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How to NAT and route with source and destination in packet

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http://serverfault.com – we currently have 2 old Linux servers running iptables that we're switching to a Cisco 2901 router. Since iptables and NAT on a Cisco device work differently, I'm not sure how to set up NAT on the Cisco device. We have a rule in iptables that translates and forwards a packet based on its source and destination address. I.E., the rule says target prot opt in out source destination DNAT tcp -- * * 210.x.y.237 210.z.a.131 tcp dpt:389 to:10.b.c.75:389 So if the packet comes in where the source is 210.x.y.237 and the destination is 210. (HowTos)

u85500's picture
Submitted by u85500 on 10/05/2012

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Configuring Source And Destination NAT With Firewall Builder

Firewall Builder is a firewall configuration and management GUI that supports configuring a wide range of firewalls from a single application. Supported firewalls include Linux iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many more.

Published at LXer:

Firewall Builder is a firewall configuration and management GUI that supports configuring a wide range of firewalls from a single application. Supported firewalls include Linux iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many more.

I have been trying to run open ssh server on ubuntu 9.10 (running on an iMac) so I can connect to it from my Windows Vista Laptop.

I have installed the openssh server. I went through the guide at https://help.ubuntu.com/community/SS...SH/Configuring

I already added a rule on nat table in /etc/ufw/before.rules :

*nat # masquerade rule for virtual box guests -A POSTROUTING -s 192.168.56.0/24 -j MASQUERADE COMMIT

after running:

root@parsoon:~# ufw disable && ufw enable root@parsoon:~# iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination

Chain INPUT (policy ACCEPT) target

Gcool wrote:Plain old iptables will do just fine.

Are these iptables rule normal 11 weeks 6 days ago

I have these iptables rule.

Hello. I'm brand new to Linux, but a long time Windows administrator, so I understand the concepts, not the syntax.

I've stumbled through setting up Ubuntu Server as a NAT server. It's working great now.

Is it possible to add a IPTABLES rule which allows all the protocols for specific source and destination ports? I tried the following but it didn't work.

iptables -I FORWARD 1 -s 172.27.0.254/255.255.255.255 -d 0.0.0.0/0.0.0.0 -p 0 --sport 0:65535 --dport 1191:1191 -j ACCEPT

iptables error: unknown option `--sport`

Any comments are greatly appreciated.

iptables blank after reboot 22 weeks 2 days ago

We've started encountering an issue with iptables on our RHEL 6.3 systems in that after a reboot, when the service starts, the rules are not loaded.