CentOS 5 Networking :: Multiple Static ISP IP Addresses / Servers Configuration

Mar 31, 2011

I 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

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Debian Configuration :: VirtualBox: Host-only Networking: Static IP Guest Addresses?

Jun 6, 2011

Debian Testing host, Winduhs XP guest. Winduhs is not allowed to directly access The Internets, and I am not setting up bridging as that makes it possible for the guest to mount layer 2 attacks on the LAN. I need for the guest to tunnel through the host without being able to see anything on the host, so it can then get access to The Internets, while being protected by iptables (Shorewall).

Used to be with VMware I had host-only set and the guest in a different class c (192.168.2.1) from the host (192.168.1.1) I turned on ipforwarding, set Shorewall rules, and it all worked. Now I have everything set with VirtualBox, and it does not work. Guest can ping its interface but not host. Host can ping vboxnet0. Host is supposed to masquerade guest's 192.168.2.1 through to the default out at 192.168.1.1, but it's not. I think a clue is in routing, but I don't know what's wrong.

[code]....

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CentOS 5 Networking :: Static Configuration For Wireless Card ?

Apr 28, 2009

I have a desktop PC with CentOS 5 installed, and a wireless card that's working well via NetworkManager.

How would I configure the wireless card statically, e. g. by editing /etc/sysconfig/network-scripts/ifcfg-wlan0?

This would be something like :

DEVICE=wlan0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.1.252
NETMASK=255.255.255.0
ESSID=my_essid
CHANNEL=3

But I don't know how to define the WEP key here.

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Debian Configuration :: KVM / One Interface / Multiple IP Addresses

Dec 27, 2015

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).

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 ?

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CentOS 5 Networking :: Rt61 PCI Wireless: Freeze Upon Shutdown With Static IP Configuration

Jun 24, 2009

I have one desktop PC I'd like to use as a jukebox. It's installed in the basement as a black box, with only SSH access, and it has got a minimal CentOS 5.3 install with MPD and NCMPC. It's connected to the hi-fi in the basement, so I can stream music to it when I'm downstairs. Since I didn't want to use cables everywhere, I bought a PCI wireless card, with a RT2561 chip.

Until recently this card worked OK with Linux. Recent kernel version even have out-of-the-box support for it, except of course you still have to download the firmware from the Ralinktech website.

I gave the thing a static IP configuration by editing /etc/sysconfig/network-scripts/ifcfg-wlan0, interface went up fine, I can ping the machine and SSH into it OK. Now the only problem is, when I do a shutdown -h now, the machine "hangs" while trying to bring wlan0 down. (In case you wonder: I temporarily attached a monitor to it, since wanting to know what goes on while shutting down in an SSH session is a chicken-and-egg situation :)). I actually have to hard-reboot it (by pressing RESET).

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Ubuntu Servers :: Setup An Outbound SMTP Mail Server With & Using Multiple IP Addresses

Mar 15, 2010

This is the current setup that we have: We have approx 20 clients who pay us to send out a type of e-mail called an E-Blast to their customers. We currently are using 5 Microsoft Windows Virtual Servers to do this. The problem is that those machines are starting to break down. There are times that it will take Microsoft Windows approx 9-10 hours to complete 1 job. This is way too long. We want to move away from Microsoft Windows for this particular type of job as it seems there are more customers who are wanting to use this type of advertising.

It seems that using a Linux Server "Command Line or Shell" environment would be the best way to go as there is no GUI like Windows. Since there is just text...that is something that would/should process very, very quickly.

I am in the process of setting up a new SMTP outbound mail server. This is the current software & configuration (what is installed on this new machine):

All of the customer data (Names, E-Mail Addresses, etc that these e-mails are going to) are currently loaded in a Microsoft SQL Database.

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.

I can, from the command line, send successful test e-mails and receive them in my personal account.

As far as I know everything is setup correctly. I can and will post requested information so that it can be verified that everything is setup correctly.

Here are a couple of my questions:

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

Addresses (I heard that there is a program named "Postal" that may help in determing this).

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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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CentOS 5 Networking :: Multiple NIC - How To Setup VMware Servers

Apr 15, 2009

So I have a pretty big networking nightmare on my hands right now. Stepped into the dog crap with this one, told my employer that I knew how to setup vmware servers right? Its not hard, install CentOS, install vmware, run the config tool, bridge the network, down the road we all go right? We have 3 servers running about 10 virtual servers.

Here is what we have all together.
CFU <- This is the internet. We have IP ranges xx.18.230 - xx.18.241 Gateway is xx.18.254 and subnet is xx.255.128
DELL PowerConnect 3348 Switch <- This is what everything is pretty much jammed into.
VMH1 <- This machine has 2 NICs
eth0 connects to the DELL switch somewhere on the upper 30+ ports
eth1 connects to the DELL switch on port 1.

It uses firestarter and is the gateway for our internal internet on 192.168.11.XX using IP 11.254. It has 4 vm's on it. One of them is the domain controller, hooked to eth1 using IP xx.11.1. The other one is a server for managing remote backups, it has an external IP linked to eth0 of xx.18.234. The other 2 vm's are for misc remote login stations that use internal ip addresses linked to eth1. It hasn't had a single problem communicating on either one of the ports..

VMH2 <- This server hosts a web server, and some other misc stations.
It hosts a web server on xx.18.230 and xx.18.231
It also hosts 2 workstations on a seperate network, through another router that is wireless....

Now, we have the problem child, VMH3
VMH3 <- This hosts...nothing. It sits and has a ton of storage, but does absolutely nothing, but won't communicate out either one of its network ports.
The xx.36.xx and xx.22.xx networks are there because we have multiple businesses in the building that shouldn't see each other.

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Ubuntu Networking :: Getting Dynamic Ip Addresses For Multiple Interfaces?

May 6, 2010

I 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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Networking :: DHCP Script - Assigning Multiple IP Addresses By Mac?

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.

So my question is: How do I add more of this mac related IP adress assignments in the dhcp.conf?

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Networking :: Forward Multiple Public Addresses With Iptables?

Jun 3, 2011

iptables 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.

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Networking :: Multiple IPV4 Addresses Not Working After Boot

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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CentOS 5 Networking :: OpenVPN Multiple Servers With Clients Access

Dec 27, 2010

what is the best way here? I have like 5 servers, and I want my clients to access each of them, so in case 1 server is down, they can access remaining servers. Also, it will work like user1 chooses the server number and is connecting to a central database, then reply is OK, and he can connect to the server number he wished.

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Ubuntu Networking :: Multiple External IP Addresses With Single Physical Ethernet Card And Virtualization

Feb 16, 2010

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.

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.

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Ubuntu :: 10.04 Static IP Addresses Using Network Manager?

May 2, 2010

I have four PC's in a home network setup, no server just peer to peer using ssh. I have tended to use wicd to set static IP addresses because Network Manager didn't always perform as I thought it should. Now that I have installed 10.04 I cannot see how to set static addresses using Network Manager so I installed wicd, and disabled Network Manager. After setting the address with wicd it shows that the computer is connected to the internet however I cannot get internet access, though I can network with my other computers. I've uninstalled and reinstalled a few times just to check that I haven't been careless but the results are still the same.

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Networking :: How To Determine Ip-addresses Of ISP's DNS Name Servers?

Dec 7, 2008

I am looking for a command which, when typed from the command line, returns the ip-addresses of the DNS nameservers that my ISP is using.I think is should be technically possible to write a program that does this, because linux installers set up /etc/resolv.conf correctly (as does knoppix). But I've been unable to find a command that does it. Is there one, and if so, what is it called?

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Networking :: Configure Static Ip For Removable Hard Drive Install For Use On Multiple Machines?

Sep 13, 2010

I am using Debian 4 bigmem and I set up static ip for my box. This is for a class and we will be moving the hard drives around the lab to different computers. My question is what do I configure to get Debian to be ok with my using different nics at different times. My first time I used it, I had eth0, but now I'm on a different computer (same type of hardware on all systems) but my nic is now eth1... And I had to set up static again for that nic. How can I have it just maintain a static ip for whatever nic/mac address on the computer that my hard drive happens to be put on?

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OpenSUSE Network :: Assign IPv4 And IPV6 Static Addresses?

Feb 19, 2010

How do I assign IPv4 and IPv6 static addresses permanently in OpenSUSE 11.2? Currently I am only able to assign either IPv4 or IPv6 static address not both. I cannot find even the interfaces file(/etc/sysconfig/network/interfaces).

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CentOS 5 Networking :: Add Further IP Addresses For Server

Mar 16, 2010

I'd like to add further IP addresses for my server but I don't get it. My steps :

[Code]....

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Apr 5, 2010

I'm running a dual boot system at work. I'm connected to a few shared drives in XP, and would also like to connect to them while using Ubuntu.How do I determine the addresses of the servers I'm connected (mapped) to in XP?

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Ubuntu Networking :: Setting Up A Static IP In A LAN And DNS Configuration?

Feb 13, 2010

how to set up a static IP from Ubuntu... Secondly, on some of the tutorials I read, there was something about changing the DNS server IP adresses. I do know what a DNS server is (Courtesy of www.howstuffworks.com ) but I don't understand why the DNS servers must be changed simply because I chose to use a static IP address.. (My PC connects to the internet via a router.. )

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CentOS 5 Networking :: Centos OS 64 - Development VM Image With Static Ip Address?

May 23, 2011

I am a developer, not a network admin - sorry if this ia dumb question. I need to test an application on CentOS 55 64 bit. The instalation went fine and initially I let DHCP work its magic. The router IP address ia 192.168.0.1 and all other VM's I have are granted dynamic ip address on this range (i.e. 192.168.0.x). However, the CentOS vm got an IP address that looks like it belongs on a different subnet :192.168.1.1

The VM (vmware desktop) network setting for this VM uses "Bridged: Connected directly to the physical network". I can ping the host (Windows 7 64 bit) and the host can ping it (it been the VM) - but no other computer on the network can see it. To make things easier, I changed the network configuration to use a static IP address. Here are my configuration files:

/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:0C:29:83:4B:A4
ONBOOT=yes
TYPE=Ethernet

[Code]...

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Networking :: CentOS 5 - Cannot Ping Win7 Addresses

Feb 10, 2010

I have a box at home that I've installed CentOS 5 on to. I'm new to Linux, so before connecting it up to the router I wanted to try and understand the network settings, so I connected it directly to my other PC with an RJ45 cable. From Windows 7 I can ping all known static IP addresses, but from Linux I can only ping the Linux addresses, not the Windows 7 one. Below are the TCP/IP IPv4 settings, all IPv6 settings are set to auto-assign.

Windows box (uses wireless connection for the router):
Local Ethernet Adapter
IP Address: 30.10.0.1
Subnet: 255.255.0.0
No gateway, primary/secondary DNS.

Linux box:
Three adapters:
Two onboard LAN, both configured to:
IP Address: 30.10.0.2 / 30.10.0.3
Subnet: 255.255.0.0
Gateway: 30.10.0.1
No primary/secondary DNS.

One LinkSys PCI card:
IP Address: 20.10.0.1
Subnet: 255.255.255.0
Gateway: 192.168.1.1 (my router)
Primary/Secondary DNS: my ISPs details.

The idea was to connect the box directly to the router (with RJ45) and to be able to remote login from my main PC to this one. This box is to be my home server, which I was going to put virtual machines on to for things like my development work and such.

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CentOS 5 Networking :: No Ping Response From SOME Addresses

Nov 21, 2010

I have strange issue on Centos 5.5 server.I have static IP address (192.168.58.2) on eth1 card and can't get ping response from some sites.PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

[code]....

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CentOS 5 Networking :: Multiple Nics With Multiple Gateway ?

Jun 16, 2009

I have a CentOS 5.3 box with three network interfaces in it. Each interface is attached to a separate VLAN and I want traffic to stay on each network segment.What I can�t figure out is why I cannot get each interface to have its own gateway and everything gets sent through the default gateway.The basically takes my possible 3Gb total bandwidth and throws it down a single 1Gb pipe.Then on top of that, if I take down the interface (ifdown) that has the current default gateway,I loose contact to the other two interfaces.When I look at the routes, each one of the interfaces shows the gw as 0.0.0.0 and defers to the default route. So I delete the route and try to add a new route with:

[root@testsan ~]# ip route add 10.1.15.0/24 via 10.1.15.1 dev eth2

but end up with the error:

RTNETLINK answers: Network is unreachable

[root@testsan sysconfig]# cat network
NETWORKING=yes
NETWORKING_IPV6=no[code].....

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Debian Configuration :: Multiple Virtual Servers Be Setup In 2 Desktops?

Jun 12, 2010

I now have 2 desktops running debian. I have virtual servers running in desktop 1, and I am hosting my photos using Gallery2. I have copied Gallery2 and the mysql over to desktop 2. I have entered port forward to desktop 1 using port 80 (using my router), and desktop 2 using port 1000. I can only access Gallery2 in desktop1. If I tried to access Gallery2 in desktop 2, I got re-directed to desktop1.

Questions:

1. Are home routers capable of port forward to more than one computers in a home network behind the firewall of the router? It is Belkin N+ router.

2. Can multiple virtual servers be setup in 2 desktops?

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Jun 17, 2010

I am working on a Debian 2.6.26-19 Distribution with exim4 as MTA. After a system restart a problem occurred with delivering emails to local addresses. These local addresses use a 1and1 mailserver for email. The MX records for the local domain are set correctly but exim does not use a DNS lookup for these addresses because it identifies them as local addresses. I figured this out by executing the exim4 -d -bt command. The dns lookup part of the result looks like this (I replaced the actual address with placeholders):

[Code]....

The eventual result of the exim4 -d -bt command is: [user]@[domain.ext] is undeliverable: Unrouteable address How can I make sure, that exim4 makes a DNS lookup for the local addresses instead of skipping it? I know that I have to edit a exim4 configuration file, but I could not figure out which and how.

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Oct 27, 2009

I'm having strange difficulties in setting a static ip for my CentOS 5.4 installation. If I use DHCP everything is fine, but with a static ip I have no network connectivity. I have done this many times with RedHat/Fedora/Ubuntu etc. with no problems and now I have no idea what I'm missing or doing wrong. I have tried to set ip as 192.168.1.20 (anything below .100 will do). GW is 192.168.1.1 and NM is 255.255.255.0. This is all I have had to use with other distros, but now when I set these I cannot even access my routers admin page or ping it (192.168.1.1). (I just did this with Vista on my other machine and all worked fine).

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May 23, 2010

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