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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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• Create a wifi hotspot in a place where an authentication is required

  - by SoftTimur

  I live in a residence where Internet is provided via cable. Once the computer is connected to the cable, launching a browser will trigger an authentication, I have a username and password to enter, then the internet will be connected. With a gateway (e.g. Wireless Cable Voice Gateway Model CBVG834G) and 2 cables, two PCs can connect to the Internet with my account at the same time. Now the question is, I don't like the cable, and would like to create a wifi hotspot. It seems realizable with the same gateway. According to the instruction on page 2-4 of the manual: Enter http://192.168.0.1 in the address field of your Internet browser. Log in to the gateway with either of the default user names, MSO or admin... However, while connecting to the Internet successfully via cable and the gateway (e.g. google works), opening 192.168.0.1 oddly gives me an error on the browser: Does anyone know what happened? Is it due to the authentication required by my residence? Is there any other way to build a hotspot of wifi? PS: My system is MAC OS

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• Linux/hostapd: AP can ping clients, clients can access internet, can't access www@wlan1 with more than 5-6 packets at once

  - by mhambra

  Please edit the title, can't make it sound better. -- OP. Hi all, I have a Wifi USB dongle in a PC, that serves as an AP for laptop. wlan1: 192.168.2.1, netmask 255.255.255.0, routed: route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.2.1 ping 192.168.2.2 (laptop): ping was ok for lot of packets. Now, I try to access 192.168.2.1:80/myindex.html (apache) from laptop, and can see that own 1kb test page. But, trying to access 192.168.2.1:80/my.jpg, I see the following: GET /my.jpg HTTP/1.1 200 OK <jpg header, about a kilobyte> <TCP packet retransmisson> <TCP packet retransmisson> <end of stream> It seems to be a hostapd's problem (networked stuff worked fine with Ad-Hoc), but it may be also forwarding/routing problem too. What to google for? Even more strange, SSH to that host works fine.

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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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• Network backup for Macs and PCs - formatting question

  - by neilfein

  I'm trying to use a LaCie 2TB drive as an AirPort drive, for backup on a home network. We have one mac and two PC laptops. My plan is to create a Mac partition and a Windows partition. However, Disk Utility won't let me set the windows partition to Windows format; there's no option in the menu for it in the partition tab. Am I doing something wrong? Alternatively, is there a way to partition the drive with one partition that all three machines can see? We have a Mac G5 with 10.4 and two laptops with Windows 7. Thanks!

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• Ubuntu 9.04 Cannot Connect to visible open wifi ap (reason 6)

  - by Andrew Bolster

  I'm travelling currently so the last network i connected successfully to was my home wpa-psk network. I hadn't tried anything until i got to my accommodation that is an open network (that I'm on now on the Win7 partition on my laptop). The network (and a similar archetypical 'linksys' open network, aswell as some protected local networks are correctly displayed in network-manager and upon selection, it happily spins around to its hearts content for a while before saying 'no chance boy'. /var/log/syslog spills out the usual combination of wpa_supplicant and kernel messages, the most interesting of are that the kernel deauthentication reason 6 response. 6 apparently means class2FrameFromNonAuthStation...Client attempted to transfer data before it was authenticated. Anyone seen anything like this? I've already tried going closer to the router to no avail. I don't remember seeing this any other time I've connected to a open AP, even if that AP is far away. (Signal strength for this AP is good, kismet says its around -57dBm, well above the threshold of -80dBm, and I've tried all the suggestions from the 'Related Questions'

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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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• How to route traffic through a specific SOCKS proxy on a per-app basis?

  - by GJ.

  I'm running a certain desktop app (actually via AIR if it makes any difference) which doesn't have any built-in proxy configuration settings. I need to get all traffic just from this app directed through a secure SOCKS proxy. This implies I can't use the global network preferences, as these would affect many other apps. Is there any way to force all network communication through a given SOCKS proxy on a per-app basis? It would also be helpful to know if there's a way to perform such routing globally, based on specific IP addresses (as this could allow for some reasonable workaround).

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• Time-Machine backup over SSH tunnel to NFS mount

  - by BTZ

  I've recently started using a new NAS which runs CentOS 6.2. One of the purposes of the NAS would be to serve as a backup target. Whilst I have been using Apple's Time-Machine for a while and I am very satisfied with it, I'd like to continue using it. Backing up directly to an address in my network is no hassle; all works fine. For security reasons I'd like all my traffic to go through an ssh tunnel to the NAS. This way I can avoid needing to get a VPNserver (for personal reasons). As of NFSv4 the NFS deamon is bound to port 2049, which makes it easy for me to direct all traffic through a ssh tunnel. Tunnel: ssh -f admin@ms -L 2000:localhost:2049 -N Mount: mount -t nfs -o nfsvers=4,rw,proto=tcp,sync,intr,hard,timeo=600,retrans=10,wsize=32768,rsize=32768,port=2000 localhost:/mac_backup /Volumes/backup This works fine for Finder/terminal and throughput is almost equal to direct traffic. (CPU of the NAS does ride high when I reach max bandwidth though) Now the problem: With Time-Machine I can't use the NFS mount point mounted on localhost. TM seems to try to connect to it and then give me a "OSStatus error 65". I also tried using NFSv3 (I correctly forwarded all ports) with no luck. Can anyone shed a light on this and/or give a solution?

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• Torrent upload ratio not updated on Synology DS212+

  - by user179271

  I have a Synology DS212+ NAS running DSM 4.2-3211 (current version). I use it for several purposes including torrent download using Download Station and a tracker that needs authentication. My problem is that my download/upload ratio isn't updated, so it constantly falls down. My NAS is behind a router, and I configured the NAT to forward ports 6890 to 6999 to the internal IP address of the NAS. Here are the Download Station settings : TCP port : 6990, Sharing ratio : 900%, Sharing time : infinite, max download speed : 0 (no limit), max upload speed : 0 (no limit), BT protocol encryption : checked, max numbers of peers allowed by torrent file : 4000, DHT : checked, with port 6889. When the DHT option is not checked, the NAS doesn't upload any files. I don't know what is this option for. Can someone help me to solve this problem ? Did I miss any step, or does it come from the NAT ? How is the authentication managed by Dowload Station ? (Sorry for my english) Thanks.

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• Looking for a reliable Personal VPN Service

  - by user38673

  I am looking for a reliable personal VPN service so that I can access sites like Pandora or Hulu even when I am not physically in the US. I have been using StrongVPN but their service is not reliable. Here are some of my key requirements: Fast Reliable I don't mind paying a reasonable fee Unlimited traffic I just need PPTP support US IP addresses No software installation needed Supports Mac Any recommendations? Thanks.

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• Killing CLOSE_WAIT sockets without killing parent process on Linux

  - by Alex Neth

  Tomcat is leaving me with CLOSE_WAIT sockets which ultimately saturate the maximum number of connections. I've tried many methods in my client and server code to get rid of these to no avail, including closing connections, calling System.gc(), etc. Now I'm trying to find a way to simply time these out quickly in the OS. I've got conntrack working, but am not sure how to use that to kill these connections. I've also set /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait to 1, which of course is too low but the connections persist. Is there a way to kill these zombie sockets? Running Ubuntu.

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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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• 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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• Configure Wireless Network Card

  - by Skizz

  I recently upgraded the wireless network card in my Ubuntu PC from an 802.11g to an 802.11n. Now, it can't see my router. It doesn't appear in the list of networks that is displayed when you click on the NetworkManager icon in Gnome. Other networks are listed and I have connected to them (no password required!). I'm using the Windows driver through ndiswrapper and it can see the card. I tested the card in a Windows PC and everything worked. The router's log doesn't show any messages coming from the wireless card. What have I done wrong? If you need any more information, just leave a comment and I'll get add it to the question.

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• Dual-WAN router

  - by aix

  I am looking for a router that would fit the following requirements: Two WAN interfaces: the primary is PPPoE, the secondary will link to a GigE port on another router (a 100Mbps link will suffice); Two (ideally four) GigE LAN ports; No requirement for a firewall; No requirement for Wi-Fi; Inexpensive. The plan for the two WAN interfaces is as follows. All outbound traffic will go to the primary, with exceptions based on destination IP/subnet or possibly on src+dest IPs/subnets. Such exceptions should be routed to the secondary. It would be very nice if, should the primary go down, the secondary would automatically take over for all outbound traffic. I am reasonably sure that I can put something together based on dd-wrt. However, I'd like to hear from you what alternatives are out there (especially something easier to set up for my use case, even if it means paying more for the hardware.)

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• Self-connecting printers

  - by Martin Cerny

  Hello, I work as an administrator in a small company using XP Professional on all computers and two servers with Win 2003 Server. Recently a very unusual problam occured one of the computers keeps connecting to all the printers on the network it doesn't matter if it's an administrator or Domain User as soon as somebody logs in the commputer connects all the printers. The printers are either installed on local computers or on the server and shared. There is no log-on script connecting the printers, I install them manualy and none of the other computers shows such behaviour. We have a printer which is installed on two computers and both of them share it (I'm moving it to Server from a small PC which shared it up to now, but some computers still use the old connection), meaning this specific computer connects to one of the printer two times and it can't use either of the connections. How to prevent this self-connecting to all printers (none of the other computers has this problem). If I delte them from the "Printers" folder everything works fine untill I reconnect and the Folder is once again full of all the printers we have. I solved the smaller problem, computer is now capable of printing on all of the printers (it seems there have been some registry issues), after cleaning the registry and reinstalling the printer it seems to work just fine. But the second thing prevails, the computer connects to all the printers in the network (when I remove one/multiple it is reconnected right after the next log-in by any user).

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• Tomato/DD-WRT router to act as switch & only NAT some port

  - by fseto

  BACKGROUND: I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? EASY SOLUTION: would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since: my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device. Besides, what would be the FUN in that? =) IDEA: So what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router? +------+ | CM | +--++--+ || +----WAN---------------+ | / \ Router | | BR1? BR0 | | | \ | | | {NAT} | | | / | | \ | +-P0----P1-P2-P3-Wifi--+ | +------+ |Device| +------+

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• Windows file sharing connects over WiFi instead of LAN

  - by zacaj

  I have a laptop and a desktop computer, and I need to sync lots of files to the laptop and back whenever I go on a trip, etc. I've got a LAN cable connected into an extra port on the desktop that I plug into the laptop so I can get gigabit file transfers instead of wireless G. They connect fine. If I do an FTP transfer, for instance, using the LAN IP addresses, it goes at ~40MB/s, as it should. However when I copy files using explorer and native windows file sharing it detects the other computer by name, not IP (eg \\DESKTOP-PC\ instead of \\192.168.0.100\) and always connects to it by its wireless IP address instead of the faster LAN address. Both computers are running Windows 7. I have tried editing the priorities of the adapters in Advanced Settings and putting the LAN adapters above the wifi ones, but this didn't have any effect

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• How to create a separated network to customers only?

  - by Valter Henrique

  I work in a company where we have a network ethernet and wi-fi, we would like to create a network where our customers could access our network but don't have access to our computer network. This access would be internet only, nothing more. The customers will not see our computers and the files that we share in our network. I have two routers, how can I do this ? A Cisco Linksys Wireless-N Broadband Router WRT160N V3 and a Netgear Wireless G Router WGR614 v9 and about firewalls there´s only windows firewalls in each computer by default.

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• Windows 7 Firewall configuration

  - by Will Calderwood

  I had a PC set up with a VPN. I used the Windows 7 firewall to block all NON-VPN traffic to the internet, but all LAN traffic was allowed. So, with the VPN connected I could connect to all networked machines and the internet. Without the VPN connected I could only connect to the LAN and had no internet access. Unfortunately my drive failed, and I'm setting up the machine again with a replacement drive. I can't for the life of me work out how to set up the firewall again. I can easily set it up to block all NON-VPN traffic, but can't work out how to that and still allow all LAN traffic whether the VPN is connected or not. Some pointers would be useful. Thanks.

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• SCP command Clarification

  - by david.colais

  I'm using the scp commands to pull some files from the remote server and one variation of the command is not working. I have 2 files names one.xml and two.xml in a remote server and I'm pulling these two files into the current dir using the following command: scp [email protected]:/student/class/Intermediate/one.xml . scp [email protected]:/student/class/Intermediate/two.xml . The above command works fine but if I use wildcards to pull all the xml files in a single shot as shown below it returns scp: No match. scp [email protected]:/student/class/Intermediate/*.xml . Why is it working if I pull the files individually and not working if I try to pull using wildcards.

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• Wireless Network Question?

  - by wifi

  Will the D-Link - Xtreme N Wireless-N Gigabit Router work with my AR5009 802.11 a/g/n WiFi Adapter?

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• Understanding tcptraceroute versus http response

  - by kojiro

  I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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• Remote kill, upload, execute file

  - by Masoud M.

  I'm developing a program and I need to upload my xyz.exe file to many host machines and execute them frequently. I need a server-client tool to do it as below steps after an update signal from my PC: Those host machine should kill any running processes with name xyz.exe. Download my new xyz.exe. Then execute new xyz.exe. I know about some tools like PsExec, but I need a tools with better user-interface and more powerful. Is there any tool to do it ? UPDATE: The systems are in a same LAN, OS is windows (XP or 7), No full remote access is needed. I'm a developer and my program should run in remote hosts and I'm testing my application.

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