Networking :: Centos Cannot Ping Hosts On The Same Subnet After Change To Static Ip

Jul 26, 2011

I am using centOS 5.0. After I change from DHCP to static IP address, I cannot ping hosts on the same subnet. The error message says destination host unreachable. Before I made the changes I was able to ping and now even I change it back to DHCP I still cannot ping with the same destination host unreachable message. The centOS is running on VMware on a Windows host.

ifconfig shows

eth0 Link encap:Ethernet HWaddr 00:0C29:A1:9A:10
inet addr: Bcast: Mask:
inet6 addr ......

After pinging (106 is on and other host can ping it), arp -a shows ? ( at <incomplete> on eth0 I tried different ways by disabling the firewall and and disabling SE protection. No Luck.

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Networking :: ARP Does Not Resolve MAC Address Of Hosts On The Same Subnet?

Jul 26, 2011

I just changed my CentOS server from DHCP to static IP address. After the change, I cannot ping other hosts on the same subnet. (I can ping the CentOS itself).The IP address of CentOS is pinging (106 is on and other host can ping it), arp -a shows? ( at <incomplete> on eth0 It looks ARP cannot resolve MAC address of hosts

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Networking :: DHCP - Creating Multiple Subnet Pools For Different Hosts?

Jul 16, 2010

I am trying to configure dhcpd to provide two different pools of IPs- one for dynamically named hosts specific to MAC addresses, and another for everyone else.So, a machine with X MAC address connects, gets an IP from e pool, and the server updates DNS with the address under a specific hostname.For the other pool, it just assigns the IP, no DNS updates.The "class" function doesn't appear to allow anything but pattern matching, and I can't find anything that specifies what "allow" and "deny" options therere for the pool command.Here's my config so far - will this do what I want?

key dhcpd {
algorithm hmac-md5;


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Networking :: Cannot Ping To Machine From Another Subnet?

Apr 23, 2010

I installed apache2 on my Ubuntu machine and I am trying to access the server from another subnet. The server is connected using ethernet and has a static ip address. I can ping from the server to any machine in the other subnet but non of the machine on that subnet can ping the server. iptables does not seem to be running


# service iptables status
iptables: unrecognized service

and its rules are


# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination


What is preventing my machine from being accessed from the other subnet?

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Fedora Networking :: Can't Ping Some Hosts?

Jun 25, 2011

Not sure what iis going on, I can ping some hosts on the internet but not others see below (adobe is not the only example) Works OK from another host on the same network with same GW and DNS iptables is turned off

[root@havoc init.d]# ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_req=1 ttl=55 time=94.1 ms
64 bytes from ( icmp_req=2 ttl=55 time=93.0 ms
64 bytes from ( icmp_req=3 ttl=55 time=99.4 ms
64 bytes from ( icmp_req=4 ttl=55 time=96.8 ms


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Networking :: Wireless Hosts Do Not Return Ping

Jul 21, 2010

The wireless connected hosts do not respond to pings from wired ones or other wireless ones. And all the wired connected hosts respond to pings from any wireless one. The same problem applies also to ssh connections exactly as in the ping issue.

The switch the ADSL modem/router and the Access point are all 3 different machines correctly connected to each other. I do not have a firewall in any of my hosts, all run Slackware 13.1, the wireless ones use "wext" driver and not "ndiswrapper". All wireless hosts login successfully, WPA & DHCP works fine and internet connection goes without a problem. But the fact I can only connect from a wireless host to a wired one is puzzling.

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Fedora Networking :: 14 And Hyper-V - Can't Ping Or Connect To Other Hosts

Nov 11, 2010

i'm running some virtual Fedora installations on a windows server 2008 with hyper-v. Most of them are Fedora 12 and 13. Everything works fine for some years. Yesterday i want to upgrade a F13 machine to F14 by netistall. The upgrade ran without any problems. After the reebot the machine was off the network. All the networkconfigs by DHCP are OK, IP address, gateways, DNS settings and so on. But the machine can't ping or connect to other hosts. I tried an VM from scratch with both F14 i386 and x86_64 - same ****. This is the first time i had such a problem by upgrading Fedora machines.

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Networking :: VMware Duplicated Ping Responses From Hosts In Same LAN

Nov 20, 2010

Host machine is a "2.6.32-24-generic-pae #38-Ubuntu" and VMware Workstation version is 7.1.2 build-301548.In addition to those three IP addresses(, and seen on a drawing, there are four identical virtual machines inside the machine. Virtual machines are named Olive0-3. Olive0 has IP address, Olive1 has, Olive2 has and Olive3 has

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Networking :: OpenVPN - Can't Ping From Server To Client Side Hosts / Make It Possible?

Mar 20, 2009


What I can ping
Host A -> Host B
Host B -> Host A

Host A -> Router B
Host B -> Router A

Host A -> OpenVPN B
Host B -> OpenVPN A

VPN Server -> VPN Client
VPN Client -> VPN Server

What I can't ping
VPN Server to any client side host local address
VPN Client to any server side host local address

I have searched and searched for this but can not find any answers. Why can I not ping Host B from my OpenVPN server?

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Ubuntu Networking :: Server: Dhcp - No Static - Cannot Ping Router ?

Dec 9, 2010

Fresh install of 10.04.1 server; installs seamlessly; finds network no problem.

However, establishing static connection is driving me batty. Will not take. I've reconfigured "interfaces" file several times. My fingers are numb ifdown-ing and ifup-ing and /etc/init.d/network restart-ing.

I have two files in /etc/network ... interfaces and interfaces~ (one static and the other dhcp). I can switch them in and out of play. The dhcp works and pings out like a champ. static is dead, just dead. Cannot ping router ... nothing.

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Networking :: VLAN With 2 Router And 2 Subnet - Is Device In Different Subnet Works

Jul 22, 2011

I have TWO L3 + router switch (say switch1 and switch2). I created VLAN100 with VLAN ID 100 in both the switches. I created router in Switch1. I created router in Switch2. Switch1 is connected with 1.x/24 PCs. PCs are configured with 1.1 gateway. Switch2 is connected with 2.x/24 PCs. PCs are configured with 2.1 gateway. Both Switch1 and switch2 are connected by a trunk to carry VLAN100 data.

1)I have few PCs of 1.x connected to say Switch1 Is it possible for PC with IP to ping PC with IP are the configuration required in both switches to make them communicate ? All the device in both the subnets should ping/communicate with each other.

2)Move PC ( to switch2. Move PC ( switch1.What will happen when PC(1.100) ping (2.100) and vice versa?What will happen when PC(say 1.80 in switch1) pings PC (say 1.100 in switch2) and vice versa? What will happen when PC(say 1.80 in switch1) pings PC (say 2.100 in switch1) and vice versa?

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CentOS 5 :: Change To A Static Ip?

Jul 23, 2011

how do I change my to a static ip?

I went into nano /etc/sysconfig/network-script/ifcfg-eth0

I add in IPADDR=

I do service network restart and it doesn't change to the correct.... ip ??

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OpenSUSE Network :: Ping Between Two Guest Os On Two Different Subnet Masks

Mar 15, 2010

Step 1 : In Hyper-v Machine i have created two Virtual Ports.

Step 2 : Now for these two diff ports two ip address with different subnet mask(e.g and been assigned(and have checked using ifconfig).

Step 3 : In Host machine i have added one subnetmask for one machine next one for another machine,however i m not able to ping both the ports from either of the machines having static ip or having ip

Step 4 : If i add same subnet mask for both machine it is pinging properly between 2 machines.

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General :: Ping Two Ethernet Card On The Same Computer And On The Same Subnet

Jul 6, 2011

I have two NIC Ethernet card (eth1 and eth2) on the same computer (linux) connected by a cross cable.

The two interfaces are on the same subnet :

eth1 :
eth2 :

Then i add a route for each interface :

route add -net netmask eth1
route add -net netmask eth2

Finally,i'm trying to ping :

ping -I eth2 or ping -I eth1

Ping command reaches error : Destination Host Unreachable

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CentOS 5 Networking :: Multiple NICs On The Same Subnet?

Mar 30, 2009

I have a motherboard which has 4 x 1Gbps Ethernet controllers. I would like to use it as a Gateway for my home network. I have a static IP from my ISP which I can use to configure eth0 (I haven't done it yet as the LE-565 is currently sitting behind my Netgear router until I've got DHCP working). I would like to use eth1, eth2 and eth3 for my LAN. How do I set things up so that DHCP is handing out IP addresses on the same subnet ( on all three interfaces?

P.S. I think what I'm asking is: how do I combine all 3 interfaces to behave like a switch (ie. just like my Netgear router)?

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CentOS 5 Networking :: VLAN And Gateway Outside Of Subnet?

Jan 12, 2011

My company hosts five Servers with CentOS 5 installed in a Data Center. The Data Center assigns a VLAN to each customer so that they can organize customers and also count traffic. The VLAN assigned to my company is in the form 62.103.X.X with a subnet mask so the IPs that we can use in our Servers are 13. The first IP in the VLAN (for example is the Gateway and the rest, that are calculated from the subnet mask, are assigned to servers( up to

The problem I have is that we have run out of IPs in our VLAN. We have used all IPs and we want some more. The Data Center can assign new IPs but not grow our VLAN IPs by expanding the subnet mask. So they gave us a new VLAN with some IPs (for example 62.104.X.X with a subnet mask They told me that I had to use as gateway the gateway of the first VLAN and assign the new IPs as usual. So I assigned to one of the CentOS 5 servers the IP and set the gateway to Unfortunately this did not work and we could not establish connectivity to the Internet.Is it possible to assign a gateway outside of the IPs that are in the subnet? Could it be a problem with the VLAN setup by the Data Center?

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General :: Writing A Command (for Loop) That Would Ping A Class C Subnet?

Nov 4, 2010

how to write a command (for loop) that would ping a Class C subnet to make it so that it only replies once and does not show the statistics?

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Networking :: Can't Browse Computer Of One Subnet From Another Subnet

Jul 4, 2011

I installed Redhat Enterprise linux server5. it has two LAN card and two subnet connected to these two LAN card. i can browse network from these two network easily. But i created VLAN on one network card.Now i cant browse network from these VLAN subnet.

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CentOS 5 Networking :: Public Subnet Is Not Accessible From The Internal Network

Aug 6, 2010

I will try to explain a bit first about my network typology: I have one cent os 5.5 machine with 2 nics - external one 86.x.x.122 and internal one with 2 IPs: and 89.x.x.121. The ideea is that I have a public subnet (86.x.x.120/29) of IPs which are routable only through 86.x.x.122 so I have a webserver hosted on a different machine with the IP of 89.x.x.122 and GW 89.x.x.121 - everything works perfectly fine, except that I cannot access from the internal network / 24 the so called DMZ (roughly) - the 89.x.x.122.

What really makes me crazy is that I setup the IPtables rules correctly because I can access the webserver from the outside world but I cannot accessit from the internal network...

what I'm missing - why the cannot see the 89.x.x.122 machine... What IPtables rules should I add?

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CentOS 5 Networking :: DHCP Multi-Subnet From Single Server?

Oct 24, 2010

I've got a bit of a question. My network is laid out like this:

The role assignments are thus:

Firewall - sorts out the passing through to the 3 different networks, and acts as the traffic proxy.
Windows 2003 server - Does Active Directory and DNS
CentOS server - FTP and DHCP

Now, my problem is I need the CentOS server to be able to assign IP address to both networks, however, the CentOS server can *ONLY* be connected via the one interface to the firewall. It needs to assign the Windows 2003 server and the eth0 of the firewall an IP address via static DHCP, but it also needs to able to assign the clients dynamically via any address in the range. I was thinking that I would be able to create static only assignments for the servers via their MAC addresses, and only have 1 dynamically assignable entry for the clients, and then get the firewall to allow ports 67 and 68 to flow freely between eth0 and eth1, but I wasn't entirely sure of the best way to do all this.

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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 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 :: Change Hosts File By Network Connection?

May 11, 2010

Is it possible to have different /etc/hosts file for different network connections without having to go in and change it every time? The why: I have dyndns and port forwarding to get to my desktop. My laptop is sometimes on the same network, and sometimes not. Also, sometimes the dyndns doesn't update properly, or the outside connection is down, but I want to get to my desktop (and I'm too lazy to walk up the stairs). I'd like to be able to keep one set of bookmarks, ssh command aliases, etc. that would always get to it the fastest and most reliable way possible.

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Programming :: Ping Hosts From Database?

Apr 26, 2011

I have a php scriptI want it to ping list of ips from a databse(using fping) and based on the status of the values to put them in a field(status) into the database(0 if down,1 if up)i executed tghe script and it gives me this error:Thread 1 - 17:51:01 26-04-2011 alive Couldn't execute query.I cant see what 's wrongthis is the source of the php script:

$connection1 = mysql_connect($h, $u, $p) or die("Couldn't connect.");


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Networking :: Change Dynamic Ip To Static Ip?

Feb 11, 2010

Fedora 12 64bit What will be the correct steps changing dynamic IP to static IP on F12 console, instead of on Gnome running;

System -> Administration -> Network -> Edit, etc.

I made following test;

Edited ifcfg-eth0
$ cat /etc/sysconfig/network-scripts/ifcfg-eth0 Code: # Attansic Technology Corp. Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller


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Ubuntu Networking :: Change Subnet Mask "ONLY", Without Touching Any Other Setting?

Apr 5, 2010

I am using ubuntu Lucid and connected to a network with windows machines.Our network admin changed some settings in the network, and all machines need to change their subnet masks to access local machines (e.g. I am getting "unable to mount" message when I try to connect other Windows PC's on the network.)

If I open the connections panel, and "Edit" the "Auto eth0", I can get: IPv4 Settings -> Method -> Manual -> Addresses -> Add .And I am pretty sure I will put new subnet mask address into "Netmask" box, what to put others? Namely:

IP Address, Netmask, Gateway and below:
DNS Servers, Search Domains

I can get some info about my network connection by right clicking network icon on the panel, and select "Connection Information" Tried to fill manual settings with some of those info (the ones made some sense to me) but I still cannot mount windows network drives, plus my internet connection dies.So, is there any way to change Subnet Mask "ONLY", without touching any other setting.

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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 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 :

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:



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Fedora Networking :: Change Dynamic IP To Static IP?

Feb 11, 2010

Fedora 12 What will be the correct steps changing dynamic IP to static IP on F12 console, instead of on Gnome running;


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Ubuntu Networking :: Change To A Static Ip Address?

Apr 11, 2010

I have followed some instructions to change to a static ip address and have now lost my connection to my router. The mistake I made was not copying the original "interfaces" file before making changes.The file originally had: auto wlan0 iface wlan0 inet (something - I thought it was loopback but didn't work when I added it).

The instruction told me to put:
auto eth0
iface eth0 inet static

Which I did, using my own ip numbers, except for "broadcast". I didn't add that in because I didn't have a clue what to put there. When it didn't work, I tried putting it back to what I originally had except I can't rememebr that last bit. I added dhcp instead of what I thought it was but this didn't work either.

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Networking :: Can't Change From Dhcp To Static Ip Address

Jan 16, 2010

Can't change from dhcp to static ip address.I've installed Oracle's version of Linux Redhat 5, but I'm having no success changing from dhcp to a static IP address. My machine is plugged directly into a Belkin router which has the IP address: I use the gui: /usr/bin/system-config-network and set the network device to dhcp,it works fine. But if I set the IP address manually, I get no internet traffic, and if I ping an internet website, "network unreachable".The installation instructions for Oracle say that they want a full domainname. I've tried This worked in the last place I did a successful installation.It was the address of my ATT router. If I plunked that into a browser, I got the router configuration.

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Networking :: Change Static Gateway Ip Address?

Mar 31, 2010

when I do "route -n", I got:


Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface U 0 0 0 eth0 U 0 0 0 eth0 U 0 0 0 lo UG 0 0 0 eth0

I need to change the static configuration, like I, I don't know how it got there also I want to delete from a static gateway. How can I do this?

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