-2
votes
1answer
60 views

One Public IP, Private IPs, DNS Server and Multiple Servers [closed]

I have lots of unanswered questions about these topics. So, lets begin. First off all, I'm not a server and networking guru. I'm a regular PHP developer. And I've read allmost all of the articles ...
0
votes
0answers
31 views

Load balancing Bind9 with Keepalived and LVS

How can I correctly configure LVS to masqerade/NAT packets from virtual ip to/from clients? Currently I have: UDP 10.47.1.80:domain rr -> 10.47.1.51:domain Masq 10 0 ...
0
votes
3answers
122 views

Do I need public DNS records for the external IPs of our workstation NAT?

We have certain stakeholders who believe that the public IPs used by our workstations should have globally available DNS records, and that not having dns records would break some internet services. ...
1
vote
1answer
91 views

Iptables prerouting based on destination's DNS name?

I've got a question concerning iptable prerouting. I'm not that familiar with networking/routing/iptables so I hope this is not a stupid question, at all. So I ask for your understanding and ...
0
votes
1answer
90 views

can I use DNS with private NAT addresses?

I want to build a service that dynamically creates VMs and assigns each VM a public DNS record which could be a full domain or a subdomain. Assume the VMS all live on a single host. The VMs will have ...
1
vote
1answer
86 views

Redirect traffic from one server to something.cloudapp.net (CNAME) [closed]

Through out North America, we have lots of legacy devices, which sends data to our server which has static IP Address. Now we are moving to Azure cloud services, and as you know they do not guarantee ...
0
votes
0answers
25 views

Is it possible to hairpin on Cisco 851W IOS 12.4(15)T9 and how?

I need machines on the LAN to be able to access by the external address or hostname. If it can't be done, then just by hostname is OK as well, so I thought of just doing it through DNS on our internal ...
0
votes
0answers
32 views

making a software router for my private network [duplicate]

give me suggestion on this problem. I have 2 nic cards public ip (eth1) and private ip (eth2). now i have a linux system having centos 6.4. I made this system software router so can access internet on ...
-1
votes
1answer
233 views

How to configure dns in centos to resolve internal lan ip [closed]

i have a router with nat to web server inside LAN. Also i have internal DNS server on centos. When i try to access web server from internet it works fine, but when i try to access from the LAN, DNS ...
0
votes
3answers
564 views

want to Make software router having two nic cards using centos 6.4

I'm new on CentOS. I have a CentOS 6.4 system having 2 NIC cards. I want to setup a gateway so I can get internet from public ip over 1st nic card (eth1) and forward the network over 2nd nic card ...
0
votes
1answer
348 views

Use External DNS Record local with additional subdomains

We have a server in our LAN which is locally available at a fixed ip. We now have a DDNS Service and a port forwarding rule to make the server available from outside. Additional we added subdomain at ...
10
votes
3answers
3k views

Exposing multiple servers behind NAT using a single public IP address

This is a Canonical Question about NAT and DNS I'm currently trying to set up a network with a DMZ containing a web server and an e-mail server separated from the Internet by a network address ...
-1
votes
3answers
68 views

Set static IP to a server behind the NAT [closed]

In my company, we just bought a server and now we want to set a static IP to it. Well, I've contacted my ISP and they said that they can give me static IP. So far, so good. My question is, where ...
1
vote
2answers
94 views

webserver unreachable for short periods

We have a development webserver (ubuntu) with some websites running on it. Most of the time this works fine but since some time when we are developing we get a "cannot connect" error when loading a ...
1
vote
0answers
310 views

How does one configure UFW to allow private DNS requests, but block DNS requests from internet

I have an Ubuntu Server 12.04, with two network cards: eth0 is connected to the internet eth1 is connected to a private network (192.168.10.1) The server is configured as a gateway and hosts DNS ...
5
votes
1answer
109 views

Running multiple services on different servers with IPv6 and a FQDN

One of the things NAT has permitted us to do in the past decade is split physical services onto different servers whilst hiding behind a single interface. For example, I have example.com behind a NAT ...
0
votes
2answers
396 views

Where to start for setting up hostname NAT behind one external IP address?

Not sure I use the right terms here, which is basically why I am asking (with the right terms I could google it for sure). I have "one big server" with Windows 2008, with several virtual machines ...
3
votes
1answer
3k views

DNS Server Behind NAT

I've got a Bind 9 DNS server sitting behind a NAT firewall, assume the Internet facing IP is 1.2.3.4 There are no restrictions on outgoing traffic, and port 53 (TCP/UDP) is forwarded from 1.2.3.4 to ...
1
vote
3answers
1k views

How to configure bind for a private subdomain?

I am attempting to define a subdomain for a private network (RFC1918) behind a NAT firewall; let's call it priv.example.com. Normally, and from what I can gather on various websites, this could be ...
3
votes
1answer
684 views

Dynamic DNS with split horizon DNS or hairpin NAT

I would like to host a CalDAV and CardDAV server for devices that will roam between being on the LAN to outside my network (such as my iPhone and laptops). A static IP is prohibitively expensive. I ...
0
votes
1answer
3k views

Windows Server 2008 R2 drops packets

I seem to be having strange problems with my WS2008R2 Active Directory + DNS + DHCP + NAT configuration. It look to be some sort of an issue between DNS, NAT and LDAP. The first consequence is some ...
1
vote
1answer
120 views

Multiple Servers, externally, through single IP

Let's say, I have a server which is directly connected to the internet (no firewall), and sits on 66.77.88.99 externally and internally sits on 192.168.0.1. I have my domain's records set up so that ...
1
vote
1answer
1k views

Adding multiple A records for same host for backup purpose

I have a webserver. I have 2 static IP's from 2 different ISP's. I want to make sure my webserver is accessible when one ISP's network(s) are down. for example my host name a.example.com my ISP1 IP ...
0
votes
2answers
250 views

webserver from local network (behind NAT)

I have a debian server (gateway, web) which is behind ISP's NAT. I need access on webserver from my local network but domain has DNS record for external IP. Can I create "fake dns" for my local ...
0
votes
3answers
4k views

Redirecting DNS port to a specific DNS server

I use a ubuntu server as a router for my users on a NAT network. I want to force all users to use a local dns server setup on the network. Even if they use a public DNS server in their client ...
0
votes
1answer
833 views

iptables masquerading / NAT firewall works with IPs, FAILS on SOME connections, esp when Domain Names are involved

Problem Description: One of two gateway ("firewall") systems failed, so I generated an "identical" one on replacement hardware, and found that when I switched one of the internal machines to go ...
1
vote
2answers
707 views

How to disable dns doctoring for IPSEC VPN connections for ASA 5510

*Update, turns out that adding additional nat exclusions stopped dns doctoring from being triggered, resolving the problem. So I have one last outstanding issue with our vpn setup to our office. I ...
1
vote
1answer
191 views

Set up multiple servers behind a NAT

I am currently trying to set up a network with both a secure webserver and an internal openvpn server. The webserver is running windows 2008 and the vpn network is running the Access server from ...
0
votes
1answer
56 views

Mail not sending on Server 2008 using NAT between 2 NIC's

I recently moved from a svr2003 domain to a new 2008 domain. The setup I had below allowed internet and also smtp configured in outlook to go via 192.168.1.1 nic 1 192.168.1 - wan sn 255.255.255.0 ...
4
votes
2answers
2k views

NAT Reflection, or Split DNS?

I'm working on a network restructure that has three geographical locations, but will share some services. Two of the locations have workstations, and one has only servers (in a CoLo facility). We will ...
3
votes
1answer
1k views

After upgrading BIND: Why is refusing requests? The server is on a NAT'd network

I already have a similar configuration working on another host with BIND 8.4.7 I'm migrating to a new name server so I decided to upgrade BIND to 9.7.3 The configuration is similar to this one, but ...
0
votes
1answer
152 views

Using twice NATTing and dns_Alg

I am trying to use twice nat along with dns_alg to support a framework, and take its measurements. I have a private network 192.168.0.0/24 this network contains www,dns,dhcp etc for its own ...
0
votes
1answer
631 views

Mac Mini server (10.6) behind router with FQDN hostname

I have a Mac Mini running Mac OS 10.6.6 Server that will be part of a local network, and a static IP from my ISP. I'd like to set up DNS for the Mini with a FQDN as the hostname (example.com) ...
0
votes
3answers
465 views

NAT cause huge External (actually internal) bandwidth usage

We have 4 servers running in a data center, with internal IP: 192.168.3.* assigned. A hardware (FORTIGATE) firewall configured NAT, and it will lead the traffic as: external IP: 111.222.333.10 ...
0
votes
3answers
1k views

How I can redirect DNS requests trought FreeBSD to another DNS

How to configure FreeBSD to redirect all DNS requests to other DNS. We have set up FreeBSD as router for our company. We have two cards, one for lan and second for WAN whic is configured as Public ...
0
votes
1answer
468 views

Resolving a FQDN to a local server

I have a domain name with WebFaction. I created a new subdomain that I want to point to a local server behind a NAT firewall. I can change the DNS records of the subdomain. What do I change so the ...
0
votes
2answers
2k views

NAT problem with UFW

I'm trying to setup up an Ubuntu server, and first I want it to act as NAT/router/firewall. My question is: How do I make it so the computers connected to the LAN, can access Internet? eth0 Link ...
2
votes
3answers
2k views

Unable to ping or access internet

I am setting up a private network. The server is Windows 2008 R2 with DNS installed and has a fixed external IP address. ipconfig outputs the following: PPP adapter RAS (Dial In) Interface: ...
2
votes
3answers
3k views

Cisco - NAT causes nslookup to return local IP

A little background: I have a server on my LAN that is statically NAT'd to its public IP in my Cisco 871. The rest of the same local subnet is statically NAT'd to a different Public IP, in order to ...