docs/configuration/shared/udp-nat.md
!!! quote "Changes in sing-box 1.14.0"
:material-plus: [udp_mapping](#udp_mapping)
:material-plus: [udp_filtering](#udp_filtering)
:material-plus: [udp_nat_max](#udp_nat_max)
{
"udp_timeout": "5m",
"udp_mapping": "endpoint_independent",
"udp_filtering": "endpoint_independent",
"udp_nat_max": 0
}
UDP NAT expiration time.
5m will be used by default.
!!! question "Since sing-box 1.14.0"
UDP NAT mapping behavior.
| Value | Behavior |
|---|---|
endpoint_independent | Reuse the same mapping for the same source address and port for all destinations. |
address_dependent | Use a separate mapping for each destination address. |
address_and_port_dependent | Use a separate mapping for each destination address and port. |
endpoint_independent is used by default.
!!! question "Since sing-box 1.14.0"
UDP NAT filtering behavior.
| Value | Behavior |
|---|---|
endpoint_independent | Accept packets from any remote endpoint. |
address_dependent | Accept packets only from remote addresses to which packets have been sent. |
address_and_port_dependent | Accept packets only from remote addresses and ports to which packets have been sent. |
endpoint_independent is used by default.
!!! question "Since sing-box 1.14.0"
Maximum number of UDP NAT sessions.
When the limit is reached, the least recently used session is closed.
When unset or set to 0, 4096 is used on iOS. On other platforms, a value from 4096 to 16384 is selected based on total memory;
16384 is used if total memory cannot be detected.