Networking :: Unable To Ping/ssh/connect Channel Bonding From Different VLAN?

Feb 26, 2011

I just setup a new LAMP server (CentOS 5.5 x86_64) box with channel bonding on NetXtreme II BCM5709 Gigabit Ethernet (IBM x3650 M3). The problem is I wasn't able to connect to this server when I'm in different VLAN's. This server also unable to ping different VLAN's. But everything works fine when I transact in the same VLAN.Here's the config:

Datacenter VLAN = 9
Firewall = Disabled
SELinux = Disabled


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Networking :: Underwhelming The Routing/VLAN/bonding Performance?

Mar 10, 2011

Upgraded a school network from FastEthernet to GigabitEthernet. Broke the network up into VLANs. Discovered that the router (Cisco 2821) could only route between the VLANs at around 400Mb/s. Tested out some layer three switches. They work very nicely, but are more than we need. So I started putting some spare equipment we had together as a Linux router.

Result: Underwhelmed. The machine has two Intel GigE interfaces. With the machine configured to route between two test VLANs I get about 855Mb/s with a single interface (all VLANs trunked over the single interface). That's about what I'd expect. Maybe a little low. With the two interfaces bonded, I get about the same.

For testing, I set up eight Windows machines, four on each VLAN. The Linux router is the only machine that can route between the two VLANs. I used Iperf to generate traffic and measure throughput between pairs of machines. Two machines on the same VLAN get about 300Mb/s between themselves. With the four machines organized into cross-VLAN pairs, I get about 855Mb/s total throughput on a single interface and very slightly more with two interfaces bonded.

The Linux router has an Intel Xeon E5506 CPU running at 2.13GHz and these are Intel GigE interfaces (built-in). I would expect to get a large boost by adding the second interface. I've confirmed that bonding is working (by pulling either of the cables and watching everything continue to function).

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Networking :: Vlan Tagging With Bonding Not Reaching Gateway

Jan 28, 2011

I am running RHEL 5.3 on a blade server w/ 2 NICs that are bonded. I have 2 VLANs that I am trying to configure. I have created the network-scripts ifcfg-bond0.<vlan#>. I can ping the device but the gateway won't ping. I am in console mode so cutting and pasting output doesn't work.

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Networking :: Channel Bonding Or Aggregation On Latest Fedora Release 14?

Nov 11, 2010

On my previous release *cough* if inenslave was needed, bonding instructions didn't work through aggregation did.

cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto bond0
iface bond0 inet static
post-up ifenslave bond0 eth0 eth1
pre-down ifenslave -d bond0 eth0 eth1

#auto wlan0
#iface wlan0 inet dhcp
#wpa-conf /etc/wpa_supplicant.conf

For some reason the unmentioned former disto, I could not get wireless networking under this configuration and a simple wlan0 interface, in case either cable were to sever it would retain a wireless. The bonding was done for speed, and I believe I can't get faster than mode=4.

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Networking :: Bonding Mode 1 Fails - Can't Ping The LAN

Oct 8, 2010

I'm trying to set-up a back-up (mode 1) bonding nic. I can't ping the LAN, pinging bond0 locally however works. Here is my config:

alias eth0 e1000e
alias eth1 e1000e
alias eth2 e1000e
alias eth3 e1000e
alias scsi_hostadapter ahci
alias scsi_hostadapter1 usb-storage
alias bond0 bonding

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Networking :: New ISP / Modem... Unable To Connect To Ssh Server (or Ping) Remotely?

Jun 4, 2010

Tried turning firewall off, i tried port forwarding tcp port 22, but it still doesn't work. Also am unable to ping modem over WAN, i can ping the modem locally though. Tech support claims pinging and ssh is not part of the internet so they wont support it in any way.

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Server :: Channel Bonding On NICs From 2 Different Machines With RHEL5.5?

Aug 3, 2010

I am currently investigating channel bonding for rhel5.5.Is there any way I can create one bond from nics on two different linux machines.They will be a cluster without any clustering software like beowulf or LVS.There will be a cluster interconnect through which they can communicate.Should I tweak the bonding module??

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Networking :: Route Non-vlan Packet To A Vlan Interface

Apr 20, 2010

do you know if there is any possibility to route/force non-vlan packet to a vlan interface in Linux?

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General :: Bonding - Cant Ping The Gateway Or Any Other Server

Jun 14, 2011

I have configured bonding on 64 bit centos 5.4 I have to put the machine to a different VLAN for that i did the Ip change and restated the network. but i cant ping the gateway or any other server in that network. the cofig files are as follows

vi /etc/modprobe.conf
alias eth0 bnx2
alias eth1 bnx2
alias scsi_hostadapter aacraid
alias scsi_hostadapter1 ata_piix
alias usb-controller ehci-hcd
alias usb-controller1 uhci-hcd
alias bond0 bonding
options bonding mode=1 miimon=100

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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 Networking :: Laptop Will Not Connect To APs Using Channel 13?

Sep 22, 2010

I'm relatively new to Ubuntu, and have just installed 10.04 on a toshiba portege M100 laptop. Having got over the intel video chipset problems I tried to connect to my WLAN. Network manager would not connect. I tried switching to WPA, WEP and no encryption. No effect I still could not connect. I also noticed that network manager can find other APs much more quickly than mine.Haveing done some searching I tried removing network manager and installed wicd. Was good at finding the AP but reported it as operatingon channel 0. Still would not connect. I tried changing the AP channel to 6, suddenly everyting worked. I switched back to network manager (wicd got in a tangle over hidden networks). Still works.

Having scoured the web for help I found reference to 10.04 kernel suporting US channels. and that I should create a file /etc/modprobe.d/cfg80211, containing "options cfg80211 ieee80211_regdom=EU". I have tried this and it doesnt have any effect. I have noted that there are numerous variants of this advised by different people.Whilst at home I can operate my AP n a US channel, when I am on the move I cannot. I would like to get this working if at all possible.For info the wireless adaptor reported is:

description: Wireless interface
product: PRO/Wireless 2200BG [Calexico2] Network Connection


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Debian :: Unable To Connect Or Ping Server In DMZ?

Apr 8, 2011

I'm trying to run Debian server in our network. We have SSG5 Juniper Firewall set up to route traffic from our trusted network to our DMZ can connect / ping all Windows servers which are in DMZ. When I try to connect my Debian server instead of one of the server's static IP I'm unable to connect or ping to it. The server itself is able to connect to internet resolve DNS if I allow connection to our trusted network I'm able to ping or connect to any computer in trusted network but still unable to ping from trusted to DMZ. The SSG5 policy is set up to allow any connection from trust to DMZ and interface is set up to route all traffic.I have tried to trace the ping It'll go through firewall right to the interface needed but then it'll time out as like the server is not connected at all.

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Ubuntu Servers :: UEC: Unable To Ping And Connect To Instance?

Mar 30, 2010

I have set up UEC on a single machine 64 bit blade. I have followed the steps as per the documentation.I am using Managed NOVlan mode. I have installed the Karmic kola image. When I try to run the instance, I get an error "no resources available. Try --addressing private". When I try addressing private, an ip address is assigned and the instance was running.

a) When trying to ping the ip, error displayed that the host is unreachableb) I am also unable to connect to ubuntu@ using ssh. Error message is displayed that " No route to host".I have searched the forums but couldnt find any solutionPS: I suppose everyone is very busy. I see very limited responses to posts. Sharing your experience and expertise will be helpful for all and will reiterate the meaning of ubuntu

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Ubuntu Networking :: 'wlan0 Is On Channel -1 But The AP Uses Channel 6' With Airplay-ng?

Jun 29, 2011

I'm trying to crack my wep password just for kicks, but I keep running into the same error. When I try to use airplay-ng for the packet injection, it always gives me the error " wlan0 is on channel -1, but the AP uses channel 6". I've tried setting wlan0 to channel 6 manually, but that doesn't help. I spent a while searching for a solution, but it seemed like each page had a different, usually highly complex solution, that still doesn't work. I have the most recent drivers for my wireless card, and it meets all the requirements. So, is there any solution to this that will actually work?

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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 :: Can Connect But Cannot Even Ping Address

Jul 29, 2011

I have installed openvpn on an ubuntu 10.04 server. I run 11.04 on my desktop. It can connect to my VPN server. The problem is, I have ZERO internet access. I cannot even ping an IP address.

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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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Ubuntu Networking :: Firefox & T'bird Won't Connect But Can PING

May 2, 2010

I have an Acer Aspire One that worked fine with version 9.* of Ubuntu, then I upgraded to v10.1. Now Thunderbird, Evolution, and Firefox (Namoroku?) can't connect, either wirelessly or by Ethernet cable, to my ISP. I get error messages like "connection timed out" or "cannot find {link}". I can PING my ISP from Terminal, though, and I have the machine set up for dual boot with Windows 7 and Firefox works fine under Windows.

I have no idea what to look for or where to start. Any help would be greatly appreciated.

Here's the output from sudo lshw -c net

description: Ethernet interface
product: Atheros AR8132 / L1c Gigabit Ethernet Adapter
vendor: Atheros Communications


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CentOS 5 Networking :: Can't Ping / Connect Past Router

Apr 22, 2010

I have a box that I installed Elastix on as I'm trying my hand at Voip and Linux. I'm basically very green when it comes to Linux and the console. As I was following a guide @ to securing the box, it asked me to: wget [URL], But I get: Resolving failed: Temporary failure in name resolution. I searched around and tried configuring resolv.conf to no resolve - :) unintended pun

I changed /etc/sysconfig/network to include GATEWAY= From the internet I have a modem-, a telecom voip box-, and then my router I'm able to ping machines attached to the router but nothing beyond that. I tried to get the results for ifconfig via putty on this machine but it says command not found. I can get it when I log in at the box in question though.

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Networking :: Unable To Ping Win XP Box From RH9 Box?

Oct 15, 2010

I have installed redhat 9 on my pc i want to configure samba i connect these two pc with cross cable i given both c class ip add when i going to ping from linux pc getting ping but xp getting ping

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Networking :: Unable To Ping To Internet?

Mar 24, 2010

My Internet Router is on

I have 2 NICs in my Linux Box: (Firewall OFF)

Eth0 -> and cross-cable connected to Internet Router (
Eth1 -> Connected to switch hub

Default gateway of Eth0 is to Internet Router (

From Linux-Box.. I able to ping to internet(ie. ping

Client PC: (Firewall OFF)
Default Gateway is

I am unable to ping to internet (ie. ping

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Networking :: Getting An Ip Address From The DHCP Router, But Cannout Ping Any Other Ips Or Connect To The Internet?

Jan 31, 2010

I've only been using linux for a few days so I don't know all the tricks. I'm pretty savy configuring windows networks however.My adapter is (according to windows) a: CNet PRO200WL PCI fast ethernet adapterLinux says it is a: 21x4x DEC-tulip compatible 10/100 EthernetI do seem to be getting an ip address from the DHCP router, but I cannout ping any other ips or connect to the internet.I've tried a bunch of different options, switching things back and forth, but it still doesn't work, and honestly i don't even know what some of the options mean.

ALSO, if this helps:
paladin:~ # ifconfig eth0
Eth0 Link encap:Ethernet HWaddr 00:08:A1:03:3C:99


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Fedora Networking :: Unable To Ping Router

Jun 9, 2010

i have Fedora 13 dual booting with Win XP and i cannot ping my router in Fedora. just reinstalled and i'm still unable to ping my router.everything looks like it was installed correctly except in the ifcfg-eth0 it has IPV4_FAILURE_FATAL=yes dont think this should have a value of yes.

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Ubuntu Networking :: Unable To Ping To Windows?

Jan 8, 2010

I have am having some network troubles. I can't access my samba share. Trying to resolve this I realized I couldn't ping from ubuntu to windows. (default ubuntu.jaunty.server.x64)

Windows IP..
Ubuntu IP...
Laptop IP...
Router IP...


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Ubuntu Networking :: Unable To Ping On Network

Jan 11, 2011

I have ubuntu 10.4 running on both my desktop and laptop. Both machines are connected to the router in wireless mode with Wifi.I can access internet from both machines without any issues, however I cant ping one machine from another. (and vice versa)

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Networking :: Unable To Ping Between Centos And Windows XP

Dec 16, 2010

In my office i have a network of and a squid proxy server running, all other systems have windows XP and one system has centos. On centos system i have three lan cards and i want to test some things on it. So i assigned another IP on it of range and same range on another windows system. And all the systems connected through a same network switch.

Unable to ping between Centos and Windows system. If i ping from one centos to windows system with the series of then it replies very well but same thing is not happening in other IP series.

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Networking :: Unable To Ping Virtual Ethernet

Mar 24, 2010

My Eth0 has 3 virtual Ethernet (eth0:1, eth0:2, eth0:3)

Eth0 ->
Eth0:1 ->
Eth0:2 ->
Eth0:3 ->

I am unable to ping them ( - from Client's PC.

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Networking :: Ubuntu Server Cant Ping Or Connect External / Can Resolve Hostname And Domain

Oct 15, 2009

As the title suggest, I have downlaoded the latest copy of Ubuntu Server from the ubuntu website.Everything installed fine. DHCP configured ok as far as I can tell. I can ping other machines on my network (which are running Windows) and they can ping the Ubuntu machine and conenct to Apache which is running on it.If I try to ping or any other domain, it gives the correct IP address but gives no response to any pings, dont telnet on port 80 (or any toher potr for that matter) on any machine on the internet. I checked the settings using ifconfig to see what DHCP had assigned, and they matched the windows machines configuration (other than the IP address obvisouly). I tried assigning a static IP, even reserving a particular IP for my NIC.

Whatever I do, i cant connect to any machine outside the network via IP or domain.I have searched everywhere and tried everything i can find on the net but still to no avail.The Windows machines are part of a domain called alcom-uk.local and run off of a Windows Small Business 2003 Server. Not sure if i need to manually setup Ubuntu to connect using a domain or anything.

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Fedora Networking :: Configure Router - Unable To Ping Between Two Pc's

Dec 15, 2010

I have a router which have 4 ethernet ports(eth0,eth1,eth2,eth3,eth4 ) & One ADSL Line & One USB, I need to configure My router eth3 as a WAN & eth0 as a LAN using iperf, I am going to findout test a my Application(using iptables) whether my application is correct or wrong As of now I configured like server pc1(>eth0(gw)( -->pc2( For eth3 as a WAN and eth0 as a LAN. But I am not able to ping between two pc's.

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Ubuntu Networking :: Unable To Ping Windows 7 Box By Hostname?

Feb 11, 2011

I have a windows 7 desktop hardwired to my wireless router and a windows xp laptop connecting wirelessly on the same network. I am able to ping the windows 7 box by its ip address but unable to do so by its hostname. This is very inconvenient since I would like to set up a share by hostname (doesnt change) and not by ip (changes occasionally since its dhcp).

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