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• Can not access network computers anymore

  - by Johny Skovdal

  Last Thursday (03/05/12) I got a new computer to be able to work from home. I plugged it, by cable, into the company network and installed most of the software needed for me to do so, by accessing a share on my stationary computer at work. I had no issues here what so ever, and everything just worked. Yesterday evening I tried accessing the company network trough Windows VPN, and while I was able to connect to the network, I was unable to connect to any computers on the network. I did, however, get an error when connecting, but I can't seem to get the error again, to get the details of the error message. Today I am sitting on the company network again, and now I can not access anything on the network like I could last Thursday, though I can ping all the computers I am attempting to access. Here is a list of details that might help in troubleshooting this issue (updated): List of observations / actions My computer is identical to another computer that has no issues. It is not on the domain but rather on the default workgroup, but this was not an issue last Thursday, so I am assuming it still is not. I am able to access my e-mail on the exchange server. I can connect to our TFS server from Visual Studio but not from Explorer. I can also connect to Database Servers and Remote Desktop. I can see several computers when browsing network computers, but I am unable to connect to any of them. When trying to connect to a computer I am consistently met with the error code "0x80070035" (network path not found). I also get the 0x80070035 error when double clicking the target computer from the Network UI. I am not met with a login dialog when trying to access a computer, as I should, since I am not on the domain. (I did login to both Exchange, Remote Desktop and TFS though) Between Thursday where it worked and Sunday evening where it did not, I have installed quite a few security updates, plus various tools etc. that I need for programming. I have tried accessing by computer name and ip and neither of them work. I can ping by computer name. I have deleted all (1 entry) stored network credentials. I am able to access my computer from the target computer. Client and Server can see each other on the network = Network Discovery is enabled. I am using the network profile "Work". When accessing the network through VPN, I am unable to get anything to work using computernames, but all of the above applies when using IP adresses instead of computername. I run Windows 7 Home Premium on my computer. Using powershell attempting to access a share I get the following error (ComputerName and ShareName being correct values of course): PS C:\Users\MyUser> cd \\ComputerName\ShareName Set-Location : Cannot find path '\\ComputerName\ShareName' because it does not exist. At line:1 char:3 + cd <<<< \\ComputerName\ShareName + CategoryInfo : ObjectNotFound: (\\ComputerName\ShareName:String) [Set-Location], ItemNotFoundException + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLocationCommand However, ping'ing the same machine (ping ComputerName) from powershell I get response immediately. (As mentioned in the list of observations/actions, I tried the above with the IP address again on VPN, to get the same result) Conclusion So to sum up, pretty much the only thing I can not do, is access the other computers through browsing (explorer.exe, powershell, map networkdrive, etc.), which means that I am pretty much down to, that it is unable to resolve the path somehow, when trying to connect to other computers trough browsing, though the path gets resolved perfectly using all kinds of other services. Any recommendations as to what I can try next to resolve the issue? :)

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• Ping: Destination Host Unreachable, from the destination host itself

  - by phunehehe

  I have a server that responds in a weird way to ping: $ ping hostname.com PING hostname.com (<IP address>) 56(84) bytes of data. From hostname.com (<IP address>) icmp_seq=1 Destination Host Unreachable From hostname.com (<IP address>) icmp_seq=2 Destination Host Unreachable From hostname.com (<IP address>) icmp_seq=3 Destination Host Unreachable From hostname.com (<IP address>) icmp_seq=4 Destination Host Unreachable I'm confused, as the messages come from the server that I want to ping, and at the same time it's saying Destination Host (itself) Unreachable. Pinging by IP address yields the same result. The server is online and operating normally. What could be the cause?

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• Routing and arp

  - by adolgarev

  If I have >ip ro 192.168.14.0/24 dev eth0 another host can obtain my mac address. But if I flush routing info: >ip ro flush table main arp resolution doesn't work. Broadcast packets "Who has 192.168.14.149" reach eth0 but OS (Linux) doesn't respond despite eth0 has address 192.168.14.149. What connection exists between routing and arp resolution?

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• Google account gives ERR_SSL_BAD_RECORD_MAC_ALERT errors

  - by Kjensen

  A couple of days ago, I started being unable to connect to accounts.google.com, which handles logins to all kinds of google services. I get this error in Chrome: Error 126 (net::ERR_SSL_BAD_RECORD_MAC_ALERT): Unknown error. In IE I get this: I assume it is the same error, just wrapped up. I run Win8 RTM. On the SAME machine, using the same network card, in a VMWare workstation image running Win7, I am able to connect perfectly. On another of my machines on my network, I am also still able to connect with no problem. My girlfriend uses the same network and has also complained a couple of times about this error (google calendar) - but this is anecdotal, since her technical troubleshooting abilities stop at "xxxx is broken". Her machine runs Win7. ;) I have rebooted, cleared cookies, do not run any antivirus/firewall, have not changed network config. The first 3-4 days after installing Win8, I did not have any problems. I have also searched, and found a hint about enabling SSL2.0 in connection settings, which did not help. Anybody know something about this error and what I can do to fix it?

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) exist out there that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly.

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• Why does my DD-WRT not accept SSH connections from my laptop?

  - by Vlad Seghete

  So, here is my system: I have a 2Wire AT&T modem/router which I use for wireless and a Buffalo router flashed with DD-WRT which is physically attached to the 2Wire and set in the DMZ. I set everything up on the DD-WRT to be able to connect to it using ssh and also so that it forwards ssh requests on a different port to one of the servers behind it. Now, when I am physically connected to the DD-WRT all this works great and as I would want it to. I ssh into the two different ports using the WAN IP of my network, and I get where I expect to land. If, however, I am connected using wi-fi to the 2Wire, the same commands do not work. I do not get an error, simply a timeout. I have trouble understanding this, since the DD-WRT is set in the DMZ and everything should pass to it. To further complicate the problem, I tried connecting to the same IP using my phone (wireless disabled, so really from the WAN) and surprise, it works! If I go back on the local network by enabling the wifi, the ssh connection times out. To make this even stranger, my WAN IP address always responds to pings (meaning in all the above situations). What could be going on here? I know what I should do, completely disable the 2wire as a router and use it strictly as a modem and them use all the routing capabilities of the dd-wrt. It's what I will probably end up doing anyway, but my question remains, because I really want to know what is happening here.

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• Trixbox CentOS Default GW Problem (Multi-homed server)

  - by slashp

  I'm having an issue with a CentOS trixbox server which is dual-homed (one private facing NIC [eth1], one internet-facing NIC [eth0]). I can't seem to get the default gateway to set properly to our ISP's GW via eth0. I've modified the /etc/sysconfig/network to contain both a GATEWAY & GATEWAYDEV line and removed the GATEWAY line from /etc/sysconfig/network-scripts/ifcfg-eth1 (as well as /etc/sysconfig/network-scripts/ifcfg-eth0). No default GW shows up in the routing table unless it's specified in the ifcfg-eth1 file (which both the wrong interface and wrong gateway IP), otherwise, the routing table simply does not contain a default gateway..any ideas would be greatly appreciated! Thanks! EDIT Just realized when attempting to add the default gateway manually using the route add command, I receive an error stating: SIOCADDRT: Network is unreachable I know this error can occur when your default gateway and interface IP address are not on the same subnet..in this case, my public IP address of eth0 is a /29.

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• Cannot connect to WEBrick on home network

  - by Chris Stewart

  I'm an Android developer and often my applications require server-side code. I typically use Ruby on Rails for the web app, and during development will run the server on my local machine (Mac OS X) with WEBrick. In the morning when I get to the office, I'll run ifconfig in the console to see what IP my laptop has been given that day. I'll use that IP in my Android app when making requests to the web app in question. This all works fine, when I'm in my office. When I get home, I attempt to do the same thing, find my laptop's IP via ifconfig, set it in my app's config file, but the destination can never be found. To exclude my app from the set of hurdles, I attempt to visit the web server IP (e.g., http://192.168.1.4:3000) from my phone's browser, and it cannot connect. If I try from my laptop, which is running the web server, it works fine. If I try from another machine, on the same network, it also is unable to connect. Given this, I think I've narrowed it down to some kind of configuration in my home network, but I frankly have no idea what the cause could be. I don't have anything special at home, your basic Verizon FiOS router/modem with everything connected via Wi-Fi (Wi-Fi for both phone and laptop at work as well, fyi). I've tried disabling the firewall on my Verizon router, enabling port forwarding, and just about everything else I could do for port 3000, and nothing has changed. Dear Server Fault geniuses, please help a poor developer out. :) Edit: Some follow up items to add. My Mac's firewall is not active, and all incoming requests are allowed. I've also verified on my phone and laptop, that they're on the same network (192.168.1.4 Mac, 192.168.1.9 Phone). I have no idea why this isn't working. Edit 2: I went into System Preferences, enabled Web Sharing, and tried to view the website from my phone and it didn't connect. So it's not WEBrick or related to Rails. The firewall on my machine is off and the firewall on my router is off. Edit 3: Some progress. I set up port forwarding for port 3000 to my laptop, found the external IP, and used that and it connected fine. So, there's definitely something not quite set up correctly on my internal network.

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• Monitor mode 802.11 captures on OSX

  - by Mike A

  I'm trying to determine the difference between capturing 802.11 frames in the following ways on OSX (10.8.5). It's a bit esoteric, but I use "Option 2" to capture frames for later analysis, and am wondering if I'm missing something. Option 1: use "airportd": $sudo /usr/libexec/airportd en0 sniff Option 2: use "airport" followed by tcpdump: sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport --channel= sudo tcpdump -I -P -i en0 -w /tmp/capture.pcap (or alternatvely eliminate the -w and watch packets real-time). From what I can tell: Both commands, according to the wifi icon on OSX, put the interface into 'monitor' mode. Both commands output a pcap file that is readable in both wireshark/tcpdump & Eye PA. Both commands appear to capture management, control and data frames. The rub: Option 1 disconnects you from the network. This is expected, when putting an interface into 'monitor' mode. Option 2 does NOT disconnect you, provided you've set the channel to the same channel your currently connected to. This has a distinct advantage of keeping your connection up while capturing in monitor mode. My question: Option 2 does not seem like it should work, or more specifically, it does not seem like I should be able to remain connected while also capturing frames in monitor mode. On a wired NIC, you can be 'promiscuous' and still send frames, though I didn't think the same was true for wireless NIC. I'm questioning the validity of capturing frames w/ Option 2?

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• Internet access only works after turning off and on the local connection

  - by AgentFire

  Every time I turn on the computer, it has no internet access. The network card is connected to a router which broadcasts the internet all over the office LAN. Once I turn off and then on the local connection (or network card), the internet access works. Rebooting and logging out/in again does not help. Only the turning off and on the network card gives me internet access. Why is that? How do I fix it?

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• My Macbook Pro wifi intermittently won't turn on sometimes after sleep, does anyone know how to solve this?

  - by Simon

  Hello, My current-generation MacBook Pro 15" (10.6.5) intermittently has problems turning the wifi (airport) on. The usual symptom happens when I: Sleep the machine Open from sleep Wifi is off (the airport signal is blank) I click on airport icon-Turn Airport On, but nothing happens. I googled around a bit and found one recommended solution where I delete the "automatic" location and create a new one and enable the wifi, or I delete the "AirPort" from the location and add it back, but neither of these resolve the problem. I also called AppleCare and they had me delete /Library/SystemConfiguration and restart, but that hasn't solved the problem. I have to reboot, which is very painful. Does anyone have any idea of how to solve this?

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• Is there no such thing as a Gigabit switch?

  - by Torben Gundtofte-Bruun

  According to the manufacturer specification, even my rather plain desktop computer has "Gigabit Ethernet". So when I want to copy large files over the LAN (not Internet) it would make sense to have a gigabit switch. I'm searching eBay for a gigabit switch for a planned home network upgrade. The products I find are all labeled "gigabit" but they all have 24 x 10/100Mbit autosensing ports and sometimes 2 x 10/100/1000Mbit autosensing ports. It was my understanding that 10/100 is ancient and that modern computers have network interfaces that work with 1000Mbit, so it would make sense to get a switch that has 24 x 1000Mbit ports. Did I misunderstand, or are sellers (deliberately?) mislabeling older hardware? (Let's not dive into wired vs. wireless networks and how "N" wireless is fast. You'd be right, but not answering the question.)

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• Monitor Bonded Interface for Disconnection

  - by bradlis7

  I am trying to monitor for network failures on a machine, and one portion of that is to monitor interfaces that are intended to be active also be "RUNNING". An Ethernet port, such as eth0, will say "RUNNING" if it is physically connected to another device. The problem lies in the bonded interfaces, such as bond0. If all of the ethernet devices are disconnected, it still says that it is running, and it is still pingable. Is this by design, or is my system setup incorrectly? Does the miimon option have something to do with this?

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• Tunneling a public IP to a remote machine

  - by Jim Paris

  I have a Linux server A with a block of 5 public IP addresses, 8.8.8.122/29. Currently, 8.8.8.122 is assigned to eth0, and 8.8.8.123 is assigned to eth0:1. I have another Linux machine B in a remote location, behind NAT. I would like to set up an tunnel between the two so that B can use the IP address 8.8.8.123 as its primary IP address. OpenVPN is probably the answer, but I can't quite figure out how to set things up (topology subnet or topology p2p might be appropriate. Or should I be using Ethernet bridging?). Security and encryption is not a big concern at this point, so GRE would be fine too -- machine B will be coming from a known IP address and can be authenticated based on that. How can I do this? Can anyone suggest an OpenVPN config, or some other approach, that could work in this situation? Ideally, it would also be able to handle multiple clients (e.g. share all four of spare IPs with other machines), without letting those clients use IPs to which they are not entitled.

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• How can I switch from a custom linux network namespace back to the default one?

  - by Martin

  With ip netns exec you can execute a command in a custom network namespace - but is there also a way to execute a command in the default namespace? For example, after executing these two commands: sudo ip netns add test_ns sudo ip netns exec test_ns bash How can the newly created bash execute programs in the default network namespace? There is no ip netns exec default or anything similar as far as I've found. My scenario is: I want to run a SSH server in a separate network namespace (to keep the rest of the system unaware of the network connection, as the system is used for network testing), but want to be able to execute programs in the default network namespace via the SSH connection. What I've found out so far: Created network namespaces are listed as files under /var/run/netns (but there is no file for the default namespace) The ip netns exec code can be found here: http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/tree/ip/ipnetns.c#n132 - I haven't grasped everything that it is doing yet, but it doesn't look very promising. ip netns identify $$ as suggested by Howto query and change network namespace on linux? returns nothing when in the default network namespace

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• /etc/hosts.deny ignored in Ubuntu 14.04

  - by Matt

  I have Apache2 running on Ubuntu 14.04LTS. To begin securing network access to the machine, I want to start by blocking everything, then make specific allow statements for specific subnets to browse to sites hosted in Apache. The Ubuntu Server is installed with no packages selected during install, the only packages added after install are: apt-get update; apt-get install apache2, php5 (with additional php5-modules), openssh-server, mysql-client Following are my /etc/hosts.deny & /etc/hosts.allow settings: /etc/hosts.deny ALL:ALL /etc/hosts.allow has no allow entries at all. I would expect all network protocols to be denied. The symptom is that I can still web browse to sites hosted on the Apache web server even though there is a deny all statement in /etc/hosts.deny The system was rebooted after the deny entry was added. Why would /etc/hosts.deny with ALL:ALL be ignored and allow http browsing to sites hosted on the apache web server?

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• How much packet loss is normal?

  - by Fabian

  I started monitoring our network using SmokePing. Users occasionally complain about bad network connections, but the problems went away after some minutes usually. I now wanted to get some more quantitative information about those problems. SmokePing regularly pings servers inside our network, in a connected network and outside hosts. I only have a limited amount of control over our internal network and none at all for the connection to the outside and to the second network. I now see quite often (2-4 times a day) that packets to the second network and the outside are dropped. Most of the times it is 1-2 packets out of 20, sometimes more. Inside our internal network no packets are dropped. Is this an expected amount of packet loss, or does it indicate that something is wrong? I'm mainly wondering if I should bother the university IT department about it, or if I should just accept it as it is.

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• why udp client work when wirshark capture?

  - by herzl shemuelian

  I have two machine A,B windows 7 os .I connect them end to end and try run a performance test by using tcpreplay. step 1) I check conectivity between to point by netcat In A i run nc -lvup 5432 when I run on B nc -u 1.2.3.4 5432 I can send data from B to A step 2) when in I run tcpreplay in B tcpreplay -i %0 myudp.pcap in A I don't recevice any data . when I open wireshark in A then my nc can read data why? I check dst mac and dst ip in pcap file they are correct. is importan udp src mac or src ip for udp how that I open udp server ?

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• Streaming music throughout the house on a budget?

  - by greggannicott

  I was wondering whether anyone knew of a way to stream music throughout a house on a budget? I want to avoid spending any money on this (eg. I don't want to buy a d-link style device). It would be ideal if I could use my existing hardware and some open source software. I have three old(ish) PCs knocking around. I'm happy to stick either Windows or Linux on them. They can all be hooked up to speakers. The ideal solution would result in: the same audio being heard from every device (eg. when you hear a beat on one device, you'd hear it at the exact same time on another (so you don't get any echo)) I'd be able to control the source application (eg. the songs lined up) with my iPhone. I realise I'm being cheeky with those two wishes - but you never know your luck. Am I asking for too much, or is there a piece of software/protocol out there with this purpose in mind? I've been searching for sometime now, but haven't had any joy. Thanks in advance.

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• Windows - Force Wi-Fi to N mode

  - by Frederick Marcoux

  I bought a month ago the D-Link DWA-160 Xtreme N Dual Band USB Adapter and I wonder about the speed. I have a 60Mbps but the speed is never above 300Kbps when I browse Internet or download something. Even from Microsoft or Apple (the fastest server I found). Now on Windows 8, we can see the Wi-Fi stats in Task Manager, there they are: Notice the red rectangle. The signal is 3/5 and I'm about 5 meters far from my router. An Apple Time-Capsule. Also, the connection type is 802.11g, I want N. I made this config in my Device Properties: Does anyone figured out to force the 802.11n in Windows? (Windows 8 preferably)

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• Severe latency only on one machine and only when accessing intranet site

  - by Joe M.

  I have one desktop machine that is having consistently high latency only when trying to load a page from an intranet site. Using the Chrome Developer Tools, the site shows a "Waiting" time of 4-5 seconds each page load. Other machines have <50ms, and the problem machine loads regular internet sites with <1s latency, so the problem is only on one machine and only when accessing the intranet site. This is a small business and all the hosts are on 192.168.0.1/24 I would have suspected a connection issue with the problem machine but normal internet sites are not having latency. Then I would have looked at connection issues with the intranet web server but other machines are not having latency to it. What else can I look at to troubleshoot this?

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• How to get wireless working (properly) with Sitecom Wireless USB micro adapter 300N on Windows 7?

  - by Timo

  The question says it all, but more detail follows ;) I've got a new computer that runs Windows 7 64-bits (Home Edition) and I'd like to connect it to my wireless home network (Sitecom wireless gigabit router 300N wl-352 v1 002) with a Sitecom wireless USB micro adaptapter 300 wl-352 V2 001. After installing the router (i.e. connected to the modem and power) and ensuring that wireless is indeed enabled, I've installed the driver of the USB adapter on the new computer described above. After the installation (drivers and utility on CD) completes successfull I rebooted my computer and inserted the USB adapter. After discovering the right network and connecting to it using the network key, a connection is succesfully made. (Using the Sitecom 300N USB Wireless LAN utility). In the LAN utility I can see that the signal strength is approximately 50% and connection quality is approximately 80%. Judging from these numbers I assumed that all was fine and started to use the connection (reading news on nu.nl, a dutch news site), but noticed that the connection was lost several times in a very short time span, but each time the connections was resumed, resulting in the 50/80 percent numbers described above. However, the website was not loaded completely and often a timeout would be reported. When inspecting the drivers through Device Management (Windows' Apparaatbeheer in dutch) there were no errors/warnings; everything seemed to be in order. In an attempt to solve this, I downloaded the latest drivers for the USB adapter, but the problems remained. Finally I tried to connect the computer with a Siemens Gigaset USB Adapter 108. This process was a troublesome since I had to download a driver (from the site above) and tell Windows (7) to use the Windows Vista driver when installing the new hardware, since there is (was) no Windows 7 driver available. This resulted in a usable connection, although not very stable when reconfiguring the router. Which took the form of selecting a different wireless channel on the router, even using the Sitecom utility mentioned above to check if there were other networks communicating on that channel (and thus picking a channel that was not used by other networks). Again no result when changing back to the Sitecom USB adapter. Note that this means (I think) that I could use the internet connection with the Siemens adapter, meaning the problem was not in the router. So: How to get wireless working (properly) with Sitecom Wireless USB micro adapter 300N on Windows 7? PS Sorry, but should be able to post one link, while I had links in place for the USB adapter, router and the siemens adapter in place as well, but I'm not (yet) allowed to post these... (The site says I can post one link, but only when no links are present will it allow me to post the question...)

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• Routing and Remote Access Port Mapping not applied to localhost

  - by Computer Guru

  Hi, I've set up Routing and Remote Access (Windows Server 2003) to forward publicip:80 to a server on the private internal network, and that's working great. Incoming requests from the internet to port 80 are correctly forwarded to our internal web server and everything is fine. However, requests on the server itself are not being forwarded. That is, if I open a console window and type "telnet publicip 80" from the server on publicip, the request is not forwarded to the private server. I understand that in RRAS I've mapped port 80 on the public interface to the private server and that's why it's not working; but I don't know how to configure it so that requests from the local PC are also forwarded to the private server. I'd appreciate any help or feedback on the matter. 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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• How to add a broadcast address to loopback with ifconfig on a OS/X?

  - by chrisapotek

  I am trying to use ifconfig to turn on broadcast on my loopback interface. It currently reads: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 As you can see, no broadcast address! :( :( :( I tried this on OS/X but it did not work and it did not give any error or feedback: ifconfig lo0 broadcast 127.255.255.255 Any guru would know that? I have one server that sends one packet. I have two clients running on the same machine as the server. I need them to pick up the packet WITHOUT having to force the server to send it twice.

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