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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• VMWare Hypervisor vSphere 5 - VM static ip from VLAN NAT

  - by Ian Livingstone

  I have a VMWare vSphere 5 Hypervisor server that has a static ip address assigned to it by VLAN that is configured to perform NAT. The static IP is assigned to the bare metal server via the NIC's mac address. I want to setup a guest machine to also have a static ip address, how can I go about having this setup? I have assigned a IP for the guest's MAC Address but it doesn't seem to be working as when I ping the ip address it does not respond. The guest is running ubuntu 10.04 server edition. I am trying to assign it a static public ip address. Any help would be greatly appreciated.

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Why can't European users access my site?

  - by japancheese

  Hello, My site has been running just fine for the past couple of years, but all of a sudden, two days ago, European users have been experiencing serious connection problems to the site. I really want to fix this for them, but what's the best way to figure out what the issue is? I have absolutely no connection problems to the site on my end, nor do Asian or other American users it seems. Using just-ping.com, some European servers come back with some packet losses. I tried doing some traceroutes from European servers to my own, but they all seemed to work just fine. I'd at least like to be able to tell users that if the problem does not lie with my server, then it at least lies somewhere out of my control. I really want to figure out what the choke point is though. Is there another way I might be able to find out why they can't seem to connect to the site? Just looking for any other ideas from people that have had a similar experience.

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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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• Why would http & https be blocked, even in safe mode with firewall disabled?

  - by Cogwheel

  I have a windows 7 machine (dell studio xps). Everything on it seems to be in working order. The network device says it has internet connectivity, and indeed I can ping websites, transfer files via ftp, connect to vpns and remote desktop, but the web won't work. I've disabled the windows firewall and still no go. There are no other firewalls installed. The computer came with a trial of norton 360 so I also used the norton removal tool (which solved a similar problem on another computer for me previously). Any thoughts?

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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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• Is there anything that can be done to make X forwarding over LAN less painful?

  - by Earlz

  I have two *nix machines that I like to remotely do graphical things sometimes with. One of those machines is my Arch Linux media server, and another is my OpenBSD router/general server. My current task was installing a Windows XP over virtual box on my media server. I preferred to do the installation from my main workstation so that I could continue to watch TV from my media server on it's "actual" display. I soon noticed that X forwarding is quite painful though, even over low-latency LAN connections. Are there any settings I can tweak to make it a bit less painfully slow, jittery, and laggy? My LAN is rather small, 100Mbit, and ping times to the other box average at about 0.15ms. Also, I know Virtualbox has a VNC mode it can use instead of doing X forwarding, but this particular task was just an example

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• Windows VPN not authenticating from ADSL to Wireless link

  - by deanvz

  I have a normal windows VPN on a computer connecting to a 196.201.x.x/24 IP. If this VPN tries to connect from any address in the 41.x.x.x range it cant get there. The server is a normal windows 2008 server, running exchange with a PPPoE IP natted to a public IP on the public gateway of the wireless network as the server is on site and its connectivity is derived from Mikrotik RB's. The computer on the 41 range can traceroute and ping the server, but the VPN does not authenticate. When on the network or any other, the VPN works fine. Is there something that could be configured on the VPN client? All firewall settings of a standard ADSL router have been checked and found to block only ICMP's. Is this a VPN configuration problem or a network issue?

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