Networking :: Server On Multiple VLANs Server Not Responding To Pings From Non-local Subnets?

Jul 14, 2010

I've got a machine running Ubuntu Server that is on several VLANs. Each VLAN has its own subnet and the server has an address on each subnet. The switches are set to allow tagged traffic to the server for each VLAN that it is on. Switch ports ending with workstations are given untagged ports on whatever VLAN is appropriate. Workstations are given addresses on a subnet for each VLAN via DHCP. All this works great and hosts on any subnet/VLAN can access the server as normal via its address on that subnet/VLAN.

Accessing the machine by its address on a non-local subnet is where I run into a problem. Inter-subnet traffic has to go through a router, which has been set up appropriately. Running tcpdump on the server and pinging it from a workstation on a subnet, using its address on a different subnet, shows the server receives the ping, but sends no response:

sudo tcpdump -i vlan4 -n
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode


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Networking :: Connecting Two Subnets Via A Server?

Mar 3, 2011

i have two subnets with different gateways.i am thinking of connecting them via a linux server which would enable them to communicate.but i dont know how to proceed for getting this should the connection be made and what should be the configuration settings on the linux server.

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Networking :: Dhcp Server With Two Subnets?

Mar 17, 2010

I'm trying to build a linux(fedora 12) dhcpd server(and gateway), that have 3 network cards(eth0 have with public ip, eth1 class and eth3 with class).

Because I have just a switch, I want to put both cables(from eth1, eth2) in the switch. Every client has 2 network card(eth0, eth1). My question is, is there any way to conf eth0 to take from server ip from class, and eth1 from The internet will work only on eth0.

my dhcpd.conf for now looks like this:

subnet netmask {
option subnet-mask;
option routers;


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Ubuntu Networking :: Bridge Two Subnets With A Server?

Nov 2, 2010

I have a Ubuntu server with multiple NICs and I'm just thinking about a potential scenario that might come up soon.

Imagine I have a network on floor 1 with an independent cable connection to my Ubuntu server -> switch -> assorted devices, on the subnet 192.168.0.x Now imagine friends upstairs have another independent network with cable -> router -> assorted devices, on subnet 192.168.1.x.

How can I set up my server to provide access for the 1.x subnet to the 0.x and vice versa. Ideally the devices all access internet from their appropriate subnet. I've read something about bridging, is this what I need?

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Networking :: NFS Server Serving 3 Subnets And Routing ?

Apr 23, 2010

I have one main subnet with a defaultrouter 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 and The clients on those new subnets should also be able to access the internet (through the router 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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Networking :: Pinging Multiple Interfaces - Getting Pings From Eth0 But Not From Eth1?

Feb 26, 2011

I 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 netmask up
ifconfig eth1 netmask up

But I am not sure if it will ping both the interfaces if I issue a command

ping -I eth0 (machine in network)
ping -I eth1 (machine in network)

I am getting pings from eth0 but not from eth1

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Networking :: Configuring 2 Nics To Talk To Two Different Subnets On A Sles10sp3 Server?

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 network routed through router setup as our management vlan , and with router as our lan for general users. Where server ips are nic1 and nic2 My workstation would be If I ping the server at
I get no response. If I ping the server at 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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Networking :: Use Multiple Dhcp Subnets On Single Machine?

Dec 13, 2010

I am find myself in need of building what amounts to 3 ip networks on 1 physical lan.

first LAN is another companies network on the network a mix of pc's and equipment

second is LAN new company network

third network is an ip phone system for both i would like to use

i am hoping to use the same dhcp server to do this, assigning address to the old company's 10. network via mac address reservation.

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Ubuntu Multimedia :: Pulseaudio Server On Multiple Computers In Local Network?

Dec 5, 2010

I will cut to the chase. I am running three ubuntu computers on my local network:my desktop which runs ethernet, and two laptops which run wireless on the same network, and all from the same router. For purpose of this thread, I am concentrating on this one issue with pulse(assuming its pulse doing this). When I have two computers running at the same time, or even all three, I can hear bursts of sound coming from the other computer, not all the time, but consistently. I don't know what is causing this. I've searched hi and low in all ubuntu pulse audio forums and those mentioning pulseaudio and I have not seen this issue posted anywhere. Most threads deal with issues of not being able to get pulse to recognise audio from one computer to the other...mine is just the opposite...I'M TRYING TO STOP THIS FROM HAPPENING!...... If I'm listening to my music on my desktop, I don't want to hear what my son is playing on his laptop...and vice versa. all the computers at my home are running lucid lynx, latest updates and latest approved kernel as of the date of this post. 2.6.32-26-generic.

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Networking :: Kernel:Nfs Server 10.xx.xx.xx Not Responding

Dec 14, 2009

I am getting an var log error while mounting remote file system to the client side as:- Kernel:NFS: Server is not responding, still trying.

The issue is client side machine is getting hang, after i mount the file system.

I have exported the file system as ext3 at the server side using Veritas Cluster. And importing it on the client side by including the shared directory in fstab.

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OpenSUSE Network :: Configure My Server For Routing Between Vlans ?

Jul 29, 2011

I'm trying configure my server for routing between vlans, but I'm having troubles with my server after that vlans are set. I can create vlans and routing is OK, but when I trying remove a vlan, restart the network script or restart the server, the CLI freeze and then I can't do anything. Even Ctrl+C or Ctrl+Z isn't work. I can use other terminal or do other SSH connection (if the network interface used by ssh isn't crashed), but if I try use a ifconfig per example, crash again. The unique solution is restart the server. Nothing about this is found in the log.

Opensuse 11.4

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Fedora Networking :: LTSP - NFS Server Not Responding?

Feb 12, 2009

Currently have a problem with my LTSP server when using a gigabit switch with a megabit thin client.I am using K12LTSP with Fedora 9.The thin clients get most of the way through booting up then I get error messages saying:nfs: server not responding, still trying.I don't get this problem if I use a 100 meg switch though.I have found several forum posts on the internet which all seem to point to the following webpage with a solution:However, when I make the recommended changes It doesnt make a difference.Below is an example of the default file located at /var/lib/tftpboot/ltsp/i386/pxelinux.cfg with its default settings:

prompt 0
label linux


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Fedora Networking :: Server Is Not Responding To The Traceroute Command

Aug 10, 2011

As i've installed the new fedora update packets ,i've seemed to develope a strange networking problem .. Network description Fedora 15 with 3 LAN adaptors eth0 > LAN (IP address > network connected to a pppoe conection eth2 > WAN to another provider. Ok so let's ignore eth2 because i've disable mangle(i was using trafic shifting on some ports). So now i'm using it as a simple NAT server .. so the problem is : >>my server is not responding to the traceroute command is it should .. the network works thou but this is what i get. C:UsersDUAL>tracert


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Networking :: DHCP For Diskless (PXE) Boot - Server Not Responding

Jan 7, 2009

I'm attempting to set up a server for performing diskless boots here. I'm using Gentoo 2008, and have followed the instructions here:


I've gotten to the end of the basic DHCP setup, and I can not get the server to issue addresses. I've confirmed dhcpd loads up OK, and is running in top.

Here's the contents of /etc/dhcp/dhcpd:

# Disable dynamic DNS
ddns-update-style none;
# Assume one default gateway for IP traffic will do


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CentOS 5 Networking :: Bind Server Not Responding To Client Queries

Mar 4, 2011

I am bit new to Linux and have setup caching-only name server with Centos 5.5. when i do dig server, it provide resolutions. but when i use the server IP as DNS on my windows client, it says, "connection refused" on the NSlookup output. (IP table didn't enable) My server Ip is and bellow is the configuration of "/var/named/chroot/etc/named.conf"

options {
listen-on port 53 {;; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt"; .....

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Ubuntu :: Reverse Proxy Setup - Pass Multiple Domains Thruough One Server To Various Hosts On Local Network

Apr 13, 2011

I'm trying to pass multiple dpmains thru one ubuntu server to various hosts on my local network.

[url] should be sent to the /var/www folder on the local host.

[url] should be forwarded to an IIS box on my local network (owa.nunya.local)

[url] should be sent to another ubunto box on my local network (

I have tried placing VirtualHost entries in /etc/apache2/sites-available/default and [url]and [url] both work but [url] gets forwarded to the c:inetpub folder on the IIS box.

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Debian Configuration :: DHCP For Multiple VLANs

Feb 7, 2016

I'm trying to setup a DHCP server that serves several different VLANs, we have 5 in total. Our network is working correctly, with static IPs, we're able to ping across without any issues.

When I connect my debian box to an interface on VLAN5, statically assign an address in the correct range, it works. Similarly with all other VLANs.

To configure this box as a DHCP, I set one of the ports on the switch as trunk, connect that to the debian box to allow all VLAN traffic to reach my debian box.

I setup DHCP following the steps on [URL] ....

Then I configured different VLANs by following the steps on [URL] .....

However, with the vlans setup, I am unable to ping anything. This is essentially what I did.

Code: Select allSet the port on the switch to trunk with 802.1 encapsulation
disable eth0
vconfig add eth0 5 # to add vlan 5
ifconfig eth0.5 netmask up
vconfig add eth0 5 # to add vlan 10
ifconfig eth0.5 netmask up

[Code] ....

I do not know why I am unable to get any connectivity through my VLAN interfaces.

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Fedora Servers :: Iptables NAT To Multiple Vlans?

Mar 26, 2009

I have eth0 for administration, and vlans eth0.2 eth0.3 and br0 for resource seperation. My esternal interface is ra0.each internal interface is on a seperate subnet, and I have dhcpd giving connecting devices ip addresses out of their assigned network. I want all of the devices to be able to access the internet through NAT, I need to allow them to communicate with port 80 on eth0's subnet



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Server :: Deadlock In NFS4 / Shared Servers Suddenly Stop Responding And Cant List It From Debian 5 Server?

Jan 4, 2010

I am connecting servers using NFS4 the shared directories are on servers running Debian 4 while the one who read from them is Debian 5.0.3. The problem is one of these shared servers suddenly stop responding and you cannot list it from Debian 5 server, also df hang, and the web application that is using it does not respond to requests that use this shared directory since it is blocked. Then the load on the server start to increase until the server cannot respond (over 90). I have found many entries in the syslog that refer to this like:

ma25555 kernel: [1200285.732919] nfs: server not responding, still trying
Dec 31 08:16:33 ma25555 kernel: [1200289.815378] INFO: task java:9702 blocked for more than 120 seconds.
Dec 31 08:16:33 ma25555 kernel: [1200289.835249] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

I have tried the connection between the 2 servers using ping for one day and all are OK (zero lost)

There are 3 other servers that are running Debian 4 and are working fine.

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OpenSUSE Network :: Config Files For Multiple IP's On VLANs?

Jun 10, 2011

How can you do it with individual ifcfg-* files?

I've tried adding them like this:

Filename: ifcfg-vlan1:0

but it fails on ifup, thinking it might be the filename (the vlan tagging being picked up from the name) I tried renaming it but still no go.

I can add IP's via ifconfig, eg ifconfig vlan1:0 netmask up

and I'm pretty sure I could add multiples to the ifcfg-vlan1 file but how do I add them from individual config files?

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Server :: Nfs: Server - Not Responding - Double Mounted Filesystems?

Aug 23, 2010

I have problems with nfs. There is an old legato cluster Automated Availability Manager on Linux. And lately we noticed problem with nfs

in the logs there are still entries:

I tried to add more threads in /etc/sysconfig/nfs but it didn't help.

And on one node there is info regarding double mounted filesystems with df -h command. Why? In /etc/fstab is only one entry.

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Debian Configuration :: Massive Delay Between Pings Yet Pings Fine

Aug 16, 2010

I have just installed a testing net install of squeeze on my laptop and I'm having a few problems with my wired connection.

When i try to ping there is a large delay between each result even through the actual ping takes ~30ms. It takes about 5 seconds or more between each ping.

If i use ping -n it works fine. Does anyone know why this is happening?

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CentOS 5 Server :: Server Goes Non Responding State?

Dec 8, 2010

5.5 (64bit). My server goes into non responding state where I can't telnet, ftp or ssh server whereas PING is the only thing which works at that time. I need to hard reboot server to get it back online. This is happening very frequently in fact yesterday and today server went inaccessible. which log file should I look into to find out the reasons of this inaccessibility?

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Ubuntu :: Internet Gateway Server - Subnets Or DHCP

Feb 5, 2009

What I need is some information to be studied and learned by me in order to be able to create with Ubuntu Server an Internet Gateway Server. From my ISP I get about 50 public routable IPs through DHCP. Into my LAN I need to forward this public routable IPs to machines but I want to be able to manage bandwidth and also to be able to enable or disable Internet access for every client machine. Maybe with subnets? Maybe with dchp really? It would be nice if it would possible through DHCP!

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Server :: Create A Webhost On An Running Fedora Server Which Runs Multiple Webpages + A Coldfusion Server?

Sep 29, 2010

have to create a webhost on an running fedora server which runs multiple webpages + a coldfusion serveri have to add an coldfusion virtual host to these.what i would do:*crate a new user & group*enter vhosts.conf and copy an existing host and modify it for the new one.*create an new folder and copy the main files (phpstarter and webroot) *chown the files for the right useri think an apache graceful would be needet

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Networking :: Local Smtp Server And Smtp Server Of Domain Registrar Simultaniosly?

Nov 27, 2008

I have a domain name registered in, they provide email service also, can i use local mail server and registrar's smtp server at same time?

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Server :: Server Goes Non Responding State ?

Dec 7, 2010

I am using CentOS 5.5 (64 bit) on a Quad core server having 8 GB RAM. This server has MySQL server 5.1.47 installed. THis server goes non responding state after every 20 to 60 days. SSH, telnet doesn't work at that time however PING works fine. I have to hard reboot the server to get it back on track. Can anybody let me know what logs/files should I look into to find out that what happens to the server when it went to non responding state?

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Networking :: Specify Hostname (in Local Box, Not In DNS Server)

May 31, 2010

What is the right way to specify hostname(in local linux box, not in DNS server):


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Ubuntu Networking :: Can't Ping Local DNS Server

May 28, 2011

Last night I setup bind9 on my server. I created a local domain (name.local). The server's ip address is

The issue that I'm having is that with my ubuntu laptop, I can't ping the name of the server.

user@prefect:~$ ping name.local
ping: unknown host name.local
But when I do the same ping from both the server and a XP computer, it will respond.

I can ping the laptop with it's name ( from both the server and the xp computer.

This is my /etc/resolv.conf file:

user@prefect:~$ cat /etc/resolv.conf
domain name.local
search name.local

Also, when I do nslookup name.local or dig name.local, the return with no errors.

Why is it that I can't use the name of the server to access it and that only the ip address works?

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Networking :: Connect To A Nfs Server On Local Network?

Sep 6, 2010

I am trying to connect to a nfs server on my local network ( the server is a fedora 12 box ) using slackware 13.1 but I am having some problems. First of all I am sure that the server is configured ok and my desktop can ping the server but when I try :

mount -t nfs /home/usr/tmp I get the following error : mount.nfs: No route to host

And when I try to rpcinfo -p I get the error :

rpcinfo: can't contact portmapper: RPC: Remote system error - No route to host

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