Ubuntu Networking :: Getting Dynamic Ip Addresses For Multiple Interfaces?
May 6, 2010I have 4 Ethernet Interfaces. I need Dynamic IP-Addresses for 2 Interfaces. Can anybody help me how can i achieve that
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Ubuntu Networking :: Upstart Vs. Multiple IP Addresses ?
Jan 27, 2010I have run into a problem that I've tracked down to being a conflict between the "Upstart" init system, and how it handles multiple (alias) IP addresses per physical interface. The summary of the problem is that the interfaces are being configured in the background in parallel with the starting of daemons. One "feature" of this (apparently intended for pluggable devices that would add or remove an interface) is that the network daemons are restarted each time an interface is added (and presumably deleted). But this is a disaster when applied to alias IP addresses.
I first saw the effects of this when during booting Ubuntu Server, the screen showed a message about OpenSSH daemon being restarted ... several times a few seconds apart each. At the time I didn't know what was causing that, but didn't worry because it ultimately was running when I needed it.
But now that I am deploying these servers for specific duty with many IP addresses per system (per network interface), the symptoms are becoming serious, and I need a solution.
1. The IP addresses are coming online too slowly. Apparently the time it takes to restart each daemon is being added to each address being configured.
2. It appears to be disrupting some daemons sometimes. Occaisionally, some daemon just ends up being hung somewhere, or dies. Too many restarts.
3. Sometimes few or even no alias addresses get configured. This might be due to a daemon getting hung, and the whole sequence just not finishing.
4. The "nsd" name server as packaged by Ubuntu doesn't deal well with this at all. It needs all its IP addresses to be up when it starts, or else it won't start. The Ubuntu package of it doesn't including any if-up script at all, although I'm not sure that would do any good.
What I need is a way to configure all these alias IP addresses so they are all configured immediately when the point in time is reached to bring up network interfaces for the first time. These are all static, and all are aliases on ethernet NIC cards plugged into PCIe cards, or integrated in the mainboard. None of them are pluggables. I did run a manual test of "ifconfig" in a loop configuring 2540 alias IP address on eth0 and it only took 2 seconds (no if-up triggers or daemon restarts here). So I know it's fast if nothing else is done between these steps.
Even for pluggable physical interfaces, I see no reason to even try to step through every alias (if it has aliases) with a daemon restart. If an alias IP address is added on later, then I can understand doing it. But if you have a list of 100 aliases for a physical interface, they really should all be done ... or at least attempted ... at once, and do any triggers needed after that.
So, how can I configure or modify Ubuntu Server 9.10 to do that?
I have each alias listed in the "/etc/network/interfaces" file with a separate "auto" and "iface" section for each one, with sequential sub-interface numbers appended to the interface name. I tried it without those sections (e.g. just "address" and other items in sequence) and that prevents the system from even coming up (bootable CD to the rescue to undo that). At least cntrl-alt-del did reboot it.
I tried to attach the /etc/network/interfaces file, but I don't know if it worked because I see no confirmations about it. if it didn't attach and you need to see it, say so, and I'll just paste it in a followup.
Networking :: Getting A Firewall With Multiple Interfaces?
Mar 11, 2010I would like a basic firewall on my netbook and first attempted this by using firestarter as i have no experience in writing IPTABLES rules from first principle and to be honest the syntax looks horrific! the problem with firestarted is that when i selected WLAN0 to be the internet connected port everything worked fine until i connected to a VPN at which nothing would work (the only error i got was when pinging an IP address when i got sendmsg not permitted) my normal setup is this.... normally im connected via WLAN0 to the internet. but one one particular network i must activate the VPN to use anything, this creates another interface tun0. both wlan0 and tun0 will be assigned an ip address but only the tun0 will do anything (the wlan0 one is configured by the network to just allow traffic to the vpn gateway and nothing else) what i really need is some way of creating a basic firewall (drop all incomming except ports i specify) that lives on wlan0 unless tun0 is active in which case it moves to tun0
View 3 Replies View RelatedNetworking :: Using Multiple Interfaces For Tcpdump?
Feb 16, 2011Is there a way to do multiple interfaces in tcpdump? I have found that when using "-i any", not all packets are captured (compared to "-i eth0" on a machine with only one interface). I need to monitor traffic on some machines with as many as 6 interfaces, and get these packets that "-i any" misses. When I give the "-i" option multiple times, it seems to only use the last one.
View 3 Replies View RelatedNetworking :: NAT With Multiple Internet Addresses
Mar 8, 2010My Linux gateway has multiple address to internet:
eth0 = 76.148.200.3
eth0:0 = 76.148.200.4
eth0:1 = 76.148.200.5
and it's own gateway which is 76.148.200.2 (probably not relevant) and I also have which is not internet, but local:
eth0:2 = 192.168.0.1 netmask 255.255.255.0
They all work fine and tested. Now I am sharing the internet through eth0 (76.148.200.3) to 192.168.0.1/24 and that's working fine. The script I use to do that is here...
Code:
#!/bin/sh
echo 1 >/proc/sys/net/ipv4/ip_forward
echo 1 >/proc/sys/net/ipv4/ip_dynaddr
iptables -t nat --flush
iptables -A FORWARD -i eth0 -d 192.168.0.1/24 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -s 192.168.0.1/24 -o eth0 -j ACCEPT
iptables -A FORWARD -j LOG
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
Now all I want to change in the script is to share it through 76.148.200.4 (eth0:1) instead of what is already sharing through 76.148.200.3 (eth0). I am sure this is easy but can't work it out and iptables doesn't accept 'aliases'. How I can do this by modifying this script?
Ubuntu Networking :: Multiple Interfaces In Network Manager Have The Same Name
Apr 7, 2011I have a problem where multiple interfaces in my network manager have the same name. This means that I am unable to have different settings for each interface. Here is my setup:
Ubuntu 10.04 LTS
uname -a: Linux muon 2.6.32-30-generic #59-Ubuntu SMP Tue Mar 1 21:30:21 UTC 2011 i686 GNU/Linux
Adapter 1: 02:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet Controller (Copper) (rev 03)
Adapter 2: HTC Desire tethered via USB. When I start from scratch, with no remembered networks in the network manager, the Ethernet is shown as "Auto Ethernet". When I then connect the HTC Desire, the new network is shown in the network manager also as "Auto Ethernet". Previously, when I right clicked on the network manager and selected "Edit Connections", there were multiple "Auto Ethernet" entries under the wired tab.
Now (and I do not know what changed, sorry), I only see one entry. When I edit this entry (say, add a route), then the route is added for both network interfaces. This used to still work, so I was not worried about the name clash, but now it is causing problems so I need to have a different name for each network interface.
Fedora Networking :: What Happens With Multiple Network Interfaces
Apr 30, 2009What traffic goes where? Why? Any bandwidth advantage? What if one goes down?
View 4 Replies View RelatedNetworking :: Splitting The Traffic On Multiple Interfaces?
Jul 6, 2010I have the following setup: Client A, having 2 network interfaces, eth0 and eth1, both with the IP address 192.168.1.1/32. Client B, also having 2 network interfaces, eth0 and eth1, with the IP addresses 192.168.1.2. The routing table on client A has one entry: 192.168.1.2 dev eth0 The routing table on client B has one entry: 192.168.1.2 dev eth1. Basically the idea is to send the upload traffic one one interface and the download traffic on the other interface. (Client B could serve as a gateway). However, with this setup, well... nothing works. The packets received by Client B are ignored. Does the linux kernel have anything against routing packets coming from an interface, although he thinks the source is on another interface?
View 4 Replies View RelatedNetworking :: Combining Multiple Interfaces With Multicast?
Apr 1, 2010I have 4 interfaces, dvb0_0 - dvb0_3. Each one has a multicast stream coming in on it. The program I am using to decode these streams only accepts one interface though. How can I "combine" so that the program, listening on 1 ip can get all 4 streams? they are on groups 224.0.1.1-4
View 1 Replies View RelatedNetworking :: Receiving Multicast On Multiple Interfaces?
Jul 9, 2010I am trying to run some benchmark tests for multicast. What I want to do is have one system send multicast packets and another receive it on all it's interfaces (eth0-eth3). Whenever I run receiver on more than one interface I get echo effect (if I receive on x interfaces then I get same packet x number of times). Is this how it is supposed to behave? It does not make any difference whether I use loop-back or not. I have set SO_REUSEADDR to yes. I run separate instance of receiver on each interface. I am doing this on RHEL5 systems.
# uname -r
2.6.18-164.20.1.el5
Networking :: Udev Failure With Multiple Interfaces
Jan 7, 2011 I have got a problem in the configuration of the network for my Linux box. The distribution is Slackware 12.2 with the 2.6.27.7-smp kernel. There are three ethernet NIC, one on the motherboard with Atheros AR8121/AR8113 chip and two on PCI card which with RealTek 8169.
I installed the module for Atheros which is the atl1e.ko and I defined the configuration for the three NICs in /etc/rc.d/rc.inet1.conf.
When I hit the commend ifconfig I see all the three interfaces eth0, eth1, and eth2, but the address are not distributed between the NICs as I'd like so I thought to resolve the inconvience with udev, but I don't know how to proceed because there is a strange situation.
If I control the file /etc/udev/rules.d/70-persistent-net.rules I see a strange situation: Once the file contains nonly a line for the Atheros NIC but if I reboot the system there are the two lines for the two RealTek NICs and everytime the system is rebooted there is a change between these two alternatives. A detail I noted is that the two modules atl1e and r8169 are both always loaded, so udev has always the chance to detect the hardware but for some reason that I don't know something goes wrong. Another related problem that bothers me is the absence of udevinfo and udevtest. Have I perhaps to reinstall udev?
Ubuntu Networking :: Multiple Network Interfaces (one Connected At A Time)?
Oct 15, 2010configure a server with two network interfaces? This system is physically moved from one network to another every few days (different buildings but connected by a VPN). I'd like to be able to control the IP address of the system depending on which port I plug the network cable into with a static setting. Right now the system will connect to the local network, but any requests to go beyond the subnet get lost. The only way I can get the system to talk outside of its subnet is to comment out the second interface.
/etc/network/interfaces:
auto lo
iface lo inet loopback
auto eth0
[code]....
Ubuntu Networking :: Multiple Interfaces - Connect Server From Computer
Mar 6, 2011I have a built-in gigabit Ethernet card which is connected to a router. Router's IP address is 192.168.2.1 My IP is 192.168.2.161 (eth0) I also have a Nokia N900 connected via USB and its IP is 192.168.1.1. It serves as a second router and on that interface (usb0) my IP is 192.168.1.2 N900 is also connected to a wireless network. Router of that network has the IP 10.0.0.1 and N900's IP is 10.0.0.50 (wlan0) My problem is that I want to reach a server at 10.0.0.7 from my computer. Is there a way I can do that?
View 1 Replies View RelatedNetworking :: DHCP Script - Assigning Multiple IP Addresses By Mac?
Sep 6, 2010Ive been trying to give certain clients an IP adres by mac adress. For this I use the folowing code:
host apex {
hardware ethernet 00:00:00:00:00:00;
fixed-address 192.168.250.100;
}
This works perfectly, however when I try to add a second client this way it doesnt. I tried to add the above code multiple times as a whole (2 times the above code) but that doesnt work. I also tried to just add more lines under host apex but this also doesnt work.
So my question is: How do I add more of this mac related IP adress assignments in the dhcp.conf?
Networking :: Forward Multiple Public Addresses With Iptables?
Jun 3, 2011iptables and multiple public-facing IP addresses. With the current setup I have a public-facing firewall with iptables which will then forward traffic to a LAN IP. I will hopefully be allotted 1 private IP per public IP, which I hope will make this much more simple. For example, I have server A with the LAN IP of 10.0.0.1 which I would like to have traffic forwarded from 5.0.0.1, the public IP. I also have server B with LAN IP of 10.0.0.2 which I would like to have forwarded from 5.0.0.2, the second public IP. From what I have read and understood, this should be a simple task, however I would just like to double check to make sure that it is in fact possible, and if so, how would it be recommended that I go about doing so. Essentially, I need to forward each public IP to a corresponding LAN IP with all ports.
View 3 Replies View RelatedNetworking :: Multiple IPV4 Addresses Not Working After Boot
Oct 15, 2010Fedora 12 running under VirtualBox 3.2.8 w/ Bridged networking
Host OS Windows 7
I have 3 IP addresses set up in on my Fedora 12 installation:
Directory: /etc/sysconfig/network-scripts/
ifcfg-eth0 -> 192.168.0.170
ifcfg-eth0:0 -> 192.168.0.171
ifcfg-eth0:1 -> 192.168.0.172
Hostname is configured to host associated with 192.168.0.170 in /etc/hosts
When I reboot and execute
# ifconfig
eth0 is associated with the 172 address and the other addresses are not active. After I run
# service network restart
All of the addresses are active and associated with the correct interfaces. Content of my ifcfg files below:
/etc/sysconfig/network-scripts/ifcfg-eth0 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0
HWADDR=08:00:27:0A:9D:24
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.170
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
NM_CONTROLLED=yes
/etc/sysconfig/network-scripts/ifcfg-eth0:0 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0:0
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.171
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
ONPARENT=yes
NM_CONTROLLED=yes
ONBOOT=yes
/etc/sysconfig/network-scripts/ifcfg-eth0:1 :
Code:
# Intel Corporation 82540EM Gigabit Ethernet Controller
DEVICE=eth0:1
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.0.172
PREFIX=24
DNS1=192.168.0.1
NAME="System eth0:1"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
GATEWAY=192.168.0.1
IPV6INIT=no
USERCTL=no
ONPARENT=yes
NM_CONTROLLED=yes
ONBOOT=yes
After booting:
Code:
# ifconfig
eth0 ....
Restart network:
Code:
# service network restart
. . .
# ifconfig
eth0 ....
eth0:0 ....
eth0:1 ....
Fedora Networking :: Set Up Multiple Virt Interfaces In Network-scripts?
May 15, 2009if I want to do eth1, eth1:0, eth1:1 etc and automatically configure them at startup where do I put that in the network-scripts?
View 2 Replies View RelatedNetworking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?
Feb 26, 2011I have two network interfaces and their entries are shown as eth0 and eth1... I want to assign them static IPs which I do by
ifconfig eth0 192.168.9.245 netmask 255.255.0.0 up
ifconfig eth1 192.168.8.245 netmask 255.255.0.0 up
But I am not sure if it will ping both the interfaces if I issue a command
ping -I eth0 192.168.9.113 (machine in network)
ping -I eth1 192.168.9.113 (machine in network)
I am getting pings from eth0 but not from eth1
CentOS 5 Server :: Use DHCP All Our Clients Use Dynamic IP Addresses For The Ease?
Sep 1, 2010I'm new to Centos 5 (and Linux) and, after installing Centos, I configured Samba, Apche, ... w/o problems (through interactive interface). My problem is tha t I need to use DHCP (all our clients use dynamic IP addresses for the ease) but I don't find dhcpd ... nor the sample config file(s).
Note : the new server I intend to use is actually connected on a LAN with an 'old' DHCP server (still under W2K server), is this the reason why I can't find/activate dhcp on my new machine ???
CentOS 5 Networking :: Multiple Static ISP IP Addresses / Servers Configuration
Mar 31, 2011I have a CentOS5 server with dual ethernet adapters + Webmin installed as my Router / Firewall / DHCP server working successfully with 1 static IP from my ISP. I also have 7 additional static IP addresses from my ISP needing to configure to individual servers inside my network. I have configured the additional virtual interfaces, but am lost on how to route data specifically from additional ISP address to specific internal network address.
Below is my desired configuration.
98.173.159.xx1 = eth0 physical interface ==> eth1 192.168.1.1
98.173.159.xx2 = eth0:1 virtual interface ==> 192.168.1.10 ==> CentOS Server 2
98.173.159.xx3 = eth0:2 virtual interface ==> 192.168.1.20 ==> CentOS Server 3
98.173.159.xx4 = eth0:3 virtual interface ==> 192.168.1.30 ==> CentOS Server 4
98.173.159.xx5 = eth0:4 virtual interface ==> 192.168.1.40 ==> Mac OS X Server 1
98.173.159.xx6 = eth0:5 virtual interface ==> 192.168.1.50 ==> Mac OS X Server 1
98.173.159.xx7 = eth0:6 virtual interface ==> 192.168.1.60 ==> Network Attached Storage Server 1
98.173.159.xx8 = eth0:7 virtual interface ==> 192.168.1.70 ==> Windows 2008 Server 1
Ubuntu Networking :: Multiple External IP Addresses With Single Physical Ethernet Card And Virtualization
Feb 16, 2010I recently installed Ubuntu Server 9.10 with the intent of using it as a platform for running a couple of Windows XP virtual machines along with Linux/Ubuntu.
I had no problems getting the server installed. Had no problems getting the network up and running so that I had access to both my internal network as well as external connectivity to the internet. Had no problems getting a VM installed and putting Windows XP inside of it. Had no problems setting up a bridge between the WinXP virtual machine and the physical ethernet card (eth0).
What Im having trouble with is figuring out how to bridge from multiple VMs AND Ubuntu natively through one physical ethernet card.
When I set up the bridge, it knocks out the static IP address of the ethernet card that was set up initially with Ubuntu when first installed before the VM was created and installed. Therefore, connectivity within Ubuntu natively is lost.
Similarly, am having trouble figuring out how the second VM (also going to be running WinXP) is going to get its connectivity since it doesnt seem to like me setting up 2 bridges to the same physical ethernet interface card.
I need all 3 machines to have static IP addresses and be visible/accessible from the external network for either web/mail/dns/etc servers on the Ubuntu side and for remote PC control functionality on the VM side.
I have tried setting up alias ethernet interfaces (eth0:1, eth0:2, eth0:3) with static addresses which work fine from native Ubuntu in presenting multiple IP addressees, but it seems that Im not permitted to bridge to these alias interfaces.
General :: Use 'iw' To Create Multiple Virtual Interfaces To Connect To Multiple Networks?
Oct 26, 2010I'm trying to connect one computer to two others in an ad-hoc infrastructure.
[computer 1] ---- [computer 2] ---- [computer 3]
computer 2 is running Linux and has a single NIC wlan0. I want to it to connect to both computer 1 and computer 3 so each computer can talk to the other. No switch is available so it needs to be an ad-hoc setup.
[Code]...
Ubuntu Networking :: ADVISEADDR: Error In Specifying Interfaces: No Existing Ip Interfaces Found
Jan 7, 2010I have a weird issue that I have not seen on any forum. My jaunty on DELL studio laptop seems connected to net, but I can not access any network service (ssh, firefox etc.). But when I connect a cable the cable lights blink as it should be and in wireless connection my wifi light blinks.
It was working 2 days ago without problem, and I have not done big changes recently.I removed and reinstalled network-manager and network-manager-gnome. Nothing changed. I see a message in each restart as follows (when Openafs is starting). I can reproduce it with "/etc/init.d/openafs-client restart"
Code:
ADVISEADDR:error in specifying interfaces: no existing ip interfaces found
#lspci
Code:
04:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
08:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
#lshw -c network
[code].....
Ubuntu Networking :: Adding Interfaces To /etc/network/interfaces?
Apr 16, 2010If I try to add a new interface (eth1) to /etc/network/interfaces, I get
Code:
* Reconfiguring network interfaces... SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
[Code]...
How do I add 2 interfaces and get anyone of them to work, as available ?
Fedora Networking :: Enable 3 Interfaces \ When Start One Interface The Another Interfaces Goes Down?
Jan 25, 2010I have 3 Interfaces for a different LAN's and when I start one interface the another interfaces goes down.How can it's possible?I configure my ethernets as:
Code:
/sbin/ifconfig eth0 172.16.3.108 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth1 172.16.3.109 netmask 255.255.0.0 broadcast 172.0.255.255
/sbin/ifconfig eth2 172.16.3.1110 netmask 255.255.0.0 broadcast 172.0.255.255
Server :: Hosting Multiple Subdomains On 1 Dynamic IP?
May 16, 2009I run my own DNS servers and host my own domains. I'd like to host a few subdomains of one of my domains on a server with a dynamic IP. Is there a way to do this? I *believe* that I can host one subdomain by using a CNAME record and a dynamic DNS service.
[code]....
How can I host more than one subdomain on a server with a dynamic IP address?
General :: Multiple Interfaces To One IP Address?
May 30, 2010At present, I have:
a Netgear router with DHCP off at 192.168.0.1 my computer
eth0 at 192.168.0.2
wlan0 at 192.168.0.2
The wlan0 interface always connects to the router, while the eth0 interface connects to other computers with crossover and acts as a dnsmasq DHCP server for network boot and installation.
If I use the Gnome NetworkManager to enable both connections, that is, with wlan0 connected to the router/internet and eth0 to another computer, both as 192.168.0.2, I cannot access the internet while eth0 is connected.
Why is this? How can I configure my computer to follow wlan0 for Internet usage, but use eth0 for itself (the latter is working but blocking wlan0).
Server :: Remove Dynamic String Across Multiple Lines And Files?
May 13, 2011My server was hit with an injection script which has placed code across many of my clients files. I need a script that can remove a block of php code that spans multiple lines, multiple directories/files and is dynamic, meaning that part of the code changes. I think using find/sed is what I need but cannot seem to figure out how to get it to work.The following is the script that is being injected everywhere. The catch is that they have generated dynamic code at the start/end of the script. (I have commented the parts that are dynamically changing on EVERY instance).PLEASE NOTE: Directly following this script is the start of a valid php script that I do not want to delete.
<?php
//{{65281980 - DYNAMIC!!
GLOBAL $alreadyxxx;
[code]...
Debian Configuration :: KVM / One Interface / Multiple IP Addresses
Dec 27, 2015I'm renting a server which comes with 5 IP addresses, but only one network device. From what I can understand I'm able to create aliases by adding entries to /etc/networks/interfaces, I haven't tried I'm in the planning stages. Hypothetically, 192.168.22.30 is my primary IP and I want to set eth0:1 to have 192.168.22.31, and then after that I want to create a virtual machine (using kvm/qemu) that is able to communicate bidirectionally to the internet over eth0:1, and leave eth0 strictly for administrating (not for VM traffic).
The qemu guides I'm finding seem to assume that I want to use TAP or VDE, what I want to use is a sub-ip/alias. One guide I saw had me eliminate everything from eth0 and put it under br0. That would leave me unable to ssh into my server (and unable to administrate). Is there a way I can do something along the lines of: qemu [options] -net [option] -netdev=eth0:1 ?
OpenSUSE Network :: Set Multiple IP Addresses Onto Server?
Jul 23, 2011I want to set multiple IP addresses onto my server and I can then put under an alias.
But is it possible to somehow create a script in perl example that can do this for or is it only possible manually?
