diff options
Diffstat (limited to 'extensions/libxt_DNAT.man')
| -rw-r--r-- | extensions/libxt_DNAT.man | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/extensions/libxt_DNAT.man b/extensions/libxt_DNAT.man index 225274ff..090ecb42 100644 --- a/extensions/libxt_DNAT.man +++ b/extensions/libxt_DNAT.man @@ -10,7 +10,7 @@ should be modified (and all future packets in this connection will also be mangled), and rules should cease being examined. It takes the following options: .TP -\fB\-\-to\-destination\fP [\fIipaddr\fP[\fB\-\fP\fIipaddr\fP]][\fB:\fP\fIport\fP[\fB\-\fP\fIport\fP]] +\fB\-\-to\-destination\fP [\fIipaddr\fP[\fB\-\fP\fIipaddr\fP]][\fB:\fP\fIport\fP[\fB\-\fP\fIport\fP[\fB/\fIbaseport\fP]]] which can specify a single new destination IP address, an inclusive range of IP addresses. Optionally a port range, if the rule also specifies one of the following protocols: @@ -18,17 +18,14 @@ if the rule also specifies one of the following protocols: If no port range is specified, then the destination port will never be modified. If no IP address is specified then only the destination port will be modified. -In Kernels up to 2.6.10 you can add several \-\-to\-destination options. For -those kernels, if you specify more than one destination address, either via an -address range or multiple \-\-to\-destination options, a simple round-robin (one -after another in cycle) load balancing takes place between these addresses. -Later Kernels (>= 2.6.11-rc1) don't have the ability to NAT to multiple ranges -anymore. +If \fBbaseport\fP is given, the difference of the original destination port and +its value is used as offset into the mapping port range. This allows one to create +shifted portmap ranges and is available since kernel version 4.18. +For a single port or \fIbaseport\fP, a service name as listed in +\fB/etc/services\fP may be used. .TP \fB\-\-random\fP -If option -\fB\-\-random\fP -is used then port mapping will be randomized (kernel >= 2.6.22). +Randomize source port mapping (kernel >= 2.6.22). .TP \fB\-\-persistent\fP Gives a client the same source-/destination-address for each connection. |