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• IP addresses not updating, but showing correctly in the DHCP Address Leases

  - by Bobby

  I first noticed this when I tried a RDP to wxp-38-shop and it connected me to the computer wxp-alvinm As you can see in the picture I pinged wxp-38-shop and it shows a different IP then whats given in the Address Leases page (w2k3 server). I tried to do ipconfig /flushdns on the server as well as the client computer, but it didn't update that way. If I do an ipconfig on wxp-38-shop is also shows 192.168.0.153, so why when I ping it from any other computer why would it be showing the wrong IP?

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• set tap0 using virt-manager for bridged wireless

  - by DaveO

  After 3 days I finally have kvm guests working on the network via wireless (link below - thanks!): My network is 192.168.1.0/24 on the host: sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward" sudo tunctl -t tap0 sudo ip link set tap0 up sudo ip addr add 192.168.1.25/24 dev tap0 sudo route add -host 192.168.1.30 dev tap0 sudo parprouted wlan0 tap0 on the guest: auto eth0 iface eth0 inet static address 192.168.1.30 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.25 and start the guest: sudo kvm /path/to/guest.img -net nic,macaddr=DE:AD:BE:EF:90:26 -net tap,ifname=tap0,script=no This works great and I can ping the local network and the internet back and forth between the guest. But how do I add these settings to the guest's xml config so I can start the guest via virt-manager with the same nic settings? ref: http://www.linuxquestions.org/questions/debian-26/kvm-wireless-bridge-network-691953/

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• Debian Linux server hangs after a week or so

  - by Alex Flo

  I have 2 Debian Linux 6.0.4 servers that have a strange behaviour: after 5-7-10 days they hang. By this I mean the servers need to be restarted and before that ping won't answer. I've been struggling with this problem for a couple of months now and here's some thoughts/what I tried without being able to solve the problem. I changed the RAM on a server. Being 2 different servers I doubt that it could be something related to hardware as a 3rd identical server won't have this problem. I logged the server load and when it crashes the load is fine (quite low) I cannot find anything in the server logs, logs are fine till the server freezes. I don't have access to console unfortunately. While I have years of admin experience I have never encountered such an issue and right now I have no idea where else to investigate. If you have an idea of what I could try in order to fix the problem please share it with me:-)

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• Connected to internet but can't browse after trying to remove Covenant Eyes

  - by Joanna

  I recently got a MacBook Pro. It connects to ethernet\wifi and has internet but when I open Safari or Firefox, nothing happens. I get a timeout for all websites. I had Covenant Eyes on my Mac before and tried to remove it. My friends who work with computers have tried everything (ping, nslookup etc). Network diagnostics show no problems I can see I'm connected through ifconfig because I get an IP. I also get a response pinging www.google.gr. There are no proxies set in my Network preferences. Any ideas?

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• What can cause peaks in pagetables in /proc/meminfo ?

  - by Fuzzy76

  I have a gameserver running Debian Lenny on a VPS host. Even when experiencing a fairly low load, the players start experiencing major lag (ping times rise from 50 ms to 150-500 ms) in bursts of 3 - 10 seconds. I have installed Munin server monitoring, but when looking at the graphs it looks like the server has plenty of CPU, RAM and bandwidth available. The only weird thing I noticed is some peaks in the memory graph attributed to "page_tables" which maps to PageTables in /proc/meminfo but I can't find any good information on what this might mean. Any ideas what might be causing this? If you need any more graps, just let me know. The interrupts/second count is at roughly 400-600 during this period (nearly all from eth0). The drop in committed was caused by me trying to lower the allocated memory for the server from 512MB to 256MB, but that didn't seem to help.

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• belkin wireless router connection drops for ~60sec every ~15 mins

  - by j j

  Hi, I have a belkin wireless-g router, model F5D7230-4. about every 10-15 minutes, for about 1-1.5 mins I won't be able to browse any web sites. during this period, I usually get replys from "ping google.com". maybe 4/5 times I'll get a reply, 1/5 times i don't. I have changed the router DNS entries from "get DNS server from ISP" to 8.8.8.8, google's DNS and that hasn't fixed the situation. This happens on several computers, running windows7, xp, ubuntu, and a mac, so it is definitely NOT an issue with a computer configuration. any ideas?

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• Accessing SQL with the PC name not the IP

  - by Cornelius

  I'm trying to connect to a SQL instance (default instance) on a machine. When using the IP of the machine it connects to the machine. Using the name of the machine on that machine you are able to establish a connection to the SQL instance but using the machine name on another PC the connection cannot be established. And gives the error A network-related or instance-specific error occurred while establishing a connection to SQL Server. ... (Microsoft Server, Error: 10060) The machine that I am trying to establish the connection from can ping the machine with the SQL instance both on the IP and on the name. Why would this be and how can I fix it? Edit: pinging the name does resolve the correct IP. Pinging the FQDN also works correctly.

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• zeroconf (bonjour/avahi): macs do not see linuxes and vice versa

  - by codesnik

  In my home network I have several OS X boxes and several Ubuntu boxes. each Ubuntu box sees other boxes via zeroconf. I can "ssh ubuntu1.local" and "ping ubuntu1.local" from "ubuntu2.local", but both fail to lookup OSX boxes. and other way around, I can "ssh mini1.local" from "mbair.local". but it doesn't see "ubuntu1.local" why? do ubuntu and osx use different flavours of zeroconf? could be ubuntu, or osx tweaked to use common flavour?

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• Check availability of my websites

  - by DeChinees

  Hi, How can I check the availability of websites from hosted by company? Ping the server and checking if the services for IIS or Apache/Tomcat is not enough. I want to see if the sites are responsive, if I can login. My idea is to build a script using cURL to access the websites and parse for certain words. However using cURL to access a secure site (HTTPS://www.fleetagent.be) doesnt seem to work. cURL might not be the best tool! Any ideas how to check the availability of this website? Thanks in advance, Darrell

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• How much the distance and ms can affect on the download speed ?

  - by Prix

  Let's consider A (client) and B (server) where A makes download from B. How much can a bad routing from A to B affect the download speed ? For example A does a tracert to B and get a response of 10 steps where the avg ms is around 300 with 10% packet loss at the 4 step and when the connection is normal the avg from A to B is 10 ~ 30 ms. Could this sort of impact reduce A download speed drasticaly or as long as both side and routes have enough link for the full speed of A from B and vice-versa it should maintain the same speed ? Besides tracert and the ping analyse of A to B what else is used to identify the problem ? If you need extra information please let me know.

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• make sure i've configured dns correctly

  - by user22817

  Hi, On my server with Windows Server 2008, i've added a new zone with my new domain: biografica.ro. I've added a name server for it: ns.biografica.ro and the ip of the server. Also i added two A hosts for ns.biografica.ro and www.biografica.ro. I've also defined first that name server on the site where i bought the domain and pointed it to my ip. Now, i understood that i have to wait 24-48 hours for this new domain to be available online. Question: - is this a way to check on the server that i've succesfully configured it? For instance: nslookup biografica.ro or nslookup www.biografica.ro or ping www.biografica.ro do not work locally, on the server... Can you give me an advice? Thanks.

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• A home router for torrents, gaming, webbing and detailed QoS [closed]

  - by Cawas

  I want to plug in an external HD on it to torrent up never ending (mostly for seeding), with lowest priority. It should even automatically completely stop if it disturbs my net usage, and go back in later. And I want to be able to give gaming (or my computer) the highest priority, because of its ping requirements. It should be above even of Skype and any voip, which also have high priority. Web surfing and "youtubing" comes in the middle - it won't matter much if it delays a second or two. Finally, interface as simple as possible. It's fine if it's command line setup, but it needs to have a GUI. What are my options for routers / firmwares as described? Maybe Gargoyle? Or even Time Capsule? It seems to me good old DD-WRT isn't the best option out there anymore. I wonder what else could cover these grounds.

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• Trouble Connecting to Virtual Machine after IP address Change

  - by David

  I have a VMware image running a copy of Fedora 11 which is hosted on a remote server. The remote server recently had its IP address change. I'm now unable to connect to my virtual machine. The server admin assures me that my virtual machine is running and assigned the new IP address. I have checked the firewalls and had the remote admin restart the VM instance. Neither of these fixed the problem. How do I troubleshoot a remote server which I am unable to SSH to? I'm actually even unable to ping the remote IP (connection timed out).

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• Not able to access other machines on network

  - by TheVillageIdiot

  Hi I'm running Windows 7 Enterprise (32bit) on my laptop. For some time I'm not able to access other machines using \\192.168.xxx.xxx. I've installed VM Ware player on my machine few days back but I don't remember if it happened just after that or there is some other reason behind it. EDIT:- I've disabled VMWare Bridge Protocol but still no effect. Please help me. PS:- I've used both wireless and wired networks. Network sharing is enabled and I can ping other machines but cannot access network shares. I get following message: \\xxx.xxx.xxx.xxx You might not have permission to use this network resource. Contact the administrator of this server to find out if you have acess permissions. The request is not supported. EDIT (2):- Network Discovery, File and Printer Sharing, Folder sharing are all on.

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• How to get rid of NAT in a LAN?

  - by Alberto

  Currently the LAN I manage is organized as follows: internal network (192.168.1.0) which uses a Linux server as a gateway (internal address on interface br0 192.168.1.1, external address on interface br1 10.0.0.2) through NAT; then the 10.0.0.0 network has another gateway (10.0.0.1) which through another NAT connects the whole thing to the internet. What I would like to achieve is to configure the Linux server so that the first layer of NAT is no more necessary, so that for example a computer in the 10.0.0.0 network can ping every computer in the 192.168.1.0 network. I deleted this iptables rule: iptables -t nat -A POSTROUTING -o br1 -j SNAT --to-source 10.0.0.2, but of course now computers on 192.168.1.0 cannot reach the internet; ip forwarding is of course enabled. What's missing here? Thanks

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• DNS is resolving fine but can't access the server (unless changing /etc/hosts)

  - by victor hugo

  Hi all, I have a VPS server with a public IP, I added some A entries in my name server like svn.example.com - 1.1.1.1 Also I added some entries in my workstation /etc/hosts file in order to work with the domains meanwhile the DNSs were refreshed. It's been around 3 days from this and I configures everything in my server (using the hosts file), the DNSs are ready and I removed the entries but for my surprise I can access the servers nor anything in my domain or sub-domains (even a ping doesn't work). I've triple checked and the DNSs are OK. I don't know too much about DNSs . Any help would be appreciated. The IP address of my VPS is 74.63.223.43 I have these domain names, all pointing to the same IP (using A entries) hartoingenio.com www.hartoingenio.com svn.hartoingenio.com

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• Windows Server 2003 - passwordless access to \\myhost\ but not \\myhost.mydomain.net\

  - by Charles Duffy

  I have a Windows Server 2003 system on which passwordless access to local UNC paths is possible using the server's unqualified hostname or its IP address, but not via its FQDN -- even when the hosts file is used to map that FQDN directly to 127.0.0.1. That is: \\127.0.0.1\ - passwordless \\myhost\ - passwordless \\myhost.mydomain.com\ - brings up an authentication dialog Unfortunately, I have a local application trying to resolve UNC paths including the host's FQDN. I've tried resolving myhost.mydomain.com to 127.0.0.1 in both hosts and lmhosts, and calling ping myhost.mydomain.com at the command prompt gives the appearance that this resolution has taken effect; even so, attempting to open \\myhost.mydomain.com\ from Windows Explorer brings up a password prompt, while \\127.0.0.1\ does not. The system is using an OpenDirectory server (Apple's Kerberos+LDAP directory service) for authentication.

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• psloggedon timeout question.

  - by user60707

  Hi guys, I have a list of machine names from my network that I have put in a batchfile to run through the list and show me who is logged onto each. psloggedon \machineA psloggedon \machineB psloggedon \machineC psloggedon \machineD psloggedon \machineE psloggedon \machineF Psloggedon works fine, however when it hits a machine that isnt actually on the network, it hangs for a good 30 - 60 seconds before moving onto the next machine...I was just wondering if there was any way to speed this up so that if it hits a machine that isnt on the network, it moves onto the next machine in the list much quicker. I have read in other places that this could be possible by adding a ping -n loop into the command but im not sure how to get that to work? any ideas guys? Many thanks in advance. Jimmy

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• Apache does not serve non-locally

  - by yodaj007

  I have a freshly installed instance of Fedora Core 16 inside VirtualBox using bridged networking. On it, as root I typed in: yum -y install httpd service httpd start ifconfig Inside the VM, I can open a web browser to 'localhost' and I get the Apache test page. It works. But in Windows (the machine hosting the VM), I point my browser to the IP address returned by ifconfig (192.168.2.122). The connection times out. I can go to a command prompt and ping the VM. Is there a firewall or something that comes with Fedora by default? Or is there something I need to change in a config file?

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• Solaris 11.1 smb share pam.conf

  - by websta

  I would like to enable an SMB share on Solaris 11.1 x64 My steps: pkg install service/filesystem/smb svcadm enable -r smb/server echo "other password required pam_smb_passwd.so.1 nowarn" >> /etc/pam.conf useradd public smbadm enable-user public zfs set share=name=fs1,path=/rpool/fs1,prot=smb rpool/fs1 zfs set sharesmb=on rpool/fs1 passwd -r files public Step 8 failes: It is not possible to enter a password, output is: solaris passwd -r files public Please try again Please try again Permission denied If I uncomment the new line in pam.conf, it is possible to change the password. Nevertheless, it is not possible to access the share from Windows 7. The Solaris machine is reachable with ping. Access with another SMB enabled user is denied too.

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• Mac OS X 10.6.5 and link-local addresses (169.254.x.x)

  - by WMR

  Starting with the latest update of Mac OS X (10.6.5) all Apple applications (Safari, Mail, iChat, etc.) don't connect to the internet anymore, if the assigned IP address is from the 169.254.0.0./16 range. This is not a routing problem, I can still ping any server I want, even connecting via command line tools works. I know this problem could easily be fixed by changing the IP address to a more common RFC1918 address (e.g. 192.168.0.0./16), but this is what the ISP assigns via DHCP and I am not sure I can convince them (Xplornet) to change that. So I am wondering if there's a (hidden?) setting that would convince Apple applications, that they are in fact still online.

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• Why is my hosts file not working?

  - by elliot100

  I've been using the hosts file to for local website development, and it's recently stopped working. No entries other than localhost resolve. I've simplified to test, so it now contains only 127.0.0.1 localhost ::1 localhost 127.0.0.1 test.dev localhost responds to ping, test.dev does not. The file is called hosts with no extension It has no trailing spaces It's saved in C:\WINDOWS\System32\drivers\etc which matches the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DataBasePath Oddly, despite UAC being on, I can edit, delete and save the file without admin permissions No proxy is being used, PC is not connected to network for testing Stopping the DNS Client service seemed to resolve the issue for a few minutes, test.dev briefly resolved but doesn't any more. Only firewall is Windows' Machine has been restarted. Is there anything else I should try?

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• OS X can't resolve localhost suddenly

  - by Conor

  Last week I fired up a website that I'm currently developing locally only to find out that it wasn't working as it was the night before, (or at all). After an inital stage of panic and 'what did I do' moments... I deduced the problem down to the fact that my OS X now wont resolve localhost properly, so connections to my SQL database were failing. I can still ping localhost in the terminal, but in order to get my websites up and running again, I had to change all the localhost entries to 127.0.0.1 This isn't a huge problem as everything is up and running again, but I would like to try to get to the bottom of it. I have a sneaking suspicion that an apple software update caused this issue, as I don't recall doing anything else that would have had any effect. Other than my hosts file (which looks normal), what else could be causing this? Running OSX 10.6.4

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• Cannot authenticate a domain user with SQL Server 2008

  - by Sambo

  I'm new to setting up Domains so I might be missing something simple here... I've installed SQL Server 2008 on a Windows Server 2008 R2 box and I have another WS2008 R2 box acting as the domain controller. I've joined the SQL server to the domain and it seems to be behaving itself fine. I can ping the DC by name and IP address. I created a domain user 'SPSQLAdmin' that I want to use for database access with SharePoint but I can't seem to log on to SQL with this user. SQL complains, saying that the user belongs to an untrusted domain. I've configured the DC to delegate control for any service to the SQL Server but it doesn't improve the situation. What should I try next? Thanks in advance.

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• ARP replies contain wrong MAC address

  - by Jayen

  I've got a robot running linux with wired and wireless adapters. When I boot up, it connects to the wireless fine. When I assign an IP to the wired (either statically or with DHCP), it looks like it works. As in, ifconfig shows a proper IP and route shows proper routes. However, when I do an ARP request of the wired IP, the ARP reply contains the wireless MAC. ??? There's no bridge running on the robot, so why don't I get the wired MAC??? When the wire is disconnected, the wired IP replies to ping... Why is the robot replying over the wireless interface to IP requests on the wired???

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