Fedora Networking :: Ping Working But Internet Not Working From Dhcp Clients
Jul 17, 2009
I have a strange problem for internet. My clients (winxp - S2) can't get internet.Let me explain my scenerios. Fedora 10 with lan (eth0) having direct internet from dsl model, client (XP service pack 2) can use samba shares using dhcp (wlan0) installed in Fedora 10 box. client can ping my linux box.Now problem is: client (dosbox) can ping the google ip address (i.e ping 74.125.39.106) but can't use 'ping www.google.com'. That means ping with ip works for internet from my client. My linux box can. I can use internet from FC10 but can't use iexplorer from my client to have internet. I have enable ipmasquarding in Firewall and dhcpd is running on wlan0 for dynamic ip address of my clients.Can someone suggest me what kind of problem having I? What should i do to success iexplorer for internet? what possibly am i missing?
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Jan 1, 2010
I can ping my router, i can ping google and i can ping the ip address you get in the ubuntu help.If i type 192.168.1.1 i can get my router control panel/i just cant connect to the web,
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Sep 10, 2009
My server was working perfectly.
My other uses on on LAN can access Internet but Cant ping the server.
Though they were able to do that earlier.
No software installed. No change in any files.
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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
[code]....
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Jul 17, 2009
I'm having a bizarre problem where my network connection stops working randomly. At first I thought it was a DNS issue since Firefox simply chilled out on "Looking up [hostname]" until it timed out, but after further investigation (pinging IP's, "host" and "dig" being unable to reach servers) it became apparent that I couldn't even access the DNS servers i.e. the Wicked Connection of the East was most sincerely dead.
There are two strange things about this: one, there are no errors except "timeout". The network manager is happy, Firefox is happy until the lookup fails... Two, the failures only start *after* DHCP configuration. DHCP configuration never has any trouble sending or receiving packets. I'm going to try static IP and whatnot to see if that helps, more information later.
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Oct 22, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Jul 1, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.
When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Apr 20, 2010
alright so i set up dhcp server and my clients are getting ip's, can ping each other, and can ping/ssh the server. but nowhere beyond that.
however if i ping an externel site, i get its IP addr, but no pings (100% loss)
im ripping my hair out over this. i know that iptables is right, but i dont know about dns
idk if this helps:
Code:
pavel@ubuntu-server:~$ cat /etc/network/interfaces
auto lo br0 eth0 eth1
iface lo inet loopback
#mapping hotplug
[Code].....
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Jun 21, 2010
I must be very thick as i cannot seem to get my dhcp clients to connect to the Internet properly.
on my lucid server i installed dhcp3 server and bind9, i can ping and dig all on the local network. on the clients however, as soon as i go out of the local network there's messages like "unknown host www.google.com" or "network is unreachable".
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Jun 21, 2010
I have been looking around the forums searching for similar problems, it seems not only me had this problem. About a month ago I did a regular update via Upd Manager. The next day - no wired connection.Still managable, since the local library has wireless. Now that won't work either.Just after I upgraded from Jaunty, I accidentally removed NetwMngr from the top right corner of the screen, but that should not have anything to do with how the program works, right? I now cannot reach NM, if I run it from the terminal, nothing happens visibly.
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Nov 17, 2010
I have a Dell Latitude D530 Laptop (500 GB HDD). Installed Windows XP and then Ubuntu 10.10 to do dual boot. everything works fine in Windows XP.In Ubuntu 10.10 I had issues connecting to Internet(Through Wirelss), I was able to rectify this issue by dsiable ipv6 from firefox about:config and setting true to network.dns.disableIPv6. After this I was able to connect to internet and browse websites from Firefox.But I am having Issues with Evolution Mail(Connection Timed Out) and Google Talk Client(Connection Timed Out).Empathy Internet Messaging gets connected fine.I was wondering if I will have to disable IPv6 System wide and hence I added the following lines to /etc/sysctl.conf
#disable ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
[code]....
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Dec 10, 2010
Were seeing very strange problems related to Alteon and linux clients. We got an Alteon Application Switch 2208(Version 22.0.2) balancing traffic for http, https and ldap. Everything works fine when using windows(iexplorer) or RHEL 5.3 clients, as wget, firefox, or direct telnel to por 80 or 389. But we got some linux machines, a CENTOS 5.5 for example, that can�t make it to work. No special configuration, no different vlans or subnets. It just stay waiting for the response:
[Code]...
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Feb 8, 2010
I have setup a dhcp server on eth0, & i have static Internet connection on eth1.
now clients are getting ip automatically, they are able to trace root upto eth0 & eth1.
but i am not able to access Internet from client machines. i am using open suse11 as a server.
i am not able to do telnet & ftp also from client. i am able to access Internet from server.
so please help me to configure my server so that i can access Internet from client machines also.
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Jan 14, 2010
I'm trying to utilize my company's IT orginazation's LDAP service (running on some sort of windows) for authenticating users on an Ubuntu box.Another group has done something similar for CENTOS; I've used their ldap.conf as a reference as well as ap-server.html (LDAP Authentication section)I can't get it to work. When I try to connect as my corporate user I see this in auth.log:
Code:
Jan 14 14:32:24 Algalon sshd[7062]: nss_ldap: could not connect to any LDAP server as cn=ldapquery2,cn=Users,dc=<companyname>,dc=com - Can't contact LDAP server
[code]...
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Jul 19, 2009
I've been running Fedora 11 x86_64 without any Internet issues. All of a sudden, yesterday, Firefox nor gwibber, nor Xchat can connect? I'm running Chromium and it works and so does pidgeon. I don't know what happened. I did a command-line ping and I was able to get ip addresses, so I'm confused with what changed. I did an yum update Saturday:
Code:
Jul 18 19:03:34 Updated: libcurl-7.19.4-9.fc11.x86_64
Jul 18 19:03:35 Updated: DeviceKit-power-009-1.fc11.x86_64
Jul 18 19:03:36 Updated: openjpeg-libs-1.3-5.fc11.x86_64
Jul 18 19:03:41 Updated: poppler-0.10.7-2.fc11.x86_64
[Code]....
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Aug 11, 2009
I have been a happy Fedora user since late in the F9 release and now use F11 32 bit.Two days ago my 2wire modem/router took a dive. My ISP sent us a Motorola 3347-02 and since then my computer will not reach the internet. I have read everything I can and still haven't found the solution! Some things that I have tried: Disable network manager and do it manual, configure static IP, wipe system and reload, installed F11 on another computer.None of these have worked.Now I am booting from Ubuntu and have no issue but I can't stand Ubuntu.
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Dec 15, 2009
I have installed Fedora 12 on my computer. Earlier I had tried Arch Linux & Linux Mint 7 on the same but on all the three OS's I was unable to get net working. I connect to the net via DSL modem(MTNL BB) & connect it to the PC via ethernet port. Though Fedora 12 shows that the network is connected but I'm unable to browse or chat.
Here is a screensnap of network information;
Pinging google.com returns with an unknown host error while pinging 192.168.1.1 yeilds no results. The cursor gives busy status & upon manually cancelling the ping, I get 100% packet loss. I connect the same modem via USB to my laptop but the internet works fine there.
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Feb 25, 2010
I have Fedora 12 and Windows 7 in a dual boot configuration in my lenovo laptop.The config of my laptop is core2duo 1.73, 3gb ram and 160gb hdd.I updated my fedora 12 yesterday. But after that internet stopped working. But I'm able to ping google.com successfully.Internet is working properly in my windows. I have posted this message from the same ethernet connection in my windows.I have posted the output when pinging google.com down here. code...
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Nov 6, 2010
I installed wireless usb adapter and it configured automatically and it show all the wireless network ,but if I want to open internet by Mozilla Firefox it not open ,how can I setup my internet connection?
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Feb 28, 2010
I am working behind a http proxy (172.30.x.x:3128). I have configured it in my terminal. All the applications such as wget,lynx firefox etc. are working correctly.However all dns utilities like nslookup, host and even ping too are not working.Following is output of host command:
Code:
root@ding:~# host google.com
;; connection timed out; no servers could be reached
Output of host -T:
[Code]....
To connect to net I have to first run dhclient3(learnt from this forum!).It gives me my ip but where is dns address sent I don't have and idea.
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Mar 13, 2009
it was not working and ping is not reply me and I add ifconfig lo 127.0.0.1 it is working and getting ping but when reboot it is lost setting how can I set it for always ping working.
PING localhost (127.0.0.1) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ifconfig lo 127.0.0.1 later
[Code]....
now working but IWant reboot later working about same. how can I setting it boot start this .
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May 30, 2010
Long term Fedora user, I have recently decided to set up a small shuttle computer as a media centre (using mythTV), data store/NAS (so all my data is centralized), mini web server, etc. After installing I had the fun of trying to get my audio working correctly (which I did eventually .. after finding out I unplugged the audio after the second reboot and solved it after somewhere). After this, I got internet video searching working through mythTV using adobe Flash. I then went to bed only to find the internet not working (can't telnet, can't traceroute, can't anything). This is both as the mythtv user I have set up and as root.
The setup I have is:
PC -> router -> interweb
192.168.1.7 -> 192.168.1.1 -> interweb
I also have a laptop (F12) which is on 192.168.1.5.
The laptop has access to the internet just fine (no problem at router / interweb).
I have the only access to the router and disabled any ISP access (no changes in router).
I have the only access to the PC (no changes in PC).
I have set SElinux to permissive (no selinux issues).
I have temporarily disabled iptables on the PC (not firewall issue).
So, I decided to look at the differences between my two machines on the network. Initially the PC was missing the route:
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
I changed the services on startup so thet 'NetworkManager' was off, but 'network' started (exactly like my laptop). I turned off avahi-daemon, and any other network sort of daemon which doesn't match my laptop (which I have also customized).
I then set my eth0 config file to this:
Code:
# nVidia Corporation MCP77 Ethernet
DEVICE=eth0
HWADDR=00:30:1B:47:C4:FF
ONBOOT=yes
BOOTPROTO=none
TYPE=Ethernet
DNS1=192.168.1.1
USERCTL=yes
IPV6INIT=no
# DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
# NAME="System eth0"
# UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
IPADDR=192.168.1.7
NETMASK=255.255.255.0
NM_CONTROLLED=yes
GATEWAY=192.168.1.1
MTU=1432
# PREFIX=24
Commented out any lines which I didn't recognize. So, right now netstat -rn returns:
Code:
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
/etc/sysconfig/network:
Code:
NETWORKING=yes
HOSTNAME=sophie
And to me everything looks OK.
I even have inter-communication working fine (I can SSH between the two servers no problems - 192.168.1.7 <-> 192.168.1.5). I can do DNS queries from both just fine (nslookup google.com returns fine). I just can't get any information back from the net. Would it be work me doing a tcpdump or wireshark dump etc ('tcpdump > file' would be easier for me)?
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Jul 12, 2010
I installed dhcp on my Debian server and it was working fine.
untile I restart network with this :
And then dhcp was not working.
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Jun 14, 2010
I have static route for eth1:
[Code].....
eth1 (13.3.3.2) is connected to router port 2/0 (13.3.3.1). I am trying to ping from eth1 to router or vice versa. None of them is not working. Don't know what is problem. [root@perseus anvltest]# ping 13.3.3.1 PING 13.3.3.1 (13.3.3.1) 56(84) bytes of data.
3 packets transmitted, 0 received, 100% packet loss, time 2000ms
[Code]....
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Jun 15, 2011
I am trying to get an arp packet from my wireless wifi router (access point), to which I am not connected. I simply tried ping 192.168.0.1, but the answer was connect: network is unreachable. What can I do about that?
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Dec 7, 2009
I was trying out the fedora live cd but I couldn't get my Internet to work. When I open firefox it always said server not kind no matter what I searched or put into the address bar:
I tried many different things but none o them worked
I am able to ping m router an I'm able to login to my routers page
I am also able to login to my modems page and it says connected to the Internet
I tried restarting the modem and the router but I still got the same problem
I also tried disabling the firewall but still had the same problem
I tried a command and I was able to receive packets from google.com, but It never went through in firefox
I also tried out a torrent (I had it saved on a USB) and it worked it was downloading fine
I am able to ping googles web page but I am not able to search anything.
In firefox preferences and in network proxy I tried many different proxy settings bit none o them worked I always get the message server not found. All this was done while connected directly with Ethernet cable modem and router but untried wireless and it didn't work either on the top right corner of the screen the network icon says auto eth0 active. I'm using fedora 12 livecd.
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Jun 26, 2010
I just installed Fedora 13 on my old compaq presario with a DLINK DWL-122 usb adapter. Both lights are on as if it were working, but network manager isn't auto connecting.
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Jul 8, 2011
I just upgraded from Fedora 14 to 15 and am having problems getting my wireless internet to work. I never had it working in Fedora 14 as it told me "firmware was missing." I have tried many different approaches described online and non have seemed to help me. I have an HP dv6700 laptop with a Broadcom "Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)" chipset. I have installed the Broadcom-wl set from yum as well.
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Jul 22, 2010
Ubuntu and after installing it i can't browse any internet through firefox although ping is working good and downloading plugins to system to run MP3 or videos is also working fine but can't open any website through firefox and i tried the live cd of Ubuntu 10.4 at other PC and internet was working fine and firefox was working fine
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Aug 1, 2011
After a fresh install of Ubuntu 11.04 (from 10.04) and spending several hours trying to figure out why the ad-hoc connection between my two computers (Fedora14 <-> Ubuntu 11.04) no longer worked - it had worked fine for almost 2 years with 10.04 - I've finally concluded it was a DHCP problem. This realisation (which was slow in coming!) dawned on me when I reversed my setup and configured the Fedora box as the DHCP server and everything was suddenly working perfectly! A quick internet search threw up an installation file called "isc-dhcp-server" which other Ubuntu 11.04 - related forums are also complaining about. My problem is that this file, although available in the repository, is not even installed!!!
It seems unlikely that the developers forgot to include DHCP support, so I hope someone can point me in the right direction.
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