy icmp ports
> 19.246.159.99
> tenant VRF independent
> 0 busy udp ports
> 64511 busy tcp ports
> 0 busy icmp ports
> 19.246.159.100
> tenant VRF independent
> 16143 busy udp ports
> 64511 busy tcp ports
> 213 busy icmp ports
> NAT44 twice-nat pool addresses:
> vpp#
>
> Is there method to make more uniform use of all output addresses?
>
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