Networking :: NAT With Multiple Internet Addresses

Mar 8, 2010

My 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?

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Ubuntu Networking :: Upstart Vs. Multiple IP Addresses ?

Jan 27, 2010

I 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.

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May 6, 2010

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Sep 6, 2010

Ive 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.

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Jun 3, 2011

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Oct 15, 2010

Fedora 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 ....

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Below is my desired configuration.
98.173.159.xx1 = eth0 physical interface ==> eth1 192.168.1.1
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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
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98.173.159.xx7 = eth0:6 virtual interface ==> 192.168.1.60 ==> Network Attached Storage Server 1
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I 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.

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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.

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I've attached a HardInfo report which I hope could be useful if you need to know what my hardware is (an HP Pavilion zv5000 laptop).

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I'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).

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Apr 17, 2011

I set-up his mail server for him with Postfix but what he wants I have no idea how to do.

Essentially he wants it so that the mail gateway IP corresponds with the dedicated IP of the domain and I have no idea how to accomplish this.

I found some documentation on the web saying that the fix for this was to run multiple instances of Postfix which I tried doing but each time I try to start the second instance I get the error that postfix is already running.

There has to be an elegant way to make this happen, I really hate to tell a client something can't be done even though the concept is a bit pointless, IMHO. I am hoping I can get some feedback here on if this can be done and if it can the easiest way for me to accomplish doing it.

Here is some of the config files (example.com has been put in place of the actual domain names and the ip of 5.5.5.5 is in place of the actual IPs


Code:
[root@youronlinehosting ~]# cat /etc/postfix/transport
example.com smtp:5.5.5.5
example.com smtp:5.5.5.6
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[Code].....

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Aug 4, 2010

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Mar 15, 2010

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My machine that I am using is plugged into the DMZ. I have 1 ip address for the 1 network card. I have also added/bound 4 more ip addresses to that network card.

I have configured Postfix for Multiple IP Addresses.

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Ensure that I have my Network / Interfaces file and my Postfix's Master.cf/Main.cf files setup correctly?

How can I setup this server to be an Outbound SMTP server and get it to use all 5 of the IP Addresses to send these e-mails quickly?

What can I use to check and ensure that this server is in fact sending out emails on all 5 IP

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May 25, 2010

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acl manager proto cache_object
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acl Safe_ports port 210
acl Safe_ports port 1025-65535
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acl Safe_ports port 591
acl Safe_ports port 777
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http_access allow manager localhost
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