Ubuntu :: Can't Ping Between Subnets?

Mar 10, 2010

2 ethernet cardseth1 IP Netmask (fixed address) Internet
eth0 IP Netmask (fixed address) LAN 01eth0:1 IP Mask (fixed address) LAN 02Lan 01 = Range ( ~ for 7 Stations fixed by mac addressLan 02 = Range ( ~ for 5 Stations fixed by mac address

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Networking :: Can't Ping Subnets - Vmware

Jan 15, 2011

Bear with me cos i'm just learning this stuff.

I've set up a couple of virtual networks with vmware workstation and experienced the same problem each time. I'll explain the one i'm working on now.

Machines -

Host - Slackware 13.1, VMware workstation 7.x.
VM1 - Vyatta (router).
VM2 - WinXP (client).


BUT I can't ping the XP client from the virtual router, and from the host I can't ping the virtual router.

Why is this?? I assume i've done something wrong but I don't know what.

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Networking :: Cannot Ping With Command - Ping IP - Address But Can Ping With - Ping IP -I Eth0

Jul 15, 2011

I am using an virtual machine. where I need to ping from one machine to another. earlier I was able to ping. But after going to google.com once, I cannot ping back to this machine.

But if I gave ping -I eth1 <IP> then I can ping.

I cannot install any package, so tell me solution which includes not installing any package.

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Ubuntu Networking :: Unable To Ping Over Wireless But Can Ping Over Wired?

Jul 24, 2010

I have two machines on this network, one running Ubuntu and the other running Fedora.

When I'm using the Wireless network on the Ubuntu machine, I cannot ping the Fedora machine. Everything else works. I can browse the net fine.

If I switch over to the Wired Network then I can ping the other machine.

I don't understand why ping doesn't work only over the Wireless. I can ping the router so I'm guessing it's getting blocked by the router but I didn't block ICMP traffic.

I tried asking on IRC and they ran out of ideas too to find out where the problem is.

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Ubuntu Servers :: Ip Ping Is Continuous, Dns Ping Is Discontinuous?

Aug 5, 2010

When i ping www.google.es, i get something like:Quote:

ping www.google.es
(wait 20 seconds)
64 bytes from icmp_seq=2 ttl:53 time=80 ms


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Ubuntu Networking :: Routing Between Two Subnets ?

Feb 16, 2011

I have a network routing problem that I need to fix using a PC with ubuntu installed.

Here are the details of my problem:
- I have two networks.
- The first network is an ADSL router with subnet 192.168.1.x. I do not have access to the router nor change any of its configuration.
- The second network has a subnet 172.26.x.x and connect via a wireless access point. Some of the devices connected to the network require to have static IPs.
- I have a PC with ubuntu installed and two ethernet cards: one connected to the first network and the other connected to the access point.
- I need to share the internet connection between the two networks using ubuntu. I already tried before on windows and the sharing worked when both networks were configured to use the same subnet. Once I changed the subnet of the second network, internet sharing stopped working.

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General :: Ping - Gives Unknown Host Error - Ping To LAN Address Works Fine

May 13, 2011

Even ping google's ip address doesn't work. unknown host error using backtrack4 able to browse net with these settings.

My network settings:

What's the problem with these settings...

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OpenSUSE Network :: Nmblookup Resolves But Cannot Ping Netbios Names Or Ping FQDN

Feb 23, 2011

This applies to my 2 opensuse PC's, my Windows PC is fine.I can ping a hostname, say "PC1" but I can not ping PC1.domain.local (even the host PC can not ping it's own FQDN). When I ping just the hostname the ping stats even list the FQDN.Onto the next issue, since all my PC's, have the domain prefix domain.local, my Synology can not. I can ping it's IP and that is it. I can resolve it's name with nmblookup just fine tho and that is what is killing me. How is this not resolving.Even weirder, I can browse to "Synology" in Network Servers under places on the slab.

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Networking :: Debian 5 - After SysCp Installation And Configure Ping Valure - Ping - Unknown Host

Jul 9, 2010

Ive got a problem on my server ....installed Debian 5 , Webmin and than syscp settung up syscp ready ....

I try to ping "localhost" ansver ping: unknown host
I try to ping "localhost." there is a host with IP

I need it to change it in "localhost"

Is that the bind9 maybe?

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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 :: Can't Ping Past Gateway / Can Ping Server From Outside

Apr 29, 2010

So, I have an Virtual Machine running CentOS 5.4. It sits behind a hardware firewall which also does NAT'ing. I've set up plenty of these, so I know for sure the firewall and NAT rules are set up correctly. From the host, I can ping anything in my subnet and the gateway. But I can't ping anything else beyond the gateway. I can perform DNS queries and when I try to ping, it finds the appropriate IP address.But from the outside, I can ping the PUBLIC address (It's a 1 public to 1 private address NAT, not 1 public to multiple private). I've tried it with IPTABLES on and off, with no change.

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Networking :: Ping Connection To Router OK But No Ping Between Boxes In LAN

May 26, 2010

I have Mandriva One 2009.0 ( on one box and Mandriva Free 2010.0 ( on the other. I can ping router ( from both of these boxes but I can't ping one box to the other and the other way around. What's going on?.

Do I have to change some settings in router?. Or is it firewall issue on those two machines?. Both of these boxes are connected by cable. Symbol of the router: TL-WR340G.

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Networking :: BIND9 SLOW Ping When Ping By Hostname

Feb 1, 2011

I just installed my first EVER bind DNS server. I am running bind9 on Ubuntu 10.04. Everything seems to be working great except one thing: If I ping a host that I have set up in bind by its HOSTNAME the pings take 5-6 seconds to reply/print to the screen between each echo response. If I ping by the host's IP address, they echo back very quickly.

I have read that IPv6 can cause this, but I have disabled it in /etc/sysctl.conf and the problem still exists.

I know everyone says this can't be a DNS issue, but this never was an issue with dnsmasq (which i was using prior), and it doesn't make sense that the ping are ONLY slow when pinging by hostname and not IP.

Configs below:

Ping by hostname - there is a 5-6 second delay between each one of the responses:


Ping by IP - the responses come VERY quickly one after the other:







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Debian Configuration :: Can Ping Public Ip But Cannot Ping Domain Name

Apr 6, 2011

I have a debian server installed with a static ip. Now i am able to ping my ip, but when i try to configure a domain name with the nameserver as my ip, i am not able to ping the domain name


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Networking :: Two Subnets Can't Talk To Each Other?

Jul 7, 2010

I have a firewall between two different subnets. The reason for the second subnet within the internal network is because I have a mail server that I want to protect. However, we need to make sure that the mail server can communicate with the internal network as well.

Mail server is
Firewall is and (and its gateway is to the router)

I go to another workstation and ping the mail server. I can't. It times out. I do the same from the mail server. It times out as well.

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Networking :: 2 Subnets Over The Same Cable?

Nov 27, 2010

I have a 2-floor house, with a single ethernet cable from the ground floor to the 1st. Downstair there is my ADSL modem, which is connected to the router upstair through this one cable. Now, I would like to have some more ethernet ports on the ground floor, but there's no room left to run another cable between the floors, so here's the big question: can I run both the modem-router connection and my regular LAN (which are on different subnets) through that one cable, with a switch at both ends?

To make it a little more clear, here is my present configuration


ADSL Modem ------- Router --- Clients

Here is what i would like to do:


ADSL Modem ---- Switch ------ Switch ----(WAN Port) Router --- Clients
Clients ---- ----(LAN Port)

Would it work?

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Networking :: Routing Two Subnets ?

Jun 26, 2010

I have two subnets which I am interested in connecting.

Some basic network details:

Subnet A:

Subnet B:

I am trying to think of any further relevant details, but that seems to be it to me. If I forgot anything, please tell me.

Ok the question. WHAT do I type? (Explicitly!) And WHERE do I type it? In order to reach ubuntu-01.tec.lan, or ubuntu-02.tec.lan from perpetrator.tec.lan or rapine.tec.lan?

I'm interested in using actuall ROUTES. I can already achieve results similair to this with either a NAT firewall, or with VPN.. but that's not what I am interested in.

From what I have found out so far, I should need something like the following:

On Gateway 1B:


And on Gateway 1A:


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Programming :: Bash IF Using IP Subnets?

Feb 14, 2011

I'm somewhere between Novice and I have no idea what I'm doing with bash scripts. I'm writing a script to deploy images using partimage on my company's desktops, and while I have just about everything else figured out I have one issue left.Each of our 4 sites that will be using this disc will have a deployment server due to the fact that our sites have dedicated point to point links that our business traffic is conducted on. I need to be able to determine what site I'm at based onubnet and set a variable based on this determination. What I don't know is how to get the IP address in to an if statement, and properly determine subnet. For example: - need to use DEPLSERV01 - use DEPLSERV02 - use DEPLSERV03

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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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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 done.how should the connection be made and what should be the configuration settings on the linux server.

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Networking :: Routing One Gateway To Different Subnets ?

Sep 3, 2010

Im having a issue with routing internet traffic from my router two different subnets (vlans).

Theres my setup:-


Both eth0,1 are running dhcp (two scoopes) that works fine!

The output of route -n is:

I have ip_forwarding on aswell, but i can ping the ip on the server running that dhcp scoope ie ping works great but i just cant get the internet on the clients.

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Networking :: Route 2 Subnets Between 2 Routes?

Oct 28, 2010

I have some CISCO,Linux related problem with 2 Class C subnets: -> PC5 -> PC6

Here's a picture of my situation: [URL]

HQ has to have 2 STATIC routes in order those 2 "PCs" mentioned above to have end to end connectivity with NETWORK A and NETWORK B. Now I try with

route0 -> network:, mask:, nexthop: Serial 0/0/0
route1 -> network:, mask:, nexthop: Serial 0/0/1

And it seems to work but I don't think it's proper! I feel it's kinda wrong ... but all my other attempts to set another couple of static routes ends in "Request timed out" and thus connection lost.

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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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Networking :: Determine How Many Subnets Are In A Network Range

Jan 12, 2010

I am trying to remember how to determine the number of subnets there are in a given subnet range. The example range is shown below:Quote: I did the binary conversions of the two addresses shown, the address that I got when comparing the two was the following:Quote: number of subnets I got from his was 63.Correct me if I am wrong, but is the number of subnets the difference between the number, in this case, the third octet and 255? If there is another, or correct, way of determining the number subnets what would it entail?

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Networking :: Configure Static Routing Between Two Different Subnets

Aug 25, 2010

In configuring static routing between two different subnets.

I have two different subnets as mentioned below:

I have a linux machine with two NICs on which i would like to configure static routing. details of the NICs are as mentioned below:

I have configured the gateway as on machines which fall under subnet and on machines.

My main motive here is i want communication to happen between both the subnets.

If the following modifications to route-eth0 and route-eth1.

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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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CentOS 5 Networking :: Adding Two Subnets To 1 NIC Port?

Sep 1, 2011

I have a server hosting with in a DC and I have two subnet on 1 VLAN. how can I add all the IPs from these two subnet in one go? lets say for instructional purpose they are and

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CentOS 5 Networking :: Ipsec - Get Access To All The Subnets?

Aug 18, 2011

Connecting two networks with ipsec on this manual [URL] The two networks are connected, everything works, the question is as follows: For a gateway to multiple subnets, I have access to only one subnet is listed in / etc/sysconfig/network-scripts/ifcfg-ipsec0 DSTNET = How do I get access to all the subnets?

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Networking :: IPTables NAT - Excluding Subnets For IPSec VPN

Feb 27, 2011

I have a Ubuntu 10.10 box which i've developed an IPTables Firewall script and is forwarding my ports correctly. This service also runs Openswan VPN Server with 2 VPN's, which is also working well.

I have come across a small snag with excluding the multiple VPN subnets I have from the NAT on this box.

I have the line in my configuration file:

-A POSTROUTING -o eth1 -s -d ! -j MASQUERADE

Which when added to IPTables does make the VPN come to life. But I can't seem to get it to add the second subnet. Unfortunately, I can't do a blanket exclusion such as because the second VPN is on a Class B subnet address which I cannot change.

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Ubuntu Networking :: Have Single Cable Connection To Switch Carrying Two Subnets?

Mar 15, 2011

how i can use VLANs. as i have red on the web, it is possible to have a switch to allocate ports to a single VLAN. thus splitting subnets on a port allocation. since i have a pc running KVM, it is possible to create multiple subnets for DMZ and LAN. thus my question is - is it possible to have a SINGLE cable connection to a switch that carries TWO subnets? so that i can decide how to distribute then on the pc?

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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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Networking :: OpenVPN - Different Subnets For Physical And Virtual LANs?

Jan 27, 2010

I have set up OpenVPN server using a bridged configuration. My networking "powers" aren't that advanced, so I did this by following the openvpn tutorial for bridged servers. I have tested this with several clients connecting to my server from different locations and it works very nicely (including broadcasts).

My server's LAN IP address is, and my LAN's mask is 24. Clients connecting to my server get assigned IP address that also fall within that subnet (i.e., the 192.168.2.x pool contains both physical machines in my home and "virtual" hosts). This is what the OpenVPN walkthrough specifies:


I was wondering if it would be possible for the VPN to fall within a different subnet (such as 10.0.1.x). I would also like to do that without adding another physical NIC to my server, or changing my physical IP address. I would imagine this is possible, since that's how hamachi does it.

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Networking :: (Debian) IP Traffic Shaping Based On IP/subnets?

Dec 27, 2010

We have a need to shape outgoing traffic EXCEPT to certain IP/subnets (sounds opposite to the title, but not really :P), using iptables if possible. We've had decent luck doing it with various things, but one of the big problems is the decrease in download speed (which DOES NOT need to be shaped at all) due to upload shaping. ie, we want the shaping not to apply to TCP/UDP overhead. Semi related but probably not important is the ability to shape virtualised systems as well (ie the guests), but as the guest traffic goes through the host any traffic shaping done on/to the host should affect the guests as well.

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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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OpenSUSE Network :: Mount NFS Share Folder From Diferent Subnets?

Sep 13, 2010

I tried to mount a NFS share folder from another subnet. The NFS client on my SUSE 11 server could not detect it. The folder is in a different subnet. Is some one know how to make it work?

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Networking :: Dhcpd3 Doesn't Assign Proper Addresses To Vlan Subnets

Oct 22, 2009

I have dhcpd3 running but it does not seem to properly use my vlan subnets to assign addresses.

I have eth0.10, eth0.20, eth0.30, eth0.40, eth0 all declared with proper ranges, subnets and gateways.

If request an address in on eth0.30, I would think that it should use the range associated with this subnet (ie eth0.30 is and this is setup in dhcpd3, but this is not the case.

It seems to use the first declared subnet instead. If I comment the first subnet out, it uses the second one properly.

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Networking :: Can't Ping Localhost But Can Ping Others On LAN

Sep 15, 2003

I installed Mandrake 9.1 and am having a strange issue. I set the linux machine to get its IP address from my router's DHCP server. I set the router up so that it always hands the same IP address to the linux machine. Now the linux machine gets the IP address from the router and I can browse the internet and ping any of the windows machines that I have on the network using their IP address. Having setup Apache and proftpd, I can go to a windows box and http or ftp to the linux machine, but I can't ping it. From the linux machine, I can verify that it has the IP number that I wanted it to get from the DHCP server, I can browse the internet and ping the other boxes, but I can't get a response from pinging localhost,, or the IP that I know its using from the DHCP server.

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Fedora Networking :: Xp Can Ping 10 - But Can't Ping Xp

May 21, 2009

I have connected xp and fedora through crossover cable . xp has ip address (manually assigned) fedora has with default route equal to

I can ping fedora from xp computer but i can't able to ping xp from fedora computer.

I have manully edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file with correct subnet mask and ip address because when i tried to give ip address manully in network manager the subnetmask is replaced with gateway address don't know why.

Now i want to share internet through crossover cable . xp is connected to internet through wireless usb adapeter.

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Debian Multimedia :: Use The "ping -a" Command For Getting An Audible Ping

Jul 8, 2011

I try to use the "ping -a" command for getting an audible ping. But there is just silence The command "beep" works fine, so everything should be ok with the speaker (in the konsole).

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Networking :: Ping Using PHP Exec("ping -n 1 $ip",$output[],$retval)?

Apr 23, 2010

I try to ping with php : exec("ping -n 1 $ip",$output[],$retval); it works fine in window. but in linux i got this error : ping: icmp open socket: Operation not permitted are there any ways to solve this ?

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