Doubly complicated. Simple router. Additional routing You can turn on additional routing feature, with multi-homing. They are created as follows: You need to install or create the three attached files: File: ifcfg-eth0 File: ifcfg-eth1 ifcfg-bond0 Have a look at the documentation for more detail about the options.
The loopback network interface auto lo iface lo inet loopback The primary network interface auto eth0 iface eth0 inet static address Once you write that file to disk, you can start that interface with the ifup command: ifup eth Now it is up and running unless you got tons of errors?
To verify that the new interface is up and running, use the ifconfig command as in: ifconfig This command lists all the interfaces, including aliases. But outbound traffic comes from the wrong IP address now! In that case, you want to add a new route. On the command line, it looks like this: route add -host 1. If you want all your traffic to go through eth0, then don't specify the destination IP as in: route dev eth0 This uses 0.
To keep the route permanent i. Somehow now Postfix is using the wrong IP address The route trick is not likely to work right with Postfix.
The settings go in main. More information For more details about all the options available in the interface file, check out the man page of the same name: man interfaces.
Try this at your own risk. From the Debian wiki. To test it, use your favorite DNS lookup tool pointed at localhost: dig debian. Do not use this configuration if you use different network e. Ever go somewhere and you need to have several systems be able to access their network, but they say all you cn have is one Ipaddress. An Ipaddress is like a phone number for a computer.
You can only have one per system under normal circumstances. Here with an extra system, we will show you how to do this. Note: This post assumes you already have your machine loaded up with a fresh copy of Ubuntu This is not a firewall. Configure the network interfaces You may need to make sure for older systems that plug and play os is enabled. They must be different from the host aka wan network.
As an example, this set includes allowing tcp traffic in from the outside world on port I run SSH on this alternate port and also port-forwards tcp port 50, to an internal machine with the ip of 10,1, Note that when you do this access to the system will be locked down amd ssh not work. Infact a ping to the system will be ignored. The system is going down for reboot NOW! Connection to You should be able to use your router now. NOte: you should be able to do this with most any distro, but using different commands.
Search related threads. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Scenario: There are three physically separated networks, no firewall or router connect them together. In each network there are DNS-servers that resolves hosts in only that network.
All networks have the same domain-suffix though. There are some hosts that are multihomed with one interface in each network, an these have DNS-servers from all three networks configured as resolvers. When this answers, it doesn't continue with the next DNS-server even though the answer is the the hostname is unknown. Question: Is there a way to get multihomed hosts to be able to resolve hostnames in all three networks? By design of the DNS, all name servers listed in the resolver configuration are assumed to have the same data.
Multiple name servers are meant for redundancy, not for split namespaces. So if one name server replies that a certain host name does not exist then that answer is considered authoritative and it doesn't make sense to ask for a second opinion from another name server. Either create separate subdomains for the three networks and delegate those to the name servers in the respective network only, while replicating the superior domain to the name servers in all three networks.
IMO that would be the cleanest solution. Program the inside "LAN" interface with an address on the network. Add firewall rules to allow the two You can further restrict access by port, so only https is allowed, for example. To eliminate the asymmetry, use NAT on the router. The rule would be to NAT And the reverse rule for outgoing traffic. Then, the card reader server will appear to be on the 10 network and reachable by only those IPs you specify. You have already figured out what the problem is.
You need a route setup for that subnet. Is the switch layer 3 by chance? Simply adding an IP to that vlan would enable the switch to act as a gateway for that network. It's a little tricky to try to explain in words what the network layout is..
I really need a diagram. In any case I'll try. This is a fairly simple network setup in that there is a single router that is the firewall to the internet and also acts as the router for all the VLANs. So coming from the client's perspective The issue is that when the packet gets sent via that router and arrives at the server, since the server has another NIC that is directly connected to the source network it doesn't send the packet back on the return path via the router.. The reason I know that something like this is happening is because the Card Access system used to be on it's own computer with only 1 NIC and was connected to the vlan and the routing worked as expected.
It's something to do with the server having another NIC on the same network as the client. The answer is even simpler: no one on the 10 network should be attempting to access anything on the network.
The server should be available to the 10 network on its 10 address.
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