Networking :: Connecting To External Network And Internet Via Two Gateways?
Nov 17, 2009
I`ve got a network (192.168.1.0/24)with common internet gateway (gw 192.168.1.253).Everything works good and i have access to i-net through 192.168.1.253 from all loacl machines. Then I tried to make and internal server as a firewall for local subnetwork. It is CentOS 5.3 based.
Code:
[root@router etc]# uname -a
Linux router 2.6.9-89.0.16.EL #1 Tue Nov 3 17:15:02 EST 2009 i686 i686 i386 GNU/Linux
[code]...
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Dec 1, 2010
I have 3 servers interconnected with IPs 192.168.150.1-3. First two has internet connection and third first server uses them as gateways. After googling and reading howtos I managed to get it working: The firewall for ssh on first server is defined
Code:
...
iptables -A EXTIN -p tcp --dport 23 -j ACCEPT
iptables -A FORWARD -p tcp -d 192.168.150.3 --dport 22 -j ACCEPT
iptables -t nat -A POSTROUTING -d 192.168.150.3 -p tcp --dport 22 -j SNAT --to 192.168.150.1
iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 23 -j DNAT --to 192.168.150.3:22
...
On Seconds server:
Code:
...
iptables -A EXTIN -p tcp --dport 23 -j ACCEPT
iptables -A FORWARD -p tcp -d 192.168.150.3 --dport 22 -j ACCEPT
iptables -t nat -A POSTROUTING -d 192.168.150.3 -p tcp --dport 22 -j SNAT --to 192.168.150.2
iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 23 -j DNAT --to 192.168.150.3:22
...
And on third route is defined like this:
Code:
ip route add default scope global nexthop via 192.168.150.1 dev eth0 nexthop via 192.168.150.2 dev eth0
It works, but the problem is that connections on third server are shown that their connected from 192.168.150.1 or 192.168.150.2. Are there is any way to keep original connection source address, when connecting to 192.168.150.3?
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May 11, 2010
I installed the CentOS v5.4 on a virtual machine vmware server v1.0. I put the the vmware ethernet on bridged mode and now I have an ip address, subnet mask and dns from my dhcp server from the the office where I am. I edit the file /etc/sysconfig/network and I put there the gateway ip. Now is okay but not at my home where I have another gateway ip. a script who switch between my gateways ?
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Jul 20, 2010
I have an iBook G4 running Debian Lenny. I was wondering, is there anyway to connect to the internet while on a Windows network at school over Ethernet using smbclient? I have both GNOME 2.22 and LXDE .5 on the machine.
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Nov 13, 2010
I setup a network bridge on pc A, with windows 7 installed on it, using windows default bridging tool. I connected computer B to computer A and Im trying to connect to the internet through the network bridge on computer A. Computer B (client) has two OS's installed, win XP and linux(tried with different distributions, didnt work). On windows XP everything is working, when i try to ping the router (after computer A) it also responds. On linux system nothing is working, and im not quite sure why.
I set up linux to receive IP adress from DHCP, which is router in this case (behind computer A), same way windows XP was configured. I decided to ask here, because I couldn't find anything on the net. My guess is windows-made bridge supports only windows-OS's but that would be kind of strange (its just a software bridge).
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Jun 10, 2010
I just installed Ubuntu server edition on to an old Dell desktop. The only problem is that I can't get the Internet to work. I have tried the following and I guess it doesn't work:
Code:
sudo ifconfig eth0 192.168.1.52/24 up
sudo route add default gw 192.168.1.1
Each of those commands don't give me any error and it would seem like everything works fine, until I try to ping google or any website and I get an error that tells me that no host was found. I am using version 10.04 of Ubuntu server.
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Jul 9, 2011
I have a wireless router, but my desktop computer is connecting to it, or maybe to the modem, by an Ethernet cable. It has a built-in wireless card, so just as an experiment, I tried to connect to my network wirelessly. It didn't work. And not only did I not get any internet connection, I can't get any internet through the wired connection either. The internet works fine with Windows Vista (I'm dual-booting), as well as when I boot up Backtrack off of a Live DVD. I can still access my router's config page by going to 192.168.2.1 on a web browser, but I can't access anything else.
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Feb 9, 2010
I just installed Ubuntu 9.10 and its great. However when I connect to the internet at home it shows that the connection has been established but I still cant connect to the internet. My flatmates are all able to connect. However, I am able to connect from work both wirelessly and through an ethernet cable.
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Jun 24, 2011
After a recent installation and update I am having problems connecting to the internet even after following the steps in [URL]... Configure a network card in Suse/openSUSE...." It doesn't always connect when I boot and there is no connection icon on the panel nor the KDE desktop. Can someone assist me with this problem?
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Aug 30, 2010
I have a few computers all connected to the same router both wireless and wired. All at the moment are running Ubuntu. There is no problem sharing any of these computer's local drives through the network. However I have one desktop with an external USB Hard disc plugged into it. I would like to share this external hard disc on the network. I set it up to share but when I try and access it from one of the other computers on the network, although it shows up, I get the message "Unable to mount location. Failed to mount windows share".
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Jun 3, 2010
im having problems connecting mybook 2 with my laptop. Everything was ok and running perfectly and there was no changes in my laptop or upgrades and it stop working. I was not able to see the computers in my network then I fixed it I can see them but when I try to browse the files the OS tells me that is unable to mount location and failed to retrieve share list from server. The funny part is that if I go to Places>Connect to server and type my mybook ip address, my laptop can connect and I can browse the files. I really dont know what is the problem. My firewall is down so I dont think that is the problem. If anyone can help me with these because I know im able to connect to my mybook but i am unable to connect to any other laptop or my WD-Tv live.
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Apr 6, 2010
I'm hosting a Sendmail Cyrus-Imap server on fedora 12. I recently installed a second NIC on a second internet gateway and successfully configured source based routing. Clients are able to connect over the mail.domain.com received from the gateway 192.168.0.1 to the interface 192.168.0.254. ETH0. Clients are also able to connect from pop3.domain.com and smtp.domain.com from the second gateway 192.168.1.1 to the interface 192.168.1.254. ETH1
I have cyrus-imap certs configured for the mail.domain.com and a Sendmial cert configured for mail.domain.com. My question is how would I tell sendmail and cyrus that the mail.domain.com goes out the ETH0 but deliver the second and third cert (eg cyrus sends pop3.domain.com and sendmail sends smtp.domain.com) to clients connected on ETH1?
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Mar 24, 2010
I have a CentOS5 box I use to run ASSP for Anti-spam. It has a single NIC. I configure network settings using Webmin. I have two Internet connections managed by different routers.
Router 1 - 10.0.0.254 255.255.255.0
Router 2 - 10.0.0.250 255.255.255.0
CentOS - 10.0.0.30 255.255.255.0
Both routers port forward traffic on port 25 (SMTP) to the CentOS box. The SMTP connections only work for the router that is the default gateway on the CentOS box! If Router 1 is configured as the default gateway in CentOS then I can Telnet to that routers WAN IP on port 25 and successfully send mail! On Router 2 I get no connection unless I change the default gateway in CentOS to be the IP of Router 2 thern Router 1 SMTP connections will not work! I imagine that CentOS is sending out it's responses to the default gateway instead of the Router that initiated the port forward?
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Mar 31, 2011
I would like to connect a PC (it has no white IP) through Internet. It's possible to create tunnel with SSH, but I need more easy way. May be there is some service exists (like TeamViewer), so people can just run simple command on that PC?
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Aug 16, 2010
Am not able to browse on Linux 5.please provide me step by step procedure to config internet on my Linux 5
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Sep 20, 2010
Currently my office use a Cisco Firewall which will only allow the ANYCONNECT utility to do the vpn connection. I found a Linux utility (OpenConnect) which will do the same thing, but allow me more flexibility with my networking needs.What I ultimately would like to have is to have a switch that I can connect any network device into it and be connected to the office. IE (my IP Work Phone and Computer) Currently I have is a computer with fedora 13 and two network cards eth0 (home network - connected to a router) and eth1 which I would like to connect a switch to. OpenConnect communicates fine and I can see the work network from the Fedora machine. It creates a vpn0 tun/tap device and I don't know how to pass communication to/from the eth1 device.
Do I try to iptables the ports for the phone and services I need on the computer? Or do I build bridge; and If I do what am I bridging. I have tried making a bridge from eth1 to vpn0 which reply's with unsupported device or something like that.Unfortunately my network skills are bit limited and my office says "it can't be done". Their solution is for me to buy a ASA5505 (or something device) and have a static IP. I would have to make it work as my router and even then it will only DHCP 10 ip addresses; which will cause a shortage of IP addresses in the house.
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Jan 16, 2011
I just want to use Internet Connection Sharing (ICS) to connect to the internet. I have done a massive amount of troubleshooting, but some of it seems to contradict itself, and the only two things that I know for sure are that it used to work, and that my Ethernet cable is not the problem. When I use Terminal utilities like ifup and dhclient it seems that it can not determine IP information, but when I try to put it in manually, the "Apply" button grays out right after I finish typing it in. When I try to connect normally, in KDE or GNOME, the icon acts like it's connecting, then instead of having the connected icon, I receive a notification that "the network has been disconnected", and it goes back to the disconnected icon.
Oh, and by the way, I know that I could probably find a workaround, but I have limited resources, and this used to work. The Linux is a Dell desktop with Fedora 12 and the Windows is a Windows 7 HP laptop.EDIT: I hope that I didn't mess something up, but I accidentally used system-network-config to try putting in the IP address there, and ended up changing it back to the original settings, but the computer is now calling it Auto Ethernet in the taskbar icon, although sudo iwconfig in the terminal still calls it eth0.
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Apr 15, 2010
I'm using ADSL modem (not router) and I can't connect to internet. The network manager and the pppoe-setup command doesn't work. So I'm asking some of the experienced users of fedora 12 to help me setup my connection.
Details: ADSL modem with pppoe connection (working fine on win xp)
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Jan 19, 2010
I'm running Ubuntu 9.10 Live CD and I can't connect to the internet. I click on System --> Preferences --> Network connections and under the tab DSL I click Add. After i fill the information I click to connect to the new connection and after a while it shows me a baloon which says "Wired network: Disconnected - you are now offline".
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Jul 29, 2010
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The exact error I am getting is pasted below.
[root@pscu1320 ppp]# pppd call gprs-wavecom
GPRS modem init: press <ctrl>-C to disconnect
Wakeup Modem
[Code].....
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Apr 5, 2011
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Feb 27, 2010
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Mar 4, 2009
I recently set up a network of computers via Ethernet, all of which use Fedora 10. I would like to be able to get any computer on the network to hook up to the internet.(I think the solution is now figured out - see below, on page 2, "problem solved")
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Mar 27, 2009
How can I connect laptop to internet using GPRS enabled Phone?
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Feb 21, 2010
I have a problem connecting to the internet using Ubuntu 9.10 . But the same works fine in Ubuntu 9.04.. First I thought it was my hardware problem and asked my friend(also was using ubuntu 9.04) to try ubuntu 9.10 but he too failed to connect....
I have an wired ADSL Modem given by my Service Provider. When I switch on my modem the router gets connected but it cannot connect me to internet...
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Jun 19, 2010
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[Code]....
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