I had configured Squid in RHEL 5 and facing an issue with pinging. Not able to ping any website,hostname is resolving to ip address but not able to ping
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I just set up my first ever bind9 DNS server running on ubuntu server 10.04. This server is also my gateway/dhcp server.
Here is what is weird: If I do a dig @8.8.8.8 dschuett-lmtl.scs.local from any of my clients it resolves?!?! Dig shows that it got the answer from MY Bind9 DNS server (and NOT Google's of course), but why is it still resolving when I'm telling it to use and external DNS server?
The other weird thing is that the SAME EXACT dig command above does NOT resolve internal host names if I do it from the Bind9 DNS server. - Which is what i would expect SHOULD be happening if done from the client machines...
Here are the dig results:
From any internal client:
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I can ping a host on my LAN successfully, but I cannot ping [URL]... for example. I have disabled the firewall and set http_proxy and can browse the internet with "Use system proxy settings" checked in Firefox. I am unable to update with yum either, but I am not sure if this is a side effect or not. I have run a trace on my ip address as I am browsing the internet and I can see the sites I am visiting on our web appliance. However, if I try to ping or update no requests are hitting the proxy so I don't think that is the issue.
View 6 Replies View RelatedThis is a RHEL 5.4 install. I did a fairly routine install setting up a static IP address of 10.5.96.10, a subnet mask of 255.255.254.0, and a gateway of 10.5.96.1 with the standard DNS setup for this network. These are all standard network setting for this network and otherwise work fine on other systems. The IP, gateway, and subnetmask all appear correctly on all relevant configuration files. This server can not ping any other system on the network and can not ping its default gateway. No other systems can ping this one either. Also this system can not ping "localhost" or its own hostname. The hosts file contains the line:
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I can ping 127.0.0.1 and 10.5.96.10 and it works fine. Also the firewall is disabled. I know I probably can't get a straight forward fix with the information I have on hand right now, I'm more of a Debian guy, so there might be some Red Hat intricacies I'm not familiar with. I think I had a CentOS install some months back that had this issue and I don't remember how I fixed it, or if I even did. I might have just replaced it with Debian. That's unfortunately not an option this time around since it's not my box.
I have a somewhat complicated network setup that I am testing on an internal network. I have the following route setup:
PC Client (192.168.2.100) --> Router (192.168.2.1) --> DSLAM (on our internal network) --> PPPOE Server (192.168.9.1) on Linux Ubuntu 8.04 on interface card eth2.
On the same Linux Ubuntu Machine on interface card eth1 (static IP 192.168.5.100), I have an Asterisk SIP server plugged into it. SIP Server = 192.168.5.101 (static) I need the PC client (192.168.2.100) to register via SIP soft phone to register on the SIP server (192.168.5.101). From the PC client I can ping as far as the eth1 interface (192.168.5.100)...but cannot ping the SIP Server (.101).
From the SIP server (192.156.5.101)...I can ping 192.168.5.100, I can ping 169.254.5.228 (Eth2:avahi), but not sure what that is. I cannot ping the pppoe default gateway (192.168.9.1), which I think you cannot anyway. No firewalls are running. My IPtables I cleaned out totally. I think it might be as simple as a route add, but I really have no clue. Tried building a virtual bridge using brctl LINUX betweeh eth1 and eth2, but that made things worse (could not ping anything after that)
Route table:
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.9.100 * 255.255.255.255 UH 0 0 0 ppp0
192.168.5.0 * 255.255.255.0 U 0 0 0 eth1
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Host - Fedora 12 64bit
KVM
VM - Windows Server 2008 64 bit
bridge-utils
VM can ping host and Internet but host can't ping VM.
I set VM static IP 192.168.0.205.
It turns out dynamic IP - 192.168.0.55
On host:
I have a strange problem with wireless internet connection. We have 3 computers, 2 of them with Win 7 and 1 with Ubuntu 9.10 + Win XP.
Now if all three computers are connected to the internet through wireless router, the computer with Ubuntu 9.10 frequently fails to resolves hosts using various web browsers. I have to disconnect and reconnect to the router to get internet back but it only works for a maximum of 1 minute before it fails again. If the 2 computers with Win 7 logs out from wireless connection then the Ubuntu 9.10 machine works just fine for long periods.
If i boot with Win XP internet works perfect even when the other computers are connected but i really want to use Ubuntu 9.10. The wireless chip is an Atheros 9285.
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 127.0.0.1
I need it to change it in "localhost"
Is that the bind9 maybe?
At work we run DHCP. hostnames have the format: computername.city.mycompany.com
I have a laptop runing Fedora 13 and a desktop I use for backups, etc. My laptop is named copernicus. Desktop is named galileo. If ping either hostname from itself I get back the localhost IP address. If I ping the fully resolved hostname it tells me unknown host. The desktop is exporting an NFS share I use for backing up work data. I need the laptop to be able to resolve host names to mount the share since we use DHCP. The desktop is dual boot and if it is booted into windows my laptop can resolve the hostname properly. What do I need to do in Fedora to get it to register a hostname with the DNS and/or DHCP server? Should the domain and the search path below both say the same thing?
Here is resolv.conf on the laptop (I am at home). The desktop looks the same, except for a different nameserver. Both computers can resolve other hostnames, just not each other.
I have a Windows 7 professional x64 pc that intermittently fails to resolve host aliases. The nameserver is a Fedora 11 system running bind 9.6.2-p2. Its cannonical name is trixter.intranet.org, and it serves several web sites, each with a different host alias: hg.intranet.org, svn.intranet.org, bugzilla.intranet.org, etc.
Occasionally, the Windows pc will be unable to find any of the aliased hosts, even when it can find the canonical name. The aliases will be un-resolvable for a period of several minutes, and then, with no intervention, they can be found again. Trixter can always resolve the aliases to itself.
Even stranger, when I use Cygwin from the problematic Windows 7 PC, it CAN resolve the hosts. I can ping hg.intranet.org from a Cygwin shell, but not from a cmd.exe window. Administrator privileges make no difference.
I'm running openSUSE 11.2 (Linux piura 2.6.31.12-0.2-desktop #1 SMP PREEMPT 2010-03-16 21:25:39 +0100 x86_64 x86_64 x86_64 GNU/Linux) and have a network problem. At work, ethernet works fine. When I plug it into my DSL router at home (which works with other computers), I encounter the following behavior: ping can resolve host names, however, traceroute and Firefox and Thunderbird cannot.
It happens for both wired and wireless connections.
Host - Fedora 12 64bit
KVM
VM - Windows Server 2008 64 bit
bridge-utils
VM can ping host and Internet but host can't ping VM.
I set VM static IP 192.168.0.205.
It turns out dynamic IP - 192.168.0.55
On host:
$ ping -c3 192.168.0.55
fails
i know this is crazy, but im using a [URL] and have loaded a copy of "red hat linux 7" on the computer. i have no idea what kind of hardware config/spec stuff i should have in my immediate vision, and if i did i'm not sure how i would make sense of it all. linux loaded fine. didnt save drivers. eth0 not showing in ifconfig report, but lo is connecting to network, other host cannot ping linux and vice versus
can mount a cdrom, but not a usb flash dont quite understand how the load methods work involving /mnt/cdrom/"usbutils-0.86tar.gz" eth0 problems and gnome rpm stupidity keeps me from upgrading sys from old version to a newer version, cant even find the cmd to show me that info, sorry. have usb files i want to mount, dont know how to loAD THE CDROM FOLES, SO EVEN THAT ISNT WORKING OUT HAVE DISCS WITH howtos just need to stay focused on steps to get desired end result, while trying to learn too much info for what im currently doing between all the f!@#@ing windows i have open.
I made an ip packet using raw sockets and used icmp header of echo request inside that ip packet.I have a wifi lan with 2 host(laptops) connected to it. when I send the packets to any of these host the reply me with echo reply as i see in wireshark. but when i change the source ip and mac to that of another host there is no echo reply packet in the network but only echo request packet is there. Can anybody tell me why is this happening. and am also using Promiscuous mode so non of the packet is discarding.
View 3 Replies View RelatedI have a server that I can ping, and I can connect remotely with ssh to it. But when I try to connect to apache (port 80) I get "no route to host". But I can connect to localhost It's not just my client system that is having this problem but also systems that are on the same subnet There is no firewall running on the server route on the server
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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...
I am using ubuntu 9.10 and I still cannot figure out this thing. I work behind a proxy managed by my university. Now, I cannot ping the other users on my network although they can ping me. Not to mention, I also cannot ping [URL]... It says : ping: unknown host [URL]... But I can ping the proxy server.
View 4 Replies View RelatedIf I try ping a host on my internal lan from my ubuntu notebook the host name never resolves, but if I ping www.domainname.xxx it will resolve because our dhcp server is setup as the dns server too. If I use the connect to server tool and select samba share and specify host by name, it can resolve that and the shares show up... same dns server, same machine, but different interface/program. My real reason behind this is because my synergy+ keeps falling over whenever the synergy servers dhcp lease expires and it gets a new I have to then specify the new address and change configs.
View 3 Replies View RelatedI 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:
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root@ding:~# host google.com
;; connection timed out; no servers could be reached
Output of host -T:
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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.
I am using Fedora 7 in my server. Currently windows server 2003 (Active Directory integrated with DNS) is running. I want to switch my DNS to Linux. In my small organization there are only 20 users using static IP address and the IP are mostly permanent. so should deploy name server or I just populate eateries in /etc/hosts file ?
View 1 Replies View RelatedI've encountered a problem after doing a fresh install with xubuntu 10.10 (2.6.35-23-generic).some sites are blocked like [url]....if I do dig [url]....- I receive the A, CNAME records and the IP address and everything.when ping[url].... - I receive 'unknown host'.when ping <theipaddress> - I receive responses
View 2 Replies View RelatedI have a machine running linux with 3 ethernet interfaces attached.
My Ifconfig:
My route output:
eth0 is attached to a laptop, eth1 is attached to a PC. eth2 is attached to a DSL modem, and the server is successfully acting as my internet gateway. The trouble is, my PC cannot see my laptop and vice versa. E.G. cannot ping, host seems down.
I am trying to turn an old desktop that has slackware 12.2 installed on it into a dhcp server that performs nat on a certain range of the subnet... the server's hostname is nutshell. Once I have it set up, I am testing it with a slackware64-13.1 laptop whose hostname is firebolt. Nutshell has a static ip. Before messing with the DHCP side of things, I thought I would start with getting NAT working. The steps I have taken are as follows:
I modified the /etc/rc.d/rc.inet1.conf script so that the interfaces would be setup on boot. Eth0 has ISP's static ip assigned to it, and I assigned 172.0.0.1 to eth1. I opened the box as wide as possible, so that former firewalls and security settings would not interfere. The contents of /etc/hosts.allow is All:All, and /etc/hosts.deny is an empty file. The firewall is set to allow everything, i.e., iptables -L has "ACCEPT" as default policy on all chains. Next I used iptables to start nat with the command:
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I can ping external ips from firebolt, so the NAT appears to be working properly. I fire up x-windows and surf a little. While I am surfing it freezes. Checking the pings again, suddenly firebolt cannot ping isp's dns anymore. Checking on nutshell, it can no longer ping external ips either. However, after running /etc/rc.d/rc.inet1 restart on nutshell, all is well, and it is pinging out again. I go back to firebolt and resume my surfing.
A brief description of my network:It is a small home network consisting of an Ubuntu 10.04LTS server edition, an Iomega ix2 NAS, a WinXP pro server and several family laptops.This is all routed through a Netgear WNDR3300 home router. All are assigned IP's via DHCP and all but the laptops are static (via DHCP though). The WAN address/DNS is assigned via DHCP from my ISP.The problem:When one of the machines is offline, Ubuntu does not resolve the netbios name correctly. No surprise here. But what is happening is that it is finding some arbitrary machine on another network. Below is what a ping to an offline host reveals:
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ping -c3 hostname
PING hostname (204.232.162.92) 56(84) bytes of data.
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After I applied below iptables rule.. I am unable to ping the host in 172.16.1.0/24 from OpenVPN client
View 1 Replies View RelatedThe internal network is behind nat done by the PC Router.The TP Link is recieving wireless signal from outdoors and it has switching and basic routing capabilities. I'm using the PC router for better routing options.PC Router (or R for short) is a triple-booting machine - Linux, FreeBSD and Windows. It has two lan cards - external (ext_if) - 100Mbps Realtek 8139 and internal (int_if) - 1Gbps integrated Realtek 8169.The problem is that all traffic from R to the network is slow - about 5-20K, while the traffic in the oppoiste direction is all right - about 10MB that is fine for 100Mbps cables, NICs and switches. The problem persist no matter the OS the pc R is running.I've tried some debugging on the situation as follows:
- put another PC at the place of R - everything is fine. That exclude the possibility of damaged cables, RJ-45s, switches and etc.
- connected both of the NICs to the Internet while the internal network is being disconnected and they both work fine (no delays)
- traffic shaping is not running
- there is nothing in firewalls except NATing the internal network (and it is working fine). Actually these firewall rules have been operational for more than months and everything was fine untill a week or two ago.
- changed the internal NIC with another
- connected the internal network directly to the TP and all of the PCs are getting good network performance. Then connected the R machine to the TP as well and there was good performance between the internal network PCs and R.
- R has good performance to the TP. In fact everything has good performance directly to the TP (when not connecting trough R).
- the problem persist only between R and machines from the internal network.
Since I installed FC11 I can't get vpnc to work (I always getno response from target").Also I can't ping any external IP even with the firewall disabled.What I see strange is that I had the same configuration in FC10 and the router configuration seems okay to me:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.64.64.64 * 255.255.255.255 UH 0 0 0 ppp0
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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.
I just installed a dual boot XP/Debian 5.0.4 setup on my Dell 5100 laptop. I now have constant problems with "resolving host" when using Debian. The connection when using a browser or downloading is noticeably slower than when using Windows or my Ubuntu install on my desktop. Also, whenever using the Debian install on my laptop, both it and my desktop, which both connect through the same Linksys router, constantly show "resolving host" (Chrome browser) until it just timeouts. Rebooting the DSL modem sometimes fixes it for a while (although it's still slow even then), but it eventually happens again. Turn off the laptop/switch to the XP OS on it, and the problems disappear on both the laptop and desktop. Is this a known problem for Debian 5.0.4?
View 7 Replies View RelatedAs 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 google.com 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.