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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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• Creating a network link between 2 very close buildings

  - by Daniel Johnson

  I have a charity who have two adjacent medium sized modern detached houses (in the UK): the buildings stand next to each other and are less than 5 metres apart. They have DSL connected to a single computer in one of the buildings. They want to add a network with wireless, and want it to work across both buildings. Being a charity they need to keep costs down. The network would be used for sharing Word documents, e-mail, browsing and skyping. My initial thoughts were to connect the buildings with fibre. So: Option 1 Use fibre between the buildings. Sufficient cable and two TP-LINK MC100CM Fast Ethernet Media Converters. Cost ~£80.00. But there is the extra cost and hassle of running the cable down and up the external walls, lifting and relaying paving, and burying underground. Never having fitted fibre I'm also a little worried about going up the wall and then bending the cable at 90 degrees to go through the wall and into the building. Option 2 Use two TP-Link TL-WA7510N High Powered Outdoor 5Ghz 15dBi Wireless antennas to connect the buildings. There is a clear line of sight at first floor level. Cost ~£100. And much easier to fit than fibre! Is using the TL-WA7510Ns overkill? Is there something more suitable? I had hoped to use some Netgear stuff, e.g. two DGN2200, one in each house and also use them to provide the wireless link between the buildings. However, in bridge mode wireless client association is not available and repeater mode with client association only supports WEP security which isn't strong enough. Is there something similar that would be up to the job? Option 3 Connect the buildings with UTP cable. My concerns here are risk of electric shock due to a difference of potential between the buildings (or are they so close this shouldn't be an issue) and protection from lightning strikes. Is fitting lighting arrestors expensive? And what can be done to ameliorate against the risk of shock? This all falls outside my area of expertise so I would really appreciate some advice.

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• setup PXE (i.e. DHCP + TFTP) server on MacOSX

  - by Albert

  What is the easiest way to setup an PXE server (i.e. a DHCP server + TFTP server) on MacOSX? Is there maybe some easy-to-use tool which just comes with both servers builtin? I have done that in the past but I remember that it took me several hours of editing some config files of tftpd (I think) and different versions of dhcpd, many trials and errors until I got it working (mostly). Now I have a fresh MacOSX installation and I want to avoid any complicated setup.

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• Wifi randomly drops on Windows 8 laptop

  - by JosiahS

  First of all, I did a lot of research on this problem, and I wasn't able to come to any helpful conclusion. I've finally decided that I need advice from those who might know where to look. So don't let me down. :P I used to have an older Windows 7 laptop, which worked great for basic office and web browsing. However, I wanted something that would play actual modern games. So I recently bought a Sager NP8235 with the Intel Wireless-AC 7260 wifi card, and installed Windows 8 Pro on it. And ever since, I've been having problems with the wifi. Generally, what happens is if I leave the laptop on but inactive for an extended amount of time (I've estimated it around an hour to two), the wifi will start dropping randomly. If I happened to have a download going at the time, it usually causes the download to fail. Or, if I put the laptop to sleep overnight, the next morning I usually have to restart the computer because the wifi device apparently stops working (it literally won't turn on). Also, and most frustrating, whenever I'm on a video chat (like Skype), after about ten minutes, the connection will start lagging like crazy, until it forces Skype to end the call. After that, I usually have to disable and reenable the wifi to get it working again. I know it isn't our internet, because all the other computers in our house (~8) don't have any issues. Even the old Windows 7 laptop (connected also over wifi) works just fine, scoring the normal ~3Mbps average on speedtest.net (yes, I know our internet is slow, we live out in the country). Additionally, when I connect the Sager directly to the router via ethernet, the internet instantly starts working just great. Like I said, I've done a lot of googling to figure out what's going on, and I haven't been able to find anything that worked for me. Is it Windows 8 conflicting with the Wifi drivers? As of this writing, I have the Intel drivers v16.1.5.2 installed (without the extra Intel software). Or is it our router? It's a TP-Link TL-WR841ND, set to the default settings. The Sager is currently being assigned to a static IP, if that makes any difference. And yet, the old windows 7 laptop has a much more stable connection than the Sager. Anyone have any ideas? At this point, I'd appreciate even knowing what the problem is.

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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• Divide a network into two subnets of equal size

  - by kylex

  I have been given the following IP 192.168.14.137/25 and asked to divide the network into 2. This is what I've come up with: The subnet mask is therefore 255.255.255.128 The network address is 192.168.14.128 There are a total of 128 available addresses (including the network address and broadcast address) To divide the network we create to subnets: 192.168.14.128/26 192.168.14.192/26 This will have a subnet mask of 255.255.255.192 Am I missing anything, or is this correct?

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• What are potential reasons a user could be connected to a home network, but not to the internet?

  - by Matthew

  I have a friend that recently started using Ubuntu, and I've been answering his questions via the internet. However, I'm stuck on this one. He bought Linksys WPC11 wireless card, and says he was able to create a network connection, but was unable to ping or use a browser. I'm not quite sure where to start in figuring this out--what are some common causes of this sort of problem?

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• how to install Wimax Dongle over Ubuntu?

  - by Mosh

  i have Asus Wimax Dongle and it has an Independence software from the Asus company requires user name and password and its running will over windows 7 now i've tried ubuntu 10.10 but nothing happens when i plug the dongle into usb. in windows if you plugs it for the first time, an application wizard begins and you can find a virtual cd in my computer but i cant find it in Ubuntu now i would install it over ubuntu, how? toast for all

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• Port forwarding with multiple IP's

  - by Jon

  I work at a company which uses a Fortigate 60 router, something I'm not really familiar with. Everything worked fine with it until a week ago when Comcast came in and replaced our modem. It seemed as though the process went smoothly - our connection came back up and our static IP remained the same. However, none of our port forwarding is working. What has me confused is the Comcast modem apparently has two IP addresses. The WAN2 interface for it in the Fortigate router is set to 10.1.10.10. However, all of our port forwarding settings are set to an external IP address of 10.1.10.50. Now this setup used to work fine, so something with the Comcast modem must have changed. How can I find out what? I tried setting a computer to a local IP of 10.1.10.15 so I could open up the web interface for the modem, but I can't even ping 10.1.10.10 when I do that. Any ideas? Thanks!

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• Why can't my networks reach each other?

  - by HOLOGRAPHICpizza

  We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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• ipv6 with KVM on debian

  - by Eliasdx

  I have trouble setting up IPV6 on my Proxmox (KVM) server: My ISP sent me this information(xxx=placeholder): IPs: 2a01:XXX:XXX:301:: /64 Gateway: 2a01:XXX:XXX:300::1 /59 This is the interface setup on the host server: auto vmbr1 iface vmbr1 inet static address 178.XX.XX.4 broadcast 178.XX.XX.63 netmask 255.255.255.192 pointopoint 178.XX.XX.1 gateway 178.XX.XX.1 bridge_ports eth0 bridge_stp off bridge_fd 0 iface vmbr1 inet6 static address 2a01:XXX:XXX:301::2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del 2a01:XXX:XXX:300::1 dev vmbr1 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev vmbr1 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev vmbr1 On the guest: auto eth0 iface eth0 inet static address 178.xx.xx.47 netmask 255.255.255.255 broadcast 178.xx.xx.63 gateway 178.xx.xx.1 pointopoint 178.xx.xx.1 iface eth0 inet6 static pre-up modprobe ipv6 address 2a01:XXX:XXX:301::2:2 netmask 64 up ip -6 route add 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del 2a01:XXX:XXX:300::1 dev eth0 up ip -6 route add default via 2a01:XXX:XXX:300::1 dev eth0 down ip -6 route del default via 2a01:XXX:XXX:300::1 dev eth0 Ipv4 works on both host and guest but Ipv6 only works "sometimes". It's up for minutes and then down again until I change something. However I can actually ping the host and the guest from both host and guest. host:~# ip -6 neigh 2a01:XXX:XXX:301::100:2 dev vmbr1 lladdr 00:50:56:00:00:e0 REACHABLE 2a01:XXX:XXX:300::1 dev vmbr1 lladdr 00:26:88:76:18:18 router STALE host:~# ip -6 route 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 2a01:XXX:XXX:301::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev vmbr1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev tap101i1d0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via 2a01:XXX:XXX:300::1 dev vmbr1 metric 1024 mtu 1500 advmss 1440 hoplimit 4294967295 Does someone know why it isn't working? And is there a way to configure multiple v6 IPs from the same subnet so I can dedicate IPs to websites on a server with multiple virtualhosts?

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• Hooking up a multifunction printer via network and USB

  - by C-dizzle

  I have a Dell 2155CDN Multifunction printer that is hooked up through our network. But when using the scan feature, it is terribly slow, and I assume it has something to do with it scanning through the network port. Is it possible to leave the printer hooked up across the network, but also attach it to a computer via USB just for the scanner? Or would doing this confuse the printer not knowing which port to use for each feature?

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• How to access an node of an LAN via WAN?

  - by gilzero

  Lets say I have a router that is connected to the Internet. An WAN IP address is given by ISP. It is using PPPoE ADSL, the IP address is not static, every time it connected, assigned a different IP address. There is an web server 192.168.0.100 running in the LAN. I heard something like DMZ + DynDNS can do the job? But not sure what these are and how they work. Any there way(s) to access the local node 192.168.0.100 via WAN, so that I can reach that node even I am not home. Thanks for any advice.

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• Prevent users from Router 2 seeing Router 1 computers

  - by Patrick Robert Shea O'Connor

  I've got 2 Netgear N300 (WNR2000v3) routers. Here's my setup: Modem Router 1 Private Users/Router 2 Public Wireless Users on "Guest" Network. I want to prevent users who are connected to Router 2's "Guest" network from accessing anything that is connected to Router 1. There is an option when setting up the "Guest" network called "Allow guest to access My Local Network" which I thought if unchecked would do this very thing; however, I can still access files and such of computers connected to Router 1. Router 1 assigns 192.0.0.x IP addresses, Router 2 assigns 10.0.0.x IP addresses, how can they even see each other? Do I need to change the subnet or something else?

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• Switch to IPv6 and get rid of NAT? Are you kidding?

  - by Ernie

  So our ISP has set up IPv6 recently, and I've been studying what the transition should entail before jumping into the fray. I've noticed three very important issues: Our office NAT router (an old Linksys BEFSR41) does not support IPv6. Nor does any newer router, AFAICT. The book I'm reading about IPv6 tells me that it makes NAT "unnecessary" anyway. If we're supposed to just get rid of this router and plug everything directly to the Internet, I start to panic. There's no way in hell I'll put our billing database (With lots of credit card information!) on the internet for everyone to see. Even if I were to propose setting up Windows' firewall on it to allow only 6 addresses to have any access to it at all, I still break out in a cold sweat. I don't trust Windows, Windows' firewall, or the network at large enough to even be remotely comfortable with that. There's a few old hardware devices (ie, printers) that have absolutely no IPv6 capability at all. And likely a laundry list of security issues that date back to around 1998. And likely no way to actually patch them in any way. And no funding for new printers. I hear that IPv6 and IPSEC are supposed to make all this secure somehow, but without physically separated networks that make these devices invisible to the Internet, I really can't see how. I can likewise really see how any defences I create will be overrun in short order. I've been running servers on the Internet for years now and I'm quite familiar with the sort of things necessary to secure those, but putting something Private on the network like our billing database has always been completely out of the question. What should I be replacing NAT with, if we don't have physically separate networks?

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• Multiple WAPs: Bandwidth, Frequency Considerations

  - by Pete Cresswell

  The router in my LAN closet does 2 and 5 GHz. In the kitchen, I have a single-band 2 GHz WAP, and in the garden shed I have another single-band 2 GHz WAP. All are set to Bandwidth = 40 MHz, Wireless Network Mode = N-Only. The kitchen WAP and the LAN closet router both come up with multiple bars on my smart phone from almost anywhere in the house. The garden shed WAP will register one bar... but only sometimes. The Questions: Are these things in danger of butting heads? Should I re-set them to Bandwidth = 20 MHz? Bandwidth = Auto? Are there any tools that I could use on an Android smart phone, iPod, or WiFi-enabled laptop to make my own analysis?

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• What is the simplest way to confirm or to disprove that Virtual Box virtual machines support GRE protocol

  - by mbaitoff

  It is stated in VirtualBox manual (chapter 6) that VM network interfaces in "NAT" mode do not support GRE protocol. I'm currently trying to setup a pair of VMs as pptp server and client which would communicate via VM's network interfaces in "INTERNAL NETWORK" mode. I set up modern Linux OSes with pptp software on both machines and made some basic pptp configuration. However, I fail to connect the client to the server - server reports a failure when writing to GRE socket. I now need a quick proof of principal ability to use the GRE protocol between VirtualBox VMs over a network in "INTERNAL" mode, such as a several-line .c program that would try to open/send/receive/close a GRE protocol connection, or like a specific lightweight tool to diagnose the GRE availability. Any suggestions?

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• How to configure Amazon Security Groups to achieve multi-tier architecture?

  - by ks78

  What is the preferred way to configure Amazon Security Groups to achieve a multi-tier architecture? Each of my instances has its own Security Group, which I only want to use for rules specific to an instance. I'd like to keep any rules which apply to multiple instances in a separate Security Group, which can then be assigned to instance Security Groups as necessary. As an example, I've setup a group called "admin", which allows administrative access from my IP. I added the "admin" group as the source to each of my instance security groups. However, I still can't access the instances from my IP without adding the rules directly to the instance's group. Am I missing something? Although it seems a multi-tier security architecture should be possible, it doesn't seem to be working.

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• Snow Leopard takes a long time to connect to Windows/Samba server

  - by hood

  We run a very heterogeneous network here: There is some XP, Vista, 7, Leopard, Snow Leopard clients, and Windows 2003 (one remaining legacy app), 2008, and Linux servers. The main file server runs Ubuntu Linux and has been added to the Windows Domain and has been used for many years; SBS 2008 is the PDC (the 2003 and 2008 are on the domain also). In Leopard there were no problems at all authenticating to the file servers. We've upgraded one of the Leopard iMacs to Snow Leopard, though the same problem occurs in a new MBP which came with the newer OS as well as a clean install on another iMac. It does not matter whether connected through wired or wireless. In the Finder when clicking on the server - whether on first boot or after it is connected - it will display "Connecting..." for up to a few minutes before either generally working (if username/password in keychain) or displaying "Connection Failed" - at which time clicking "Connect As" and typing in the username/password will take some more time and eventually work. Sometimes it will display "Connecting..." indefinitely. (I've left it as long as 15 minutes before trying something else) Accessing shares on the the 2003 and SBS servers have the problem (so I don't think it's a Samba server issue). The Server 2008 Standard is connecting instantly at the moment. Accessing the share through an alias/stacks doesn't have this problem. Leopard and Windows clients still have no problem. I've searched Google but hasn't yielded any working result. How do I get rid of this delay?

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• Laptop loses signal from WiFi router, but mobile phone holds it fine

  - by Anton

  I have an extremely weird issue with my WiFi router. Both Ubuntu & Windows 7 can connect to it fine, but after 5-10 minutes browser (any one) stops opening pages and tells me it cannot resolve host address. But, at the same time, tools like Skype or BitTorrent work without any issues. I can also browse Internet on my mobile phone connected to the very same router. If I reset router it helps, but after 5-10 minutes I see just the same problem... Ubuntu tells me that WiFi signal is lost (mobile sees it), Windows 7 just won't let me browse anywhere. Can anyone give me a suggestion on this, please? Thanks

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• Configure linux machine as bridge/switch and end device

  - by leemes

  At my home, I have two desktop PCs in two rooms. The router / DSL modem is in one of these rooms. Now I want to configure a home server (having 2 LAN ports, running 24/7) in the corridor between the two rooms, using only one LAN cable at each door. This gives me the following physical configuration: (door) (door) .----/-/----. .-----/-/----------._ FritzBox | | | .----´´ DSL Router PC1 Server | PC2 As just said, the server has 2 network interfaces and is running Ubuntu. What I need now is a network configuration which enables both the server and PC1 to connect to the router. I think the server needs to serve as a bridge or switch. Currently, all computers are configured having static IP addresses. If I'm understanding it correctly, a bridge / switch doesn't have its own IP address, but as the server needs to be configured as an own end device, it needs to have one. My first question is, do I have to configure both interfaces separately, giving both the same static IP address? My next question is, how do I bridge the two physical networks into one? I have basic understanding (but am always confused again and again) of bridges and switches, but I don't know how to configure it in software. I only know that it's possible to do so :) The third question is: Is it possible to configure this in a way that network packets from/to PC1 to/from the router only go through hardware or only consume low CPU in the server? Can you help me? Thanks in advance!

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• How to securly join two networks together over the Internet?

  - by Pyrolistical

  Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you need a domain controller, or can you do this with workgroups? EDIT The obvious solution seems to be VPN, but can VPN be implemented on the routers only? Can the computers on the network be configuration free?

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• DNS server setting resets on reboot

  - by Vaibhav Bajpai

  I recently changed my physical location, and had to change my DNS server setting in network preferences. However my Mac reverts back to original DNS server IP address on each reboot and I have to manually change it everytime. How can I make my changes persist on reboot? I am running Snow Leopard 10.6.7 UPDATE This is has started to occur since the time I restored my entire system from TM backup.

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• How can I find out who is using my Windows Internet Connection Sharing (ICS)?

  - by Xavierjazz

  This is related to the question, "Can I monitor who is using my Mac OS X Internet Sharing?" but while that deals with Mac OS X, my questions is about Windows XP. How do I find out who is sharing my internet connection on XP Pro?

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