| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | This target is only valid in the |
| 2 | .B nat |
| 3 | table, in the |
| 4 | .B POSTROUTING |
| 5 | chain. It should only be used with dynamically assigned IP (dialup) |
| 6 | connections: if you have a static IP address, you should use the SNAT |
| 7 | target. Masquerading is equivalent to specifying a mapping to the IP |
| 8 | address of the interface the packet is going out, but also has the |
| 9 | effect that connections are |
| 10 | .I forgotten |
| 11 | when the interface goes down. This is the correct behavior when the |
| 12 | next dialup is unlikely to have the same interface address (and hence |
| 13 | any established connections are lost anyway). It takes one option: |
| 14 | .TP |
| 15 | \fB\-\-to\-ports\fP \fIport\fP[\fB\-\fP\fIport\fP] |
| 16 | This specifies a range of source ports to use, overriding the default |
| 17 | .B SNAT |
| 18 | source port-selection heuristics (see above). This is only valid |
| 19 | if the rule also specifies |
| 20 | \fB\-p tcp\fP |
| 21 | or |
| 22 | \fB\-p udp\fP. |
| 23 | .TP |
| 24 | \fB\-\-random\fP |
| 25 | Randomize source port mapping |
| 26 | If option |
| 27 | \fB\-\-random\fP |
| 28 | is used then port mapping will be randomized (kernel >= 2.6.21). |
| 29 | .RS |
| 30 | .PP |