07-25-2013
I suppose you need to use the right address, pre or post-NAT, not sure which, but if post-NAT, the NAT pool for that network needs to be distinct. I would expect IPtables to do NAT after filtering, but maybe it is up to you to order the rules right.
This option may only work on a filtering rule, not on a NAT rule, again not sure.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hello Guys,
I have a debian machine that work as a firewall (iptables + squid 2.6) with two physical interfaces: eth0 (public interface) and eth1 (internal interface LAN). I have created an alias eth1:1 in order to have two subnets on same physical interface:
cat/etc/network/interfaces
auto... (0 Replies)
Discussion started by: sincity2006
0 Replies
2. IP Networking
Hi Experts;
I want to find the right iptables commands combination to address the following need:
- NEs are NATed thru the linux box (using iptables) towards the WAN cloud, where the NTP servers are situated.
- In order to achieve redundancy, the NTP Servers are in a load balancing cluster... (0 Replies)
Discussion started by: lvl1s7a
0 Replies
3. Debian
Hello, the Nat and the forward worked on my debian server up to the reboot of machines.
The following rules*:
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth2 -d xxx.xxx.xxx.xxx --dport 29070 -j DNAT --to-destination 10.0.1.7:29070
/sbin/iptables -A FORWARD -p tcp -i eth2 -o eth0 -d... (0 Replies)
Discussion started by: titoms
0 Replies
4. IP Networking
Good morning,
I'm a newbie of iptables and as far as I've seen on tutorials on the Internet it seems that both prerouting and postrouting NAT chains are undergone both by a packet that goes from an internal LAN to the Internet and of a one that goes in the opposite direction (from the Internet to... (0 Replies)
Discussion started by: giac85
0 Replies
5. Red Hat
Hello, please can you help and explain me.
I have two servers. Both are RHEL6.
I use the first one like router and the second one for apache.
Router forwards 80 port on the second server and I can open that from the internet (mysite.com, for example). But I can not open mysite.com if i try to... (0 Replies)
Discussion started by: 6765656755
0 Replies
6. Cybersecurity
Hi, I am learning IPTables have this question.
My server is behind a firewall that does a PAT & NAT to the LAN address.
Internet IP: 68.1.1.23
Port: 10022
Server LAN IP: 10.1.1.23
port: 22
Allowed Internet IPs: 131.1.1.23, 132.1.1.23
I want to allow a set of IPs are to be able to... (1 Reply)
Discussion started by: capri_guy84
1 Replies
7. IP Networking
Hello,
Recently I discovered an issue with packet routing in the latest Android releases (4.4+ KitKat & Lollipop).
It seems that the problem Android specific, but essentially it comes from the Linux kernel.
I already filed a bug report to Google. You can see the details by searching for... (0 Replies)
Discussion started by: Vladislav
0 Replies
8. IP Networking
Hi guys
I'm running on debian on a small embedded system. I have a ppp interface that is connected to the internet (and works). My unit also has wifi access point (which works and I can connect to it).
I want to allow connections to the wifi to be able to use the internet from ppp0... (1 Reply)
Discussion started by: alirezan1
1 Replies
9. UNIX for Dummies Questions & Answers
OS version : RHEL 6.5
Below is an excerpt from /etc/security/limits.conf file for OS User named appusr in our server
appusr soft nproc 2047
appusr hard nproc 16384
What will happen if appusr has already spawned 2047 processes and wants to spawn 2048th process ?
I just want to know... (3 Replies)
Discussion started by: kraljic
3 Replies
10. Cybersecurity
good day good people
hi
first to tell that firewall and vpn is working as expected, but I notice something strange.
I have host system 11.11.11.11(local ip) firewall is blocking everything except port to vpn.
I have vpn on virtualized system 22.22.22.22 (CentOS both host and virtual). ... (0 Replies)
Discussion started by: end
0 Replies
ipnat(1M) ipnat(1M)
NAME
ipnat - user interface to the NAT subsystem
SYNOPSIS
ipnat [-dlhnrsvCF] -f filename
The ipnat utility opens a specified file (treating - as stdin) and parses it for a set of rules that are to be added or removed from the IP
NAT.
If there are no parsing problems, each rule processed by ipnat is added to the kernel's internal lists. Rules are appended to the internal
lists, matching the order in which they appear when given to ipnat.
ipnat's use is restricted through access to /dev/ipauth, /dev/ipl, and /dev/ipstate. The default permissions of these files require ipnat
to be run as root for all operations.
ipnat's use is restricted through access to /dev/ipnat. The default permissions of /dev/ipnat require ipnat to be run as root for all oper-
ations.
The following options are supported:
-C
Delete all entries in the current NAT rule listing (NAT rules).
-F
Delete all active entries in the current NAT translation table (currently active NAT mappings).
-d
Turn debug mode on. Causes a hex dump of filter rules to be generated as it processes each one.
-f filename
Parse specified file for rules to be added or removed from the IP NAT. filename can be stdin.
-h
Print number of hits for each MAP/Redirect filter.
-l
Show the list of current NAT table entry mappings.
-n
Prevents ipf from doing anything, such as making ioctl calls, which might alter the currently running kernel.
-s
Retrieve and display NAT statistics.
-r
Remove matching NAT rules rather than add them to the internal lists.
-v
Turn verbose mode on. Displays information relating to rule processing and active rules/table entries.
/dev/ipnat
Link to IP Filter pseudo device.
/dev/kmem
Special file that provides access to virtual address space.
/etc/ipf/ipnat.conf
Location of ipnat startup configuration file.
/usr/share/ipfilter/examples/
Contains numerous IP Filter examples.
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWipfu |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
ipf(1M), ipfstat(1M), ipnat(4), attributes(5)
To view license terms, attribution, and copyright for IP Filter, the default path is /usr/lib/ipf/IPFILTER.LICENCE. If the Solaris operat-
ing environment has been installed anywhere other than the default, modify the given path to access the file at the installed location.
25 Jul 2005 ipnat(1M)