My server is behind a firewall that does a PAT & NAT to the LAN address.
I want to allow a set of IPs are to be able to SSH & DROP all other traffic. The question where I got confused is my destination address
Packet from computer on Internet:
Packet seen by server behind firewall:
Q1) Now, how do I write my IPtables ruleset, if the host is not able to see the actual source of the traffic?
Q2) I also want to block any SSH from within 10.0.0.0/subnet as it will be a colo facility & other servers share LAN addresses.
Greetings to all.
My new firewall is giving me one hell of a problem.
I'm running iptables and masquerading my intranet
thru NAT. But here is the problem. Whenever I try
to FTP to a server outside of my lan I get a 500
illegal port error.
I've come to the conclusion that NAT is... (2 Replies)
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)
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)
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)
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)
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)
Hi all,
I have a following situation:
- I want certain source IPs to be natted to a different destination IP and Port. Following is how I am achieving it:
/usr/local/sbin/iptables -t nat -A PREROUTING -p tcp -s 192.168.10.12
--dport 1500 -j DNAT --to-destination 192.168.10.20:2000
... (3 Replies)
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)
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)
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)