Fedora Networking :: Routing: 2 HW-Routers, 2 Nics On 1 Server?
Mar 19, 2011
i have a Server, which has 2 nics installed. Each of those is connected to a router, which is connected to internet. On the server, i have apache, maillserver and im-server running. On the other hand, also squid, dansguardian and clam are running. so now: via eth0 i would like to have just the traffic, which is requested from outside (the big bad internet..) to my server (apache, mail, etc). via eth1 i would like to have all OUTGOING (also to the big bad internet) from the server, which is requested by a internal client. And of course all requests to my own server
both nics shall route their traffic to their own router. For better comprehension please consult the enclosed graph. Until now, i did not find a good solution, the default route is set to the traffic from eth0, if not, no external request will find back to a client do you have a idea how to handle this the easiest way?
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Mar 10, 2011
I have a pc with debian 6 (without GUI) installed on it and want to use it as server at home. It has 2 ethernet nics. Now i want to configure the routing process. Searched internet for a long time found something but couldn't get it work.
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Aug 2, 2010
I'm trying to work out how to route all traffic destined for the internet from all devices connected to eth0 to a wireless router access point via wlan0 on my Slackware box. I also have dhcpd providing ip addresses on the same subnet to any device connected to both eth0 and wlan0.
Diagram:
Code:
____________ ____________
[ ]=============> (wifi) ==============>[ Router / ]
|Workstations| __________ |Access Point| 192.168.2.1
[____________]==>(eth0)==>[ ]<==(wlan0)==>[____________]
192.168.2.253| Server |192.168.2.254
[__________]
If I connect to the router/access point via wireless or directly to the Server via a crossover cable I can obtain an ip address from dhcpd, so that works. As far as I can see I just need to how to route between eth0 and wlan0 then I can provide internet access to those devices!
ifconfig:
Code:
eth0 Link encap:Ethernet HWaddr **:**:**:**:**:**
inet addr:192.168.2.253 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::201:2eff:fe27:aea3/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
[code].....
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Jan 13, 2010
I have 2 routers in my network, R1 and R2. R1 is doing BGP with ISP1 and R2 is doing BGP with ISP2. both R1 and R2 are advertising the exact same a.b.c.d/20 network to their neighbor on BGP.
This setup is working perfectly fine, people can enter reach machines and services inside our network regardless of what route they come in through.
The problem i have now is that R1 is now catering for a specific VLAN. now if a packet is destined for a machine on that VLAN but comes in through R2, then R2 does not know what to do with that packet since it is not connected to the VLAN.
This could probably be fixed by adding static routes, but I want this to happen dynamically so in the future, when introducing more vlans the routing table is updated automatically.
Could this be fixed with iBGP or OSPF somehow? I am using Quagga routing software
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Nov 9, 2009
I have configured CentOS 5.4 as a router/firewall (iptables) as such, and it is working fine:
eth0 - Public IP/Intenet, DHCP
eth1 - 192.168.0.0 internal "net1"
eth2 -10.0.0.0 internal "net2"
I want to add a fourth NIC, eth3, which will be assigned its own Public IP/Internet address (thru DHCP; my ISP provides two). The purpose it to route all net1's internet-bound traffic through eth0, and all of net2's internet traffic to eth3. This allows me to use one router/firewall machine instead of two separate ones. I anticipate that without some specific routing instructions, the default route will be eth0 for all net1 and net2 internet traffic (eth3 will be ignored).
I thought of using just one NIC (eth0) but create an alias (eth0:0), but IPtables (and possible DHCP) can't differentiate between the two (besides, nics are inexpensive). Is there a way to do this through routing commands, or even use iptables prerouting/forward functions (or is using iptables problematic)?
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Sep 10, 2010
I am having trouble for routing port 80 from a Billion adsl modem to a guest server in VirtualBox. There are quite few different changes from my last setup so I kind of confuse which one is wrong.
I used to use have the setup belowusing modem Linksys WAG354G use static ip 192.168.1.100 for my machine use static ip 192.168.1.102 for my guest VirtualBox server guest OS is serving http listening on port 80 i use bridge from my host OS for VirtualBox set my modem to direct all traffic on port 80 to 192.168.1.102 host OS was Fedora 11
now I useusing modem Billion 7404VNPX use same static address and configuration host OS is Fedora 13
main issue is I cannot reach the guest OS if I navigate to my modem ip address. (e.g. http://192.168.1.1) if I change the modem to direct all traffic to my host OS ip address (192.168.1.100) it works nicely.
I have tried to disable and enable the firewall without any luck.
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May 14, 2010
I want to make changes on my router bios for my server I have to go to my windows booted laptop rather than just 192.168.1.1 right here at my server. I only have to do a 360 in my chair and I am at my laptop but I don't want to. Everytime I type the gateway ip it reads off the name of my router and looks fine. But I enter my authentication info and it just returns the login window blank... something ubuntu-side?
WRT160v2 linksys wireless N router (Of course I have cat 5 running to my server)
Ubuntu 10.04 LTS running desktop ontop (because I am still learning how to navigate the console)
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Jul 19, 2009
Just something that struck me while working on our virtual servers today.
I have bonded 3 NICs at the host in Ubuntu Server 8.04 LTS. They are using mode 0 for Round-robin. Point is to increase the speed/performance of all the servers, but mainly the fileserver. The fileserver is a virtual server running Ubuntu Server 8.04 LTS on VMware Server 2.0.
1) I noticed the NIC in the slave OS reported link speed as 1000 and Im unable to change it as the NIC (virtual one) doesnt support it. Does this not really matter, as the NIC doesnt exist, and it will run at higher speeds anyway? Or do I have to remove the bond on the host, bridge all 3 interfaces from the host to the slave OS, and then make a bond in the slave OS?
2) While at it, does mode 0 only increase performance on data being sent from the host or does it also increase the available incoming bandwidth?
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Apr 6, 2010
I have a firewall, this consists of three NIC's:
Code: eth0[192.168.0.2] eth1[192.168.1.2] and eth2[10.10.165.2]
I am trying to ping eth0 from eth2, but I am not able to succesfully get a response from pinging the device, I am using:
Code: ping 192.168.0.2 -I eth2
I have tried to insert routing data into the routing table, but it still doesn't work
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Mar 31, 2011
configuring DHCP server with two NICs. I need DHCP server with 2 NICs:
eth1 - 192.168.103.11
eth2 - 192.168.123.11
The client also has two NICs and suppose to receive ip addresses eth1 from 192.168.103.0 and eth2 from 192.168.123.0 Here is the dhcpd.conf from dhcp server:
ddns-update-style interim;
authoritative;
ignore client-updates;
[code]....
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Mar 26, 2009
Here's the issue: from time to time I have to take away my son's access to the internet, so I exclude his laptop from my wireless Linksys router. Works like a charm, or it did until he discovered that my neighbor also has a wireless router, and hasn't secured it.
So my son sits in the corner of the house closest to my neighbor and uses their internet.
Is there any way I can tell his laptop to NOT access a particular router? Or even better, to only access my router?
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Aug 4, 2009
Every time I start up my Samsung NC10 the wifi doesn't seem to find my wireless router at all and instead tries to connect to my printers network. To solve this I need to disable and re-enable wireless until it automatically connects. I know this isn't exactly a major problem, it's just getting pretty annoying. I'm using Fedora 11 btw.
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Mar 6, 2011
I have so many _wired_ devices that I can't get by with just 4 eth cable outlets anymore, so I thought I'd hook up an older router that I don't use as a way to get extra places to plug devices into.
Now it looks like:
Internet
then cable modem
then router1/wifi + (1 eth NAT storage)
then router2 + 4 eth0 computers:
(legacy FC5 box)
(legacy F11 box)
(updated F13 box)
(windoze)
All of the computers EXCEPT the FC5 box are fine (my def of "fine" is I can ssh to and from the other computers and to outside computers, and browse the web).
The FC5 box, however, can ssh to and from computers inside the network just fine, but can't get any kind of web browsing. Nor can it ping to the outside. I get a "Network is unreachable" error. I'm not using a proxy, not knowingly, and my firewall settings haven't changed...it certainly hasn't been blocking port 80 before.
what's the best way to go about adding more ethernet when you need about 7 cables. I'm not really excited to buy a router with 8 ports or anything like that, especially when this seems to _almost_ be working just fine.
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Aug 18, 2010
I have a clean installation of Ubuntu Server 10.04 x64 on an HP Proliant DL380 G3. It has two Broadcom NICs in addition to its ILO. During the installation, both NICs were listed... but neither was able to pull DHCP, nor did they function with manual settings. The first NIC is currently connected and is known good. So I left it alone and figured I'd troubleshoot it later (which is now). This server is going to be a VMware Server host. I wanted to install ESXi on it, but it doesn't like the old server's cheap ICH RAID controller.
[Code]...
I noticed here it says they're disabled. so I thought perhaps this was a 64-bit driver issue. So, I booted my trusty Ubuntu desktop 10.04 32-bit live cd, and the NIC works fine. Now, here's where it gets weird. Seeing that, I booted it to Ubuntu server 10.04 32-bit installation from a flash drive, expecting to see the NICs working fine during the installation.
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Nov 27, 2009
I am trying to setup a HP blade (BL460) server with 2 nics on sles10sp3. I want one nic to connect to a management vlan and and second to connect to the standard network. It should be possible for a desktop in the standard network to connect to either nic by providing the correct ip address.use this server as our first virtualisation hosts server using Xen. I dont want traffic used to upload / download images to the server through nic1 to effect the users traffic on the standard network on nic2. However any attempt at routing (which Im not good at) has led to the tx traffic all going out the default route (users subnet).
Each time I setup the nics via yast2 lan I can get the standard lan nic working ok. but cannot get the management nic working correctly. The server can ping a workstation on another vlan, but the workstation cannot ping the management nic. The default route appears to be forcing all traffic on the host out through this route, which I presume is normal behaviour. Using tcpdump I can see the ping packets received by the server, the server then responds through the default gateway, which the workstation does not see.
However, this normal behaviour will result in extra traffic on the users network when image downloads are initiated from the management interface.If I use a 172.24.1.0 network routed through 172.24.1.1 router setup as our management vlan , and 200.200.1.0 with router 200.200.1.1 as our lan for general users. Where server ips are nic1 10.1.1.10 and nic2 200.200.1.10 My workstation would be 200.200.1.10. If I ping the server at 10.1.1.10
I get no response. If I ping the server at 200.200.1.20 no problem.
Basically I used the network setup recommended by vmware to manage a virtual server. I actually have 4 nics, I thought by just talking about 2 nics the problem would be easier to explain. vmware specify that two nics should be used for management and two for the Lan. This is what I am trying to achieve, but both subnets must operate independently.
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Apr 16, 2010
I recently set up a new web/file server with 9.10 server x64 with 2 NICs and I am trying to configure eth0 to respond to my LAN for internal samba filesharing and eth1 to handle website/ftp requests on my static IP, but whenever eth0 is up the server is not accessible at 173.XX.165.65 for web or ftp but both work fine at 10.1.10.100. When eth0 is down, public IP works fine. I have set /etc/network/interfaces like this:
Code:
# The primary network interface
auto eth0
iface eth0 inet static
address 10.1.10.100
[Code].....
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Nov 25, 2010
I have installed Ubuntu 64 10.04 server. I have two nics and have set them up to both be static with their own IP with the correct gateway, network, broadcast, subnet and dns-nameserver. When I have both enabled, I can ping local pc's but I can't ping Internet sites like Google nor can I get out to the Internet with apt-get or Lynx.
If I disable one, then I am able to get out to the Internet. All my configs look good, and it does not matter which one I disable, just so long as there is only one NIC on, everything is good.
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Jun 8, 2010
i know exactly what i need to do, im just not familiar enough with command line to do it properly.i have 7 computers.the first 4 are connected to a router via wireless at one end of the house. of the last 3 only 1 will be able to access the router via wireless, so it needs to share it's one wireless connection via ethernet. this computer i'm going to call 'server'server will have two IP'swlan0 192.168.1.6 this connects to the router that has internet access.eth0 i intend to have the following settingsip:192.168.0.1sub: 255.255.0eth0 will connect to a second router, where the cat5 cable goes from the server, into the internet port of the router where i will define the router's static IP:IP: 192.168.0.100sub: 255.255.255.0gateway 192.168.0.1i have then set the router IP for LAN handling as 192.168.27.1 and all ethernet connections will have a 192.168.27.x IP.
so i need to know how to, without a gui application, use the terminal to assign server eth0 a proper IP address, and tell the server to take the connection it has and share it through eth0 to supply internet for the last 2 computers via ethernet.i had it set up in this way with a windows machine being the one that had the wifi access, but i'd rather have it setup for the ubuntu server to do this task. security is imperative for these 3 remaining machines, so just getting 2 more wifi adapters for a connection to the initial router isn't an option.the 2 that connect to server do so through SSH and though server IS connected via wireless it only makes outward connections through
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Apr 12, 2009
I have a server that provides the access to the net. It has 3 nics 2 Realtek 100mb and a ne2000 isa 10mb card for the net. I ran an update from a working configuration on Fedora 9 to Fedora 10 with yum upgrade. Fedora 10 does not find the the ne2000 at boot time. After booting I can modprobe ne and the nic is found in a new network restart call. Has something changed how modules are loaded before udev runs?
Then there is the problem that nics are assigned the wrong interfaces(eth*). I have configured it in sysconfig with the files ifcfg-eth(0-2). I do not run NetworkManager. Has something changed in the configuration how the interfaces are assigned to the nics via the mac addresses?
I have tried to change the net profile of udev but since the ne2000 is not found at boot time but had no success. And one of the Realtek nics is not found at some times.
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Feb 4, 2010
I'm using Fedora 12 on a box with 2 separate NICs in different subnets. The problem is that after a reboot, both NICs always show up as eth0 when you left click on the networking icon on the top right. I have to manually change one of them to eth1 & then things start working.
DEVICE=eth0
HWADDR=(mac address)
BOOTPROTO=none
TYPE=Ethernet
ONBOOT=yes
[Code]....
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Feb 27, 2011
I have a server that has two NIC cards installed eth0 and eth1 we use a linksys router (192.168.2.1) which runs DNS for our LAN. I have installed Squid on the server which runs Ubuntu server (8.04 Hardy) w/ GUI. I can surf the net on the server with google chrome configured to use proxy server localhost:3128...works good. The router is wire directly to eth0. I have my laptop (running Ubuntu Hardy) wired to eth1 and I want to be able to surf the Internet through my server. From my laptop, I can ping 192.168.2.100 which is the IP address assigned to eth1[?] by my router. I assume I need to establish a route from my laptop to my server. I would like to archive this via the CLI and I am not having any luck thus far. If I add static IP addresses to eth1on the server and eth0 on my laptop will this simplify the process? How can I add a route which will allow me access to the Internet via my laptop?
Server:
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth1
0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 eth1
0.0.0.0 0.0.0.0 0.0.0.0 U 1000 0 0 eth0
ifconfig eth1 on the server:
Code:
eth1 Link encap:Ethernet HWaddr 00:30:48:85:cc:1b
inet addr:192.168.2.100 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::230:48ff:fe85:cc1b/64 Scope:Link
Up Broadcast running Multicast MTU:1500 Metric:1
RX packets:7701 errors:0 dropped:0 overruns:0 frame:0
TX packets:7898 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:5572718 (5.3 MB) TX bytes:1506869 (1.4 MB)
Base address:0x9000 Memory:ef400000-ef420000
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Apr 23, 2010
I have one main subnet 192.168.50.0/24 with a defaultrouter 192.168.50.1 connected to the internet. I have an NFS server on that network. Everything is working as desired and machines are able to see each other and access the internet.
Now, I would like to add two more interfaces to the NFS server (running Slackware Linux), each on its own different subnet, say 192.168.51.0/24 and 192.168.52.0/24. The clients on those new subnets should also be able to access the internet (through the router 192.168.50.1). how to setup routing? Do I need any additional hardware router in between, or just a software configuration on the NFS server?
On a side note I have VLAN capable switches (couple of ProCurve 1800-24G) and would like to separate the three subnets using VLANs instead of using three separate switches.
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Feb 9, 2010
I have the following setup:
Location A:
Internet -> ISP 1 -> Firewall 1 (external IP address) -> Web Server 1 (internal IP address)
Location B:
Internet -> ISP 1 -> ISP 2 -> Firewall 2 (external IP address) -> Web Server 2 (internal IP address)
I want to find out if I can failover to another location without having to make changes on the DNS server. Just by redirecting traffic from ISP 1 router to ISP 2 router.
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Jun 2, 2009
I recently built my second general-purpose server, and recently installed fedora core 10 on it. The first thing I attempted to set up after installation was the network - and that's where it's gone wrong When editing a network device using the graphical system-config-network utility, I find that the subnet mask is being automatically changed to match the default gateway address every time I attempt to modify any of its settings (or sometimes even when I cancel the changes). This also means that I cannot set the subnet mask, as it simply won't accept my setting for it. I seem to be able to get around this glitch by setting the subnet mask using the shell version of the same utility, but that doesn't solve my network issue.
Even when I use the shell utility to fix the subnet mask, I'm unable to ping other computers or routers on the network even when ifconfig indicates that the desired ip address has been taken, and other computers on the network are also unable to see the server. I'm using a wired connection and a static IP address on a network with no DHCP.
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Apr 23, 2009
I've just installed Fedora 10 to basically work as a NAS for another machine - but also serve a couple of web pages. After having alot of issues with network manager (with it changing the subnet so nothing would work), I'm now almost there:
I have two network cards connected in the server:
1) eth0 connects to a switch that ultimately connects it to the net (on a 10.0.0.* network)
2) eth1 connects directly into another server for backups (192.168.0.* network).
Now when I setup eth0, I get network access can ping/ update/ surf the net - absolutely no problems, but when I connect eth1 in - the net dies and nothing works, I can ping devices on both the 10.0.* and 192.168.* networks, just nothing past the gateway. I presume this is either a route or DNS issue, but am unsure about where its falling foul - both the resolv.conf file looks fine as do the ifcfg-ethx scripts.
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Dec 7, 2009
I have a program that attaches to an interface. I can run two copies of the program on two systems (each running one instance), connect it to a switch, say 1.1.1.1 & 1.1.2.1. In this configuration two instances of the program can communicate and everything is fine.Now, to reduce cost, it want to use only one system with two nics connected to the same switch, running two instances of the above program, each instance attached to two interfaces respectively on the system. I have the following settings:
eth1 Link encap:Ethernet HWaddr XXXXXXXXXXXXXXX
inet addr:1.1.1.1 Bcast:1.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]....
However I cannot ping one from the other.
Neither "ping -I eth1 1.1.2.1" nor "ping -I eth2 1.1.1.1" works.
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May 16, 2010
I've just set up an LTSP server, with all its clients on a separate subnet to my main network - the main network is 192.168.1.x, and the LTSP clients are all 192.168.2.x. My LTSP server has 2 NICs, one on each network, and is merrily forwarding normal IP traffic from the clients to the rest of the network. I have a client/server application that has a server on one machine, and clients locate and attach to it using multicast protocols. The server is on the main network, and any other machines on the network can locate and talk to the server quite happily. The LTSP clients, however, cannot - I assume because the multicast communications aren't being forwarded by the LTSP server. How I can get this working?
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May 21, 2010
I have set up a Virtual machine on a dedicated server from 1and1. I hoped to use a bridge to give the vm direct access to the internet but 1and1 do mac filtering and so the only option is to use NAT.
I used Virtual Machine Manager on my Ubuntu 10.04 machine at home to install Debain Lenny on the vm on the server using KVM and all went well. I put it on a virtual network 192.168.100.0 and i can access it from the host and i can access the internet from the guest using NAT that libvirt set-up.
I bought another ip address from 1and1 with the hope of forwarding packets to the new ip address 11.22.33.02 to the guest vm.
I have tried all sorts of routing rules using iptables without any success.
my virtual network is on virbr1 the guest ip is 192.168.100.50 my external network device is ip say 11.22.33.01 on eth0 with the secondary ip say 11.22.33.02 on eth0:1
Here are the latest rules i tried:
Quote:
iptables -t nat -A PREROUTING -d 11.22.33.02 -i eth0 -j DNAT --to-destination 192.168.100.50
iptables -t nat -A POSTROUTING -s 192.168.100.50 -o eth0 -j SNAT --to-source 11.22.33.02
iptables -A FORWARD -p tcp -i eth0 -o virbr1 -d 192.168.100.50 -m state --state NEW -j ACCEPT
iptables -A FORWARD -t filter -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
[Code].....
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Mar 3, 2009
I want to use tab networking in my kvm with routing.Can any one guide me how i can do it. i have been reading different guides over the net but not understand any one clearly.I have read this[URL].. One problem is this all my server are remote and no gui is running.I am able to install kvm with ssh console with -nographic and -x "console=ttyS0" option now i want to change from bridging to tap networking with routing.And i have live ip on kvm guest/Virtual machine.
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Feb 20, 2010
IN LAN default GW box I have a routing rule of 172.17.1.0 192.168.180.100 255.255.255.0 UG 0 0 0 eth3 that sends packets matching 172.17.1.0/24 to eth3 etc. When I ping 172.17.1.50 - it goes correctly when ping is issued in the same box (LAN GW) - falls through to default rule when the ping is done in LAN's boxes i.e. it goes to the LAN GW box and then to Internet incorrectly instead of going to eth3 and 192.168.180.100.
Is there any way of seeing why the packet matches or not the routing rules?
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