diff options
author | /C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=kaber/emailAddress=kaber@netfilter.org </C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=kaber/emailAddress=kaber@netfilter.org> | 2007-02-24 15:11:33 +0000 |
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committer | /C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=kaber/emailAddress=kaber@netfilter.org </C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=kaber/emailAddress=kaber@netfilter.org> | 2007-02-24 15:11:33 +0000 |
commit | 1905e3521e8401ad2ef912263265596d43e06a3c (patch) | |
tree | 206f258318c77aefd215255edfc680f39311dc6d /extensions/libipt_SNAT.man | |
parent | 6ef120e980e3e44bab704a01414a2ebec1c4c481 (diff) |
iptables: add random option to SNAT (Eric Leblond)
Diffstat (limited to 'extensions/libipt_SNAT.man')
-rw-r--r-- | extensions/libipt_SNAT.man | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/extensions/libipt_SNAT.man b/extensions/libipt_SNAT.man index 2d9427f..daef78f 100644 --- a/extensions/libipt_SNAT.man +++ b/extensions/libipt_SNAT.man @@ -7,7 +7,7 @@ modified (and all future packets in this connection will also be mangled), and rules should cease being examined. It takes one type of option: .TP -.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]" +.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]" [ "--random" ] which can specify a single new source IP address, an inclusive range of IP addresses, and optionally, a port range (which is only valid if the rule also specifies @@ -17,7 +17,10 @@ or If no port range is specified, then source ports below 512 will be mapped to other ports below 512: those between 512 and 1023 inclusive will be mapped to ports below 1024, and other ports will be mapped to -1024 or above. Where possible, no port alteration will occur. +1024 or above. Where possible, no port alteration will If option +.B "--random" +is used then port mapping will be forcely randomized to avoid +attacks based on port prediction (kernel >= 2.6.21). .RS .PP In Kernels up to 2.6.10, you can add several --to-source options. For those |