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21 views

Simple MASQUERADE NAT between 2 VM

I'm on a cloud service and I'm trying to set up NAT between two VM. I've never experienced issues in this simple step, but this time is different and I'm near to give up. The first VM had two ...
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0answers
38 views

NAT answers instead of remote host

Currently I have VPN client access set up on OpenSuSE 13.1 server to third-party remote Cisco VPN IPSec server. VPN Server is set up to provide access for a host only and to provide access for a local ...
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0answers
29 views

Postfix on Linux: easy way of masquerade_exceptions=<all system users>?

... well, the subject says it: in a NULLCLIENT configuration, we want to have all normal users to be masqueraded, but all system users should be exposed. The sysadmins get system user's mails from a ...
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0answers
14 views

Impact of iodined settings to server

I would like to install iodined, the IP tunnel via DNS, on a working web server. However, the configuration requires to set IP forwarding add NAT masquerading rules to iptables (and open DNS port) ...
0
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1answer
83 views

Send an email from exim to another SMTP server strippping the local envelope

I manage a service that recently switched to AWS/EC2 but we have several IP addresses with great email reputation that we'd like to keep sending the email through. We've set up exim to be a satellite ...
0
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1answer
98 views

Network remapping with iptables and PPTP VPN

I have two different networks: Home network 192.168.1.0/24 A - Home PC (192.168.1.100) B - Home Router (192.168.1.1 lan ip - x.x.x.x public ip) Office network 192.168.1.0/24 C - File Server ...
1
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0answers
39 views

OpenVPN running on Internet Gateway, so all private clients can access VPN with no config

Our LAN connects to our office gateway machine (192.168.1.1), which is connected to the Internet. I have setup NAT/Masquerading for this purpose with no issue. We also use OpenVPN to connect to our ...
4
votes
3answers
166 views

route cache filling with wrong entries

I have an issue with private network traffic not being masqueraded in very specific circumstances. The network is a group of VMware guests using the 10.1.0.0/18 network. The problematic host is ...
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2answers
118 views

Iptables MASQUERADE: What is the advantage/disadvantage between these two commands? [closed]

What is the advantage/disadvantage between below 2 commands: iptables -t nat -A POSTROUTING -o eth0 -s 10.0.0.0/16 -j MASQUERADE AND iptables -t nat -A POSTROUTING -j MASQUERADE Some Background ...
0
votes
3answers
170 views

CentOS masqueraded network with iptables clients not connecting: Unable to ping

I'm a novice sysadmin working on a system with a CentOS server masquerading traffic with client machines also running CentOS. Something with the tables got messed up and my clients no longer have ...
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3answers
945 views

Almost working: How to set up iptables and iproute2 rules on dual WAN linux server?

I have a Raspberry Pi (running Raspbian) with three network interfaces (one ethernet and two USB wifi nics). What I want to achieve is this: I have two WAN connections to the internet (DSL + Cable), ...
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0answers
32 views

Webserver with two seperate connections without masquerading?

I've got a QNAP x86 NAS with 2 GBit-LAN interfaces running an Apache Webserver. I've also got two seperate internet connections with two seperate public ip's that have two seperate dns-entries. As ...
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votes
0answers
103 views

NAT (MASQ) with vpnc daemon

I'm just setup vpnc daemon and setup tunnel, interface is up everything is OK. I'm try to share this tunnel for LAN using two files for iptables MASQ. First for starting up: cat ...
0
votes
1answer
27 views

Postfix mail server taken over by spammers following update of environment despte countermeasures

Long configured, stable Postfix mail server on internal system with greylisting, a long list of restrictions and real-time black-listing, reachable through a gateway / firewall via forwarded port ...
0
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1answer
114 views

firewalld: trouble forwarding port 25 while other ports forward just fine, “rich rule” logging shows NO entries

So, I installed Fedora Core 19 for the first time as a replacement for an older system whose disk had finally died. The system serves as a web server and gateway / firewall, protecting internal ...
1
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0answers
50 views

what is PAT exactly?

In attempt to understand PAT, I've setup the following setup where I have a Linux Router that masquerades from in internal interface to the external. Thus both clients are able to talk to outside ...
0
votes
1answer
109 views

It is okay to set MASQUERADE at 2 network interfaces in a Linux server?

There is a Linux server with 3 network interfaces, eth0, eth1, eth2. IP forwarding has been turn on in this server. eth0 is connected to 10.0.1.0/24. Its IP is 10.0.1.1. eth1 is connected to ...
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2answers
287 views

limit ip Masquerade to certain ip range

I'm using the entire 10.0.0.0/8 subnet on the private side. I want to allow a certain section of the subnet (say 10.0.0.2 - 10.0.31.254) to access the internet via linux router but not the rest of ...
1
vote
0answers
65 views

Pass / forward 8080 port on server with masquerade

There is server machine wich is connected to ISP only with modem, no router. Server got apache on 80port. Now on other ethernet card in my server i have cable going to my router, router serve ...
0
votes
1answer
191 views

How to configure iptables rules for connecting 2 eth to the net (forwarding & masquerading)

need some help on configuring iptables rule for forwarding and masquerading Given I have these configuration: switch1 ---- (eth1) ----- router ---- (eth2) ----- switch2 ...
0
votes
1answer
191 views

Intermittent access to HTTPS sites through iptables MASQUERADING

The problem: everything is fine on the network, except every once in a while, all https times out for all the hosts on the network. After a few minutes it goes back to being near-instant for several ...
0
votes
1answer
130 views

Configure IPTABLES to MASQUERADE traffic from a single host in lan and block other

Have a proxy server with squid installed. Want to configure iptables so as to allow a single ip in lan to access internet directly without directing the traffic through squid. the following works to ...
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votes
2answers
476 views

Confusion Post FedoraCore Upgrade: NAT / port forwarding trouble, and POSTROUTING MASQUERADE has unexpected influence on forwarding ports

Following a gateway / firewall system's hardware failure, a younger version of Fedora Core (17) was installed on new hardware, and the old 'iptables' and system-config-firewall files from ...