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• All nework interfaces hang for seconds while one interface goes up/down

  - by user3698377

  I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication on other interfaces hangs for several seconds. I could reproduce this behavior without my application in a simple way: there are 2 interfaces available on computer 1 ( Ethernet and WiFi ) ping from computer 2 the IP address of the Ethernet connection of computer 1 disconnect the WiFi of computer 1 ping hangs for seconds, and then the packets are traveling again between the 2 computers. The hanging happens as well if I turn back on the WiFi connection on computer 1. It happens as well if I ping the WiFi IP, and turn off/on the Ethernet connection ( or unplug/plug the cable). I am using Linux Ubuntu 12.04 on both computers. Any ideas why is this happening, and if / how can it be avoided?

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• How to access web server of any machine of my network from the outside

  - by Luc

  Hello, I have an ip like username.dyndns.org, this is the external IP of my router. On my lan, I have several machine (m1, m2, ...) , each running a dedicated web server. Is it possible to reach each machine from the outside with something like: http://m1.username.dyndns.org http://m2.username.dyndns.org ? Do you know what needs to be configured in my router for NAT ? Also, is there a special directive in Apache to do so ? Thanks a lot, Regards, Luc

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• Configure LAN Router To Prevent Illegal Torrenting?!

  - by Goober

  Scenario I have a typical broadband setup at home (It's a flatshare I have no control over who uses the house) and I want to prevent anyone using it from illegally downloading via torrents etc. Question Is there a way in which I can configure the router to block all forms of illegal downloads?

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• Disk IO causing high load on Xen/CentOS guest

  - by Peter Lindqvist

  I'm having serious issues with a xen based server, this is on the guest partition. It's a paravirtualized CentOS 5.5. The following numbers are taken from top while copying a large file over the network. If i copy the file another time the speed decreases in relation to load average. So the second time it's half the speed of the first time. It needs some time to cool off after this. Load average slowly decreases until it's once again usable. ls / takes about 30 seconds. top - 13:26:44 up 13 days, 21:44, 2 users, load average: 7.03, 5.08, 3.15 Tasks: 134 total, 2 running, 132 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 25.3%id, 74.5%wa, 0.0%hi, 0.0%si, 0.1%st Mem: 1048752k total, 1041460k used, 7292k free, 3116k buffers Swap: 2129912k total, 40k used, 2129872k free, 904740k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1506 root 10 -5 0 0 0 S 0.3 0.0 0:03.94 cifsd 1 root 15 0 2172 644 556 S 0.0 0.1 0:00.08 init Meanwhile the host is ~0.5 load avg and steady over time. ~50% wait Server hardware is dual xeon, 3gb ram, 170gb scsi 320 10k rpm, and shouldn't have any problems with copying files over the network. disk = [ "tap:aio:/vm/dev01.img,xvda,w" ] I also get these in the log INFO: task syslogd:1350 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syslogd D 00062E4F 2208 1350 1 1353 1312 (NOTLB) c0ef0ed0 00000286 6e71a411 00062e4f c0ef0f18 00000009 c0f20000 6e738bfd 00062e4f 0001e7ec c0f2010c c181a724 c1abd200 00000000 ffffffff c0ef0ecc c041a180 00000000 c0ef0ed8 c03d6a50 00000000 00000000 c03d6a00 00000000 Call Trace: [<c041a180>] __wake_up+0x2a/0x3d [<ee06a1ea>] log_wait_commit+0x80/0xc7 [jbd] [<c043128b>] autoremove_wake_function+0x0/0x2d [<ee065661>] journal_stop+0x195/0x1ba [jbd] [<c0490a32>] __writeback_single_inode+0x1a3/0x2af [<c04568ea>] do_writepages+0x2b/0x32 [<c045239b>] __filemap_fdatawrite_range+0x66/0x72 [<c04910ce>] sync_inode+0x19/0x24 [<ee09b007>] ext3_sync_file+0xaf/0xc4 [ext3] [<c047426f>] do_fsync+0x41/0x83 [<c04742ce>] __do_fsync+0x1d/0x2b [<c0405413>] syscall_call+0x7/0xb ======================= I have tried disabling irqbalanced as suggested here but it does not seem to make any difference.

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• How to block annoying facebook and other social network widgets

  - by lesmana

  We have facebook buttons, twitter buttons, linkedin buttons, google+ buttons, stumbleupon buttons, younameit buttons. These social network buttons and widgets are creeping up the internets like the plague. Sometimes even with cool javascript popups which obscure content if moused over. How can I get rid of them? I mean stuff like this: and this: and last but not least, this: How can I get rid of them?

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• How to block & unBlock gMail chat as an system administrator

  - by sagar kothari

  I would like to know, How to block & unblock gmail chat as an system administrator. Thanks in advance for sharing your knowledge.

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• Best way to script checking whether a machine is on the corporate network

  - by Ben

  I am writing a Powershell script to determine if a machine is on the corporate network. The machine may or may not be on the domain, so I want to check at "IP" level. Have written something to check by pinging a couple of servers on a couple of different subnets (to get around the risk of someone being on another (external) subnet with a host on the same IP.) Works, but it's a bit slow, and not especially "future-proof" - e.g. in 2 years time when I decomission the server it'll break. Is there a way I can use the dns suffix being given by the local dhcp server? Just direct me what I need to check - I can figure out the script. Ta, Ben

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• Chrome pop-up blocker fail?

  - by Count Zero

  I have this problem since just a few days. I've been a heavy Chrome user for several years, but it never happened before: Sometimes absolutely uncalled for pop-ups appear, when I click something absolutely legit. It seems to happen at a very precise rate of two pop-ups every hour or so. The pop-ups are not very varied, it seems to be a fixed set of some 4-5 ads. At first I thought I caught some malware, but after a full scan with Malwarebytes Anti-Malware, I found absolutely nothing. In addition the problem exists only with Chrome. When I use Firefox, this never ever happens. What is even more puzzling is that it happens on both of my rigs and started on the same day. I have a removable storage that I dock to both of them and access one machine from the other via RDP, but still... It seems this is a problem that others face too. See this Google forum and here. Could it be that the latest Chrome build is just acting up? (Just in case it matters: I run Chrome version 24.0.1312.57 m on Win 7.)

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• http server connectivity puzzle

  - by jpmartins

  I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance the system is working fine, the next requests stop arriving at the IHS. Telnet directly to port 80 of the IHS is established sucessfully, but connection to the port 80 through the IP of the load-balancer fails! The puzzle comes next, the network admins say the load-balancer is working fine. When we finally reboot the IHS servers and request start flowing... The situation happened three times the last month and no obvious pattern was found. Any debug ideas?

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• Website filtering for OpenVPN clients

  - by Asche

  I am currently trying to block some websites by their domain names for all the clients of my OpenVPN server. My first idea was to use the /etc/hosts file. But, its effects seem to be limited to the host only and not to be taken in consideration by OpenVPN. I then tried to configure bind9 and to interface it with OpenVPN, but that solution was unsuccessful and uneasy to use. After this, I considered using iptables to drop all the packets from/to those websites but that forum thread made me thought otherwise since iptables' behavior with FQDN may generate complex issues. Have you got a solution to block websites for all clients using an OpenVPN server on which I am root?

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• DNS Problem in my notebook [closed]

  - by user20989

  i have windows 2003 server domain environment in my office. my server ip is: 192.168.1.2 if i put this IP in DNS of my laptop network card my folder SYNC works fine & also internet work fine in office. but internet did't work in my home for that i need to change DNS again to Auto & internet start working again. its too difficult to change cause some time i don't have administrative password. is there any solution to that? Thanks

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• OpenVPN: Route all traffic through server from client config

  - by Marc

  Is it possible to somehow force all IP traffic through our corporate OpenVPN server by just changing the client config?

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• NFS-shared file-system is locking up

  - by fredden

  Our NFS-shared file-system is locking up. Please feel free to ask any questions you feel relevant. :) At the time, there are a lot of processes in "disk sleep" state, and the load averages on our machines sky-rocket. The machines are responsive on SSH, but our the majority of our websites (apache+mod_php) just hang, as does our email system (exim+dovecot). Any websites which don't require write access to the file-system continue to operate. The load averages continue to rise until some kind of time-out is reached, but for at least 10-15 minutes. I've seen load averages over 800, yet the machines are still responsive for actions which don't require writing to the shared file-system. I've been investigating a variety of options, which have all turned out to be red-herrings: nagios, proftpd, bind, cron tasks. I'm seeing these messages in the file server's system log: Jul 30 09:37:17 fs0 kernel: [1810036.560046] statd: server localhost not responding, timed out Jul 30 09:37:17 fs0 kernel: [1810036.560053] nsm_mon_unmon: rpc failed, status=-5 Jul 30 09:37:17 fs0 kernel: [1810036.560064] lockd: cannot monitor node2 Jul 30 09:38:22 fs0 kernel: [1810101.384027] statd: server localhost not responding, timed out Jul 30 09:38:22 fs0 kernel: [1810101.384033] nsm_mon_unmon: rpc failed, status=-5 Jul 30 09:38:22 fs0 kernel: [1810101.384044] lockd: cannot monitor node0 Software involved: VMWare, Debian lenny (64bit), ancient Red Hat (32 bit) (version 7 I believe), Debian etch (32bit) NFS, apache2+mod_php, exim, dovecot, bind, amanda, proftpd, nagios, cacti, drbd, heartbeat, keepalived, LVS, cron, ssmtp, NIS, svn, puppet, memcache, mysql, postgres Joomla!, Magento, Typo3, Midgard, Symfony, custom php apps

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• How can I setup a Firewall without NAT?

  - by SRobertJames

  We have 16 IP addresses from our ISP, and are setting up a SonicWall Firewall. I'd like to have the SonicWall do NAT for the LAN, but act as a firewall only (no NAT) for the servers which are using some of the 16 addresses. How do I set this up? If I set the WAN's subnet to include the 16 IPs, the SonicWall won't route the traffic to the LAN interface. Should I set the WAN subnet to only include the ones we are dedicating for NAT, and then keep the others on the LAN? Related point: How can I set multiple IP addresses for a SonicWall LAN interface?

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• Adding localhost entry to Windows\System32\drivers\etc\hosts file with port number

  - by Kamyar

  I have set up a local site under IIS 7.5 under port 900. to access it I should type localhost:900 in the address bar. I'm a little bit familiar with the System32\Drivers\etc\hosts file and I know I can define my custom name with IP adderss there. For example I can add: 127.0.0.1 MyLocalSite and whenever I type in http://MyLocalSite in the browser, The DNS resolves its IP as 127.0.0.1. Is there anyway that I can specify port number in that file as well? (e.g. 127.0.0.1:900 MySecondSite and the DNS resolves it correctly) I tried 127.0.0.1:900 and 127.0.0.1::900 with no luck.

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• Is it possible to host a web server from behind a NAT

  - by iamrohitbanga

  My PC is behind a NAT router that has a public IP address. If I want to host a website then I believe I need a domain name which I can purchase from some site which would pledge to resolve all DNS requests for that domain name and send the IP address of my NAT router (assuming I do not want to host my domain name on their servers). Now I want to host a web server on my computer. What changes should be done to the NAT router's configuration to forward all HTTP requests for example.com to my PC in the internal network. Is the above strategy correct? Is it commonly used?

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• What router hardware or software should be used when multiple public IPs are routed into the same LAN?

  - by lcbrevard

  I am looking for recommendations to replace a set of consumer grade (Linksys, Netgear, Belkin) routers with something that can handle more traffic while routing more than one static public IP into the same LAN address space. We have a block of static public IPs, 5 usable, with Comcast Business. Currently four of them are in use for: General office access Web server Mail and DNS servers Download and backup web server for separate business All systems (a mixture of physical and virtual) are in the same LAN address space (10.x.y.0/24) to enable easy access between them inside the office. There are 30 or more systems in use depending on which virtual machines are currently active. We have a mixture of Windows, Linux, FreeBSD, and Solaris. Currently a separate consumer grade router is used for each of the four static addresses, with its WAN address set to the specific static address and a different gateway address for each: uses 10.x.y.1 - various ports are forwarded to various LAN IPs on systems with gateway 10.x.y.1 uses 10.x.y.254 - port 80 is forwarded to a server with gateway 10.x.y.254 uses 10.x.y.253 - ports for mail and dns are forwarded to a server with gateway 10.x.y.253 uses 10.x.y.252 - ports as needed are forwarded to server with gateway 10.x.y.252 Only router 1. is allowed to serve DHCP and address reservation based on the MAC is used for most of the internal "server" IP addresses so they are at fixed values. [Some are set static due to limitations in the address reservation capabilities of router 1.] And, yes, this really does work! But... I am looking for: better DHCP with more capable address reservation higher capacity so I don't have to periodically power cycle the routers One obvious improvement would be to have a real DHCP server and not use a consumer grade router for that purpose. I am torn between buying a "professional" router such as Cisco or Juniper or Sonic Wall verus learning to configure some spare hardware to perform this function. The price goes up extremely rapidly with capabilities for commercial routers! Worse, some routers require licensing based on the number of clients - a disaster in our environment with so many virtual machines. Sorry for such a long posting but I am getting tired of having to power cycle routers and deal with shifting IP addresses afterwards!

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• Site getting blocked on corporate networks

  - by ajay

  Hi there, Our site is getting blocked in corporate networks across various companies, but not all. Would appreciate help on what could be the reasons for this and how we can resolve this? Attached are a couple of snapshots that customers have sent us from the companies where the site is getting blocked. http://www.freeimagehosting.net/uploads/2ca59a8460.jpg

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• switch OFF syn cookies

  - by Nick

  We have several servers they have public IP's, but work together (one is with Load Balancer, orther with Apache Web server, other with MySQL and so on. Most of the ports are fire-walled, so only "local" servers can be connect there. However ALL servers have some ports that must be publicly open. We have SYN Cookies enabled and from time to time we got: possible SYN flooding on port 8080. Sending cookies. Port 8080 is not public. How we can switch OFF SYN Cookies for some ports (e.g. 8080, 3306 etc) or from some sources (e.g. our servers), but in same time SYN Cookies to be switched ON for all other ports, e.g. port 80. We found this similar problem, except our servers are with public IP's: SYN cookies on internal machines

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• Use .htaccess to block *All* access to specific folders.

  - by Urda

  I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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• What are the methods of separating network spaces in a LAN?

  - by dash17291

  Please detail me the methods. My thoughts: put the servers in separate (sub)networks the servers are forced to go through the firewall but no NAT is required assign more IP addresses to the internal interface of the server choosing gateway addresses from the clients and servers IP address ranges split DNS Netfilter/{iptables, ipset} could be heavily involved, I'm talking about Linux servers. See for example: Destination NAT Onto the Same Network from internal clients Please do not explain what is NAT or DNS. This is a theoretical question, but my poor English knowledge prevent me to describe it in a fancy fashion.

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• Isolated Network Set-Up

  - by Isaac Kleinman

  I am looking to set up a small network for a client which would be isolated from his primary network. (I'm hoping to set-up the additional network as VMs on the primary network.) I've instructed the client to request a bunch of static ip addresses from his ISP, but I'm not sure how to proceed with setting this up. What hardware will I need and how do I go about the configuration? Heavy security is not my concern. All that's really required is that web requests from the two networks be presented to the outside world with different ip addresses.

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• Request to server x Reply from server y

  - by klaasio

  I need some advice from you guys: I'm dealing with a custom loadbalancer/software for which we will use 2 main servers and about 8 slave servers. In short: User sends request to main server, main server will receive and handle the requests, sends a request to a slave server and slave server should send data DIRECTLY to the "user". User - Main server Main server - Slave server Slave server - User The reason for which data should be send directly to the user and not through the main server is because of bandwidth and low budget. Now I have the following idea's: -IPinIP, but that is not possible in Layer7 (so far i know there some expensive routers for that) -IP Spoof, using C/C++ we will make it look like the reply came from main server. But I was thinking, perhaps the reply "slave server - User" could just come from a different IP without causing issues in the firewall from the user or his anti-virus. I don't know so well about "home" firewalls/routers and/or anti-virus software. I guess the user machine wouldn't handle it well?

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• What would prevent the same ActiveX control from downloading on one internal website but not another?

  - by ProfessionalAmateur

  We have two internal webservers for an application at my company, one is the development server and the other is production. This application server will deploy and install and ActiveX control to allow the use of specific functionality. The ActiveX control is the exact same on both servers. Last week suddenly when trying to install and run this ActiveX control from the development server stopped working. IE will still prompt the user to install it, but when select "Install this Add-on for all users on this computer", nothing happens. Another IE window pops open and immediately closes and that is it. It is almost as if a pop-up blocker is running (but it is not enabled). The kicker which has me completely stumped is that if we try the same thing on the Production server, everything works as we would expect. Items of interest: Both servers are in the 'Trusted Sites' No pop-up blocker in IE is activated ActiveX controls for Trusted and Intranet Sites are all enabled. Has anyone experienced something similar? I'm not a Windows administrator so please feel free to explain things as elementary as you see fit.

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• Response code for Chinese spiders? [closed]

  - by pt2ph8

  My server is being "attacked" by Chinese spiders that don't respect the rules in my robots.txt. They are being very aggressive and using a lot of resources, so I'm going to set up some rules in nginx to block them by user agent. Question: which response code should I return, 403, 444 (empty response in nginx) or something else? I'm wondering how the spiders will react to different status codes. What's the best practice?

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