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• What can cause a kernel hang on redhat 4?

  - by Ivan Buttinoni

  I've to solve a nasty problem on a ten machine "cluster": randomly one of these machine hang during an hard computation, sometime still ping sometime not. The problem was described me at the phone, I've still no touch/see these machine, so I can't be more precise. It seem there's no (real) keyboard or monitor linked to them, so I haven't nothing about keyboard led or messages on monitor. Don't worry, what I really need is some suggestion where to search the problem, some suggestions on what can cause a kernel hang on a working machine. I also see this post, but seem same need on a different situation. My ideas since now: - HW problem (ram, cpu, fan etc.) - bad autofs configuration - bad nfs(?) configuration - presence of a trojan/hacker/etc - /dev/"swap" linked to /dev/zero - kernel out of memory(??) - kernel bugged In other words I try to imagine what kind of envent can occour that can crash the kernel insted of the application that generate the event. What hang have YOU experienced before? Write it to me! TIA

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• Remote paging with Nagios when network is down and email won't work -- cellular modems and alternatives

  - by Quinten

  What is the best option for remote paging when network services are down? I'm looking for a solution that can let me know when network services are down during off-hours only, and especially when email/smtp services are out. Therefore, it needs to be redundant to our network and power supply. I'm imagining a cellular modem is one option. What's the price range for these? Is anybody using them and feel that they are worth the cost? I'm imagining that it's something we would end up sending an emergency page ~ 1x/month at most, so I'd like the pricing to reflect that--I don't mind a high per-page cost as long as it has a low recurring cost. Another option would be to expose at least one server to remote ping, and run a check script on a remote server. Are there paid options for this? Currently, we run Nagios on a Linux VM on a Windows 2008 Hyper-V host. It would be great if the solution would work in that environment, but I know it's tricky with external devices, and we could move Nagios to a standalone workstation if needed.

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• Routing table on Linux not respected

  - by MRHaarmann

  I have a very specific problem, building a Linux VPN endpoint (with external VPN Gateway), which should route certain networks over the tunnel, others via default gateway. The Linux VPN should do a NAT on the outgoing connections for the VPN peers. Setup is as following: Internet gateway LAN 192.168.25.1/24 VPN Gateway LAN 10.45.99.2/24 (VPN tunnel 10.45.99.1 to net 87.115.17.40/29, separate connection to Internet) Linux VPN Router eth0 192.168.25.71/24 eth0:503 10.45.99.1/24 Default 192.168.25.1 route to 87.115.17.40/29 via 10.45.99.2 (send_redirects disabled, ip_forward enabled) Linux clients (multiple): eth0 192.168.25.x/24 Default 192.168.25.1 route to 87.115.17.40/29 via 192.168.25.71 Ping to the machines via tunnel from the VPN Router is working. Now I want to establish a routing from my clients over the VPN gateway and the client packet gets routed to 192.168.25.1 ! traceroute output shows the packets get routed to 192.168.25.71, but then to 192.168.25.1. So the route is not respected in forward ! IPTables and Routing: ip route show 87.115.17.40/29 via 10.45.99.2 dev eth0 10.45.99.0/24 dev eth0 proto kernel scope link src 10.45.99.1 192.168.25.0/24 dev eth0 proto kernel scope link src 192.168.25.71 default via 192.168.25.1 dev eth0 iptables -A INPUT -i eth0:503 -j REJECT iptables -t nat -A POSTROUTING -o eth0:503 -j MASQUERADE iptables -A FORWARD -i eth0:503 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 192.168.25.0/24 -o eth0:503 -j ACCEPT So what is wrong with my setup ? The route is chosen correctly from localhost, but all the clients get forwarded to the Internet GW. thanks for helping, Marcus

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• Mounting any Windows share from OS X 10.7.5 suddenly stopped working

  - by user2169619

  I have problem with mounting Windows network shares from my OS X 10.7.5 - it worked but it stopped and nothing helps and nothing in logs. Here what I get when trying to mount it manually: mount -t smbfs //10.0.0.7/d /tmp/test When doing sniffing with tshark - no packet it sent through and I get immediately return from the command: mount_smbfs: server connection failed: Unknown error: -1 Nothing in /var/log/syslog.log and /var/log/kern.log. The Finder does not work either - it throws an error that something is wrong (in czech thus I'm not sending the message here). I just cannot connect to any network shares. In virtual Windows 7 in Parallels Desktop I can connect successfully, but not within the network share (so the Win7 is behind OS X NAT) but only with its own IP address. The Windows server share is on the same network segment connected through switch. Any advice how to debug and what can be wrong? I spent hours to find solution on Google and here but no-one with this kind of problem and I do not know how to further debug it since there is no meaningful log / trace etc. I can ping 10.0.0.7 and I can connect to FTP server on 10.0.0.7 - the Windows machine (XP) has firewall completely turned off. The problem is that with tshark, I'm not seeing any packet sending to 10.0.0.7 so it's not even trying to reach the server.

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• linux container bridge filters ARP reply

  - by Dani Camps

  I am using kernel 3.0, and I have configured a linux container that is bridged to a tap interface in my host computer. This is the bridge configuration: :~$ brctl show bridge-1 bridge name bridge id STP enabled interfaces bridge-1 8000.9249c78a510b no ns3-mesh-tap-1 vethjUErij My problem is that this bridge is dropping ARP replies that come from the ns3-mesh-tap-1 interface. Instead, if I statically populate the ARP tables and ping directly everything works, so it has to be something related to ARP. I have read about similar problems in related posts, and I have tried with the solutions explained therein but nothing seems to work. Specifically: ~$ grep net.bridge /etc/sysctl.conf net.bridge.bridge-nf-call-arptables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-filter-vlan-tagged = 0 net.bridge.bridge-nf-filter-pppoe-tagged = 0 arptables and ebtables are not installed. iptables FORWARD is all set to accept: Chain FORWARD (policy ACCEPT) target prot opt source destination The bridged interfaces are set to PROMISC: ~$ ifconfig ns3-mesh-tap-1 Link encap:Ethernet HWaddr 1a:c7:24:ef:36:1a ... UP BROADCAST PROMISC MULTICAST MTU:1500 Metric:1 vethjUErij Link encap:Ethernet HWaddr aa:b0:d1:3b:9a:0a .... UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 The macs learned by the bridge are correct (checked with brctl showmacs). Any insight on what I am doing wrong would be greatly appreciated. Best Regards Daniel

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• Why can't I connect to my router's config page with Windows 7?

  - by user17940

  I've got a Belkin wireless router, and just bought a new Dell computer with Windows 7 pre-installed. I can connect to the Internet and my home network just fine, but when I try to visit my router's configuration page at http://192.168.2.1, I get a "Connection was reset" error. Nothing I do will make the router's configuration page come up in my web browser. More background information: I could always get to the router's config page from my Windows XP machine. I never had any trouble prior to getting this Windows 7 computer. I can ping 192.168.2.1 successfully from my Windows 7 computer. My PC is connected to the router by a physical CAT5 cable, not via wireless. Every device connected to my router, including the new computer, can get to the Internet with no problem. Here are some things that did not solve the problem: I tried turning off IPV6 in Windows. I tried turning off my firewall and antivirus software I tried using https instead of http I tried disabling and then enabling the network connection in Windows I tried reverting my network card driver back to an older version I have tried both Firefox and Internet Explorer web browsers. Has anyone experienced something like this before, and solved it? Thanks a lot for your help!

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• How do I access my samba drive through several layers of network topology?

  - by stephenmm

  I have a new windows 7 Home Premium machine that is in a different room than my main computer area. As such I have to use a bridge and another router. Everything is working wonderfully except I cannot access the SAMBA drive with the new machine. I know that SAMBA is accessible as an older WinXP machine can access it. A picture of my network would probably be helpfull: To ISP | | +---------------------------+ | WAN | | Cable Modem | | (2WIRE678) | | | | | +---------------------------+ | +---------------------------+ | | (|) (|) +-----------+ | Belkin Router | | | | Wireless | | (F5D) |--+ +--| WinXP | | | |SAMBA USER | | | +-----------+ +---------------------------+ | | | | +------------+ | | Ubuntu | | | Apache + | | |SAMBA Server| | +------------+ | | +---------------------------+ | | | Netgear Bridge | | (XET1001) | | | +---------------------------+ # # +---------------------------+ | | | Netgear Bridge | | (XET1001) | | | +---------------------------+ | +---------------------------+ | | | D-Link Router | | (DI-524) | | | | | +---------------------------+ | | | | +-----------+ | | | Win7 | |SAMBA USER?| +-----------+ More interesting data points: 1. I can ping the SAMBA server from the Win7 machine locally (Ie. 192.168.2.2) 2. I can access the webserver from the Win7 machine locally (Ie. 192.168.2.2) 3. I followed the advice to get Win7 and SAMBA to play nice: http://www.tannerwilliamson.com/2009/09/windows-7-seven-network-file-sharing-fix-samba-smb/ Sorry for being so long winded but it is kind of complex and I am really at a loss as to how to fix it. If any of you have some suggestions I would love to hear it!

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• Should I expect ICMP transit traffic to show up when using debug ip packet with a mask on a Cisco IOS router?

  - by David Bullock

  So I am trying to trace an ICMP conversation between 192.168.100.230/32 an EZVPN interface (Virtual-Access 3) and 192.168.100.20 on BVI4. # sh ip access-lists 199 10 permit icmp 192.168.100.0 0.0.0.255 host 192.168.100.20 20 permit icmp host 192.168.100.20 192.168.100.0 0.0.0.255 # sh debug Generic IP: IP packet debugging is on for access list 199 # sh ip route | incl 192.168.100 192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.100.0/24 is directly connected, BVI4 S 192.168.100.230/32 [1/0] via x.x.x.x, Virtual-Access3 # sh log | inc Buff Buffer logging: level debugging, 2145 messages logged, xml disabled, Log Buffer (16384 bytes): OK, so from my EZVPN client with IP address 192.168.100.230, I ping 192.168.100.20. I know the packet reaches the router across the VPN tunnel, because: policy exists on zp vpn-to-in Zone-pair: vpn-to-in Service-policy inspect : acl-based-policy Class-map: desired-traffic (match-all) Match: access-group name my-acl Inspect Number of Half-open Sessions = 1 Half-open Sessions Session 84DB9D60 (192.168.100.230:8)=>(192.168.100.20:0) icmp SIS_OPENING Created 00:00:05, Last heard 00:00:00 ECHO request Bytes sent (initiator:responder) [64:0] Class-map: class-default (match-any) Match: any Drop 176 packets, 12961 bytes But I get no debug log, and the debugging ACL hasn't matched: # sh log | inc IP: # # sh ip access-lists 198 Extended IP access list 198 10 permit icmp 192.168.100.0 0.0.0.255 host 192.168.100.20 20 permit icmp host 192.168.100.20 192.168.100.0 0.0.0.255 Am I going crazy, or should I not expect to see this debug log? Thanks!

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• error: unexplained error (code 130) at rsync.c(541) [sender=3.0.7]

  - by brazorf

  This error: unexplained error (code 130) at rsync.c(541) [sender=3.0.7] error is happening after i changed router. Actually, i found out that this error just happens on a ctrl+c signal, so it could be not representative about the error itself. The command i run is very basic: rsync -avz --delete /local/path/ username@host:/path/to/remote/directory Basically, the rsync just stuck there and nothing's happening, until i ctrl+c. After interrupting the process i got the error in subject. I past the whole thing here: rsync -avvvvz --delete /source/path/ username@host:/path/to/direectory cmd=<NULL> machine=HOSTNAME user=username path=/path/to/direectory cmd[0]=ssh cmd[1]=-l cmd[2]=username cmd[3]=HOSTNAME cmd[4]=rsync cmd[5]=--server cmd[6]=-vvvvlogDtprze.iLsf cmd[7]=--delete cmd[8]=. cmd[9]=/path/to/direectory opening connection using: ssh -l username HOSTNAME rsync --server -vvvvlogDtprze.iLsf --delete . /path/to/direectory note: iconv_open("UTF-8", "UTF-8") succeeded. ^C[sender] _exit_cleanup(code=20, file=rsync.c, line=541): entered rsync error: unexplained error (code 130) at rsync.c(541) [sender=3.0.7] [sender] _exit_cleanup(code=20, file=rsync.c, line=541): about to call exit(130) The authentication runs on ssh via rsa key. I tried basic troubleshoot such as: ping the remote host ssh -l username remote.host check software firewall logs i asked the remote host sysadmin to check for logs, and when i run that command a ssh connection is actually being established and i can state there is no comunication/authentication/name resolution issue here. Rolling back to old router make this work again. Both client and server are running ubuntu 10.04. Try to take a look at my router configuration, where i'm no experienced at all, but i didnt see any "suspect" (what i was looking for is firewall blocking something) setting. The router itself is DLINK DVA-G3670B. Any suggestion? Thank You F.

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• IP routing Solaris 9 access the internet from local network

  - by help_me

  I am trying to configure the NICS on the Solaris Sparc server. My problem lies in getting out to the "Internet" from the local network. I have requested the NIC to receive a DHCP server address #ifconfig -interface dhcp start. If anyone could guide me as to what I need to do next. I am not able to ping 4.2.2.2 or access the internet. Much appreciated, thank you #uname -a SunOS dev 5.9 Generic_122300-59 sun4u sparc SUNW,Sun-Fire-V210 ifconfig -a lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1 inet 127.0.0.1 netmask ff000000 bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2 inet 10.100.0.3 netmask ffffc000 broadcast 10.100.63.255 bge0:2: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2 inet 10.100.0.22 netmask ffffc000 broadcast 10.100.63.255 bge3: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 12 inet 169.14.60.37 netmask fffffe00 broadcast 169.14.61.255 cat /etc/defaultrouter 10.100.0.254 169.14.60.1 cat /etc/resolv.conf nameserver 169.14.96.73 nameserver 169.10.8.4 netstat -rn Routing Table: IPv4 Destination Gateway Flags Ref Use Interface -------------------- -------------------- ----- ----- ------ --------- 169.14.60.37 169.14.60.1 UGH 1 0 169.14.60.0 169.14.60.37 U 1 18 bge3 10.100.0.0 10.100.0.3 U 1 34940 bge0 10.100.0.0 10.100.0.22 U 1 0 bge0:2 224.0.0.0 10.100.0.3 U 1 0 bge0 default 10.100.0.254 UG 1 111 default 169.14.60.1 UG 1 26 127.0.0.1 127.0.0.1 UH 10 59464 lo0 bash-2.05$ sudo ndd -get /dev/ip bge0:ip_forwarding 1 bash-2.05$ sudo ndd -get /dev/ip bge3:ip_forwarding 1 bash-2.05$ sudo ndd -get /dev/ip ip_forwarding 1

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• Server 2003 and XP Client; Why are HTTP connections being silently dropped.

  - by Asa Yeamans

  On my network, my edge-router, a windows 2003 r2 server router with all the latest updates, will drop packets, but only under specific circumstances. I have troubleshot and isolated it down to the most simple configuration i can. There is NO NAT involved. Only fully-public IP addresses. No Firewalls are running either, all ahve been disabled. no packet filters on any interfaces anywhere either. I have a single Windows XP virtual machine and my edge-router(the windows 2003 r2 server, and also a virtual machine) running on a windows 2008 x64 r2 system (running virtual server 2005 as i dont have Intel-VT compatible chip yet). The edge router can access any external http site just fine, no issues. However the windows XP machine is only able to access certain sites. These work: www.google.com www.txstate.edu www.workintexas.com www.thedailywtf.com . These Dont: www.yahoo.com www.utexas.edu en.wikipedia.org slashdot.org www.bing.com. I have removed all possibility of DNS issues by connecting with net-cat from the XP box and sending GET /\r\nHost: \r\n\r\n and that connection replicates the issue as well. The network setup: My statically assigned IP block: x.x.x.168/29 DSL Modem -----PPPoE Connection---- x.x.x.169[EdgeRouter] [EdgeRouter]x.x.x.170 -----Virtual Ethernet----- x.x.x.174 [Test2] Test2's Default gateway is x.x.x.170 and test2 can ping any and every valid, accessible, public IP address with no packet loss what-so-ever. If i connect directly over PPPoE from test2 (the XP box) everything works just fine... Im at my wits end, i have NO IDEA whats causing this.

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• Setting up vsftpd, hangs on list command

  - by Victor

  I installed vsftpd and configured it. When I try to connect to the ftp server using Transmit, it manages to connect but hangs on Listing "/" Then, I get a message stating: Could not retrieve file listing for “/”. Control connection timed out. Does it have anything to do with my iptables? My rules are as listed: *filter # Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accepts all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allows all outbound traffic # You can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allows HTTP and HTTPS connections from anywhere (the normal ports for websites) -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT # Allows SSH connections # # THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE # -A INPUT -p tcp -m state --state NEW --dport 30000 -j ACCEPT # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT

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• cannot connect to vpn server (error 721)

  - by callmeblessed

  Hi I got 2 internet connections in my computer. One is using 3.5G HSDPA modem (vodafone huawei e220) and the other using mobile phone (cdma zte c261). Both are using different ISP and i have both. at the moment, i can connect to my office vpn using the HSDPA modem one. But when i tried to use cdma modem (dial up - mobile phone modem), i am just able to get "verifying username and password" and then after a few minutes it display error : Error 721 The Remote Computer didn't respond. I tried to ping into my office ip address, it got good result but still cannot connect to the vpn. I tried to turn off all my firewall (i'm using commodo) and has no response as well. In my cdma mobile phone modem Network connections I tried to allow iNternet connection sharing as well ... and turn on all Internet Protocol TCP/IP, File & Printer Sharing & Client for microsoft networks. But all of my effort has no effect. How to fix this problem ? note: my office using windows vpn as well. thank you .

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• Connect by Wifi to Sql Server from another computer

  - by Bronzato

  I try to connect by Wifi to Sql Server with Sql Server Management Studio from another computer but it failed. I have a computer with Windows Seven & Sql Server 2008 (lets say the server computer). Next to it, I have a fresh installed computer with Windows Seven & Sql Server Management Studio (let's say the client computer). What I do on the server computer: configure firewall by enabling port 1433 enabled network protocols (TCP/IP) inside Sql Server Configuration Manager checked "Allow remote connections to this server" on server properties in Sql Server Management. started Sql Server Browser restarted services (Sql Server Browser is stopped but I think it is not neccessary, isn't it?) Next, I successfully tested a ping on the port 1433 from my client computer with a tool named tcping (ex: tcping 192.168.1.4 1433). But I still cannot connect from my client computer to Sql Server on my other computer. Ok, something new on this problem: until now, I successfully connected to my "server computer" with Management Studio. What I do is typing the computer name in the server name field in the connection window of Management Studio. My previous (failed) attempt was to type the computer name followed by the instance of sql server (ex: COMPUTER_NAME\SQL2008). I don't know why I only have to type the computer name... Nevermind. Now my new challenge is to succeed connecting my VB6 application to this remote database located on my "computer server". I have a connection string for this but it failed to connect. Here is my connection string: "Provider=SQLOLEDB.1;Password=mypassword;User ID=sa;Initial Catalog=TPB;Data Source=THIERRY-HP\SQL2008" Any idea what's wrong? Thanks

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• Can't route specific subnet thru VPN in ubuntu

  - by Disco

  I'm having issues routing traffic thru VPN. Here's my setup I have 3 hosts, let's call them A, B and Z B and Z have a VPN connection in the 10.10.10.x SUBNET A and B have a direct connection in the 10.10.12.x SUBNET I want to be able to route traffic from A to Z, like : A <= 10.10.12.254 [LAN] 10.10.12.111 => B <= 10.10.10.152 [VPN] 10.10.10.10 => Z On host B, i have set up ip_forwarding : net.ipv4.ip_forward = 1 and routing on host B: [root@hostA: ~]# ip route 10.10.10.10 dev ppp0 proto kernel scope link src 10.10.10.152 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.111 10.10.10.0/24 dev ppp0 scope link 169.254.0.0/16 dev eth1 scope link routing on host A: [root@hostA: ~]# ip route 10.10.10.0 via 10.10.12.111 dev eth1 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.254 169.254.0.0/16 dev eth1 scope link default via 192.168.1.1 dev eth0 But still not able to ping 10.10.10.10 from host A. Any idea ? I'm pulling my hairs out.

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• Emails not sending from outlook / OWA - Not even hitting the mail queue in exchange

  - by webnoob

  We are having an issue this morning where we can receive external emails but cannot send internal or external ones from Outlook or OWA. If I use: Send-MailMessage –From <[email protected]> –To <[email protected]> –Subject “Test #01”-Body “Just a test message.” –SMTPServer <Server-Name> –Credential <domain\user> the email is sent correctly which makes me think there is a connection issue with OWA and Outlook. However, outlook is reporting as Connected with exchange. I have checked the message tracking in exchange tools and emails sent via outlook and OWA do not appear. Nothing has changed on the server on the weekend so I don't really know where to start debugging this issue. We are using Windows SBS 2011. We only have one send connector which isn't using Smart Hosts and is set to use DNS MX records. Use external DNS is not checked and I can ping google.com etc so doesn't appear to be a DNS issue (plus the email sends from the console anyway). EDIT It appears that users using IMAP can send emails correctly, its only ones that rely on the normal exchange connection type that don't work. EDIT Emails from IMAP are hitting the email queue's where as emails from the normal exchange accounts aren't. EDIT It seems that some of the emails we tried to send yesterday sent at about 1am but now it won't work again..

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• Manual NAT on Checkpoint (Redirect all http requests to a local web server)

  - by B. Kulakli

  We have a proxy server in our internal network and I want to redirect all internet http requests to a web server in local network. It'll be like a Network Billboard that says "No direct connection is available. Set up your proxy etc." For example: A user starts the computer Opens the browser Tries to open www.google.com Should see web server output on local network Tries another web site on internet Should see web server output on local network Sets up proxy Tries to connect to a web site Web site should be loaded I have added a simple manual NAT rule to address translation in Checkpoint firewall but it simply does not work. Here is my address translation rule Source Destination Service T.Source T.Destination T.Service MY_PC A_GOOGLE_IP ALL ORIGINAL INT_WEB_SRV ORIGINAL Then when I ping A_GOOGLE_IP, replies come from INT_WEB_SRV, as I expected. However, when I try to connect A_GOOGLE_IP from browser (http://A_GOOGLE_IP), no replies come from SYN_SENT and falls into timeout. When I look at the firewall log of INT_WEB_SRV, I can see the incoming connection requests from MY_PC is accepted and NO denies. By the way, there is no problem to see INT_WEB_SRV (http://INT_WEB_SRV) from browser. My understanding is, my NAT rule at checkpoint NGX R60 does not include return packets. I definitely need some help.

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• webmin's bind & nameserver - NS doesn't resolve

  - by user127518

  Got a problem setting up a nameserver. Here are the details: domain http://stagingtestserver.com.au/ (I did some updates and now www.stagingtestserver.com.au won't resolve) I got some errors in www.intodns.com/stagingtestserver.com.au as well. I could not ping ns1. and ns2. also. This is the record file under /var/named/stagingtestserver.com.au.hosts: $ttl 38400 stagingtestserver.com.au. IN SOA ns1.stagingtestserver.com.au myemail\.here.gmail.com. ( 1341370630 10800 3600 604800 38400 ) stagingtestserver.com.au. IN A 202.4.229.161 www.stagingtestserver.com.au. IN A 202.4.229.161 ftp.stagingtestserver.com.au. IN A 202.4.229.161 m.stagingtestserver.com.au. IN A 202.4.229.161 localhost.stagingtestserver.com.au. IN A 127.0.0.1 webmail.stagingtestserver.com.au. IN A 202.4.229.161 admin.stagingtestserver.com.au. IN A 202.4.229.161 mail.stagingtestserver.com.au. IN A 202.4.229.161 stagingtestserver.com.au. IN MX 5 mail.stagingtestserver.com.au. ns1.stagingtestserver.com.au. IN A 202.4.229.161 ns2.stagingtestserver.com.au. IN A 202.4.229.172 stagingtestserver.com.au. IN NS ns1.stagingtestserver.com.au. stagingtestserver.com.au. IN NS ns2.stagingtestserver.com.au. Any thoughts, guys? Thanks and I appreciate all your thoughts/help/(ahem violent) reactions? :)

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• Vlan on DD-WRT v24 filesharing without internet

  - by user148888

  I'm planning to do a vlan with shared files without internet. my vlan is working correctly until I could lock the internet but I can not share files only I can ping from 172.168.1.x to 172.168.2.x but not backward. can u help me please?? This is my config. WRT54g DD-wrt v24 vlan0 eth 1,2,3 172.168.1.1/24 vlan1 Wan vlan2 eth 4 172.168.2.1/24(don't want internet here just Lan Conection) Pc (my pc) 172.168.1.10/24 gtway 172.168.1.1 (with internet) Ubiquity Nanostation loco M2 172.168.2.20/24(AP)(connect to eth 4 vlan2)(don't want internet here) Ubiquity Nanostation loco M2 172.168.2.21/24(Client)(don't want internet here) Friend pc 172.168.2.115/24(connected from the client)(don't want internet here) Any Help Please.. ![Lan Map][1] ![Vlan Config1][2] ![Vlan Config2][3] ![Vlan Config3][4] ![Command to block internet][5] [url=http://imageshack.us/photo/my-images/194/lanxl.jpg/][img=http://imageshack.us/a/img194/4197/lanxl.th.jpg][/url] [url=http://imageshack.us/photo/my-images/600/commandmf.jpg/][img=http://imageshack.us/a/img600/9530/commandmf.th.jpg][/url] [url=http://imageshack.us/photo/my-images/811/57398524.jpg/][img=http://imageshack.us/a/img811/1917/57398524.th.jpg][/url] [url=http://imageshack.us/photo/my-images/717/48064277.jpg/][img=http://imageshack.us/a/img717/829/48064277.th.jpg][/url] [url=http://imageshack.us/photo/my-images/685/21456517.jpg/][img=http://imageshack.us/a/img685/256/21456517.th.jpg][/url]

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• Hyper-V: Dedicated NIC for Guests VMs

  - by TheLizardKing

  I have two NIC cards and created a private virtual network for my virtual machines and unchecked "Allow management operating system to share this network adapter" which basically turns my Guest NIC into this sorta shell of a NIC card on the host machine and the only thing checked in it's properties is "Microsoft Virtual Network Switch Protocol" which I am fine with. Everything works and everything is connected. My issue is that for some reason my guest (Ubuntu Server with legacy network drivers) is not talking properly to my DHCP server. Specifically my DHCP server reserves the guest's IP address using it's MAC address but the guest isn't picking it up. It's picking up any old IP it can get and I can't even ping the hostname from another PC on the network but it pings fine if I use the IP. I see the guest showing up in my DHCP table but I can't get the reservation to stick. Is there some reason it's only partially communicating with my DHCP server? Pinging it's hostname on itself reveals it's using 127.0.0.1 instead of it's network IP. Is this an issue with the legacy drivers used in Hyper-V?

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• Wireless very slow on one laptop on network, all other machines normal?

  - by th3dude19

  My new laptop (Acer Aspire Timeine 3810TZ running Windows 7 Home Premium 64bit) is acting very strange on my wireless network. Below are the issues I'm noticing... The connection frequently drops. I see the icon change from 'full bars' to 'empty bars with yellow star (meaning no connection)' occasionally. Almost every website I visit (Firefox) hangs for a long time on 'Looking up www.amazon.com' for example. After a long pause, it finally starts loading the website. Neither of these problems exist on any other machines on my network. I also have a desktop running the same OS wirelessly and it works fine. I've run several Speedtest.net tests and the speeds are great (20MBit down/4 up). Results from pingtest.net are as follows: Line quality: D Ping: 46ms Jitter: 65ms Packet Loss: 9% These results are to a server that is less than 10 miles from my residence. The results on the other machines in my house are normal. Any suggestions? This is becoming very annoying as I purchased this machine primarily for browsing.

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• Best way to troubleshoot intermittent network outages?

  - by Ben Scheirman

  We have a Comcast 50/10 line into our office. We keep seeing very short but sometimes frequent drops in our internet service. It's enough to kick you off of skype and stop any websites from loading, which is obviously affecting our productivity. We've tried 4 different routers, we've tried moving everyone off of wireless and onto wired via a switch and so far nothing has helped. Right now we're on a Cisco SB WRP400-G1 router. Attached to the router is a 16 port switch going to the ports in all of the offices. We've moved to OpenDNS in the case that it was the comcast DNS servers going down. Today we tried putting the modem, router, and switch on a UPS to make sure it wasn't power fluctuations that was causing it. Every time we call Comcast, by the time they are here the internet is working fine. I'd like to somehow prove that the problem is with Comcast, so if that means plugging in a machine directly into their router and collecting data all day, I'm up for that. I just want to hear ideas on what tools to run and how to collect this data. I could just continuously ping google.com all day long but I'm not sure how valuable that data would be. Thoughts?

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• Internet Explorer not working after establishing a SSTP VPN connection

  - by Massimo

  I have a problem which is constantly appearing on each Windows 7 computer I'm using, whenever I establish a SSTP VPN connection to a ForeFront TMG 2010 firewall; it only happens with SSTP connections, not PPTP/L2TP ones. The problem appears only if using a proxy server for Internet access; it doesn't happen when directly accessing the Internet (with or without NAT). It doesn't seem to depend on a specific proxy software being used (I've seen it happening with various ones). The problem is: as soon as I start the VPN connection, Internet Explorer can't access anything anymore. I'm not using the VPN connection as a default gateway, and I can succesfully ping the proxy server after the VPN connection is esatablished (and even telnet to its 8080 TCP port), so this is definitely not a routing problem. Also, the problem is specifically related to Internet Explorer: while it seems not able to connect to any site, other programs (such as FireFox) have no problem accessing the Internet through the same proxy. This behaviour can be easily reproduced on any Windows 7 computer (the service pack and patch level doesn't seem to matter at all). Have IE connect through a proxy, establish a SSTP VPN connection... and IE will just not work anymore until the VPN connection is dropped.

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• Git clone/pull across local network

  - by Tom Sarduy

  I'm trying to clone/pull a repository in another PC using Ubuntu Quantal. I have done this on Windows before but I don't know what is the problem on ubuntu. I tried these: git clone file:////pc-name/repo/repository.git git clone file:////192.168.100.18/repo/repository.git git clone file:////user:pass@pc-name/repo/repository.git git clone smb://c-pc/repo/repository.git git clone //192.168.100.18/repo/repository.git Always I got: Cloning into 'intranet'... fatal: '//c-pc/repo/repository.git' does not appear to be a git repository fatal: The remote end hung up unexpectedly or fatal: repository '//192.168.100.18/repo/repository.git' does not exist More: The other PC has username and password Is not networking issue, I can access and ping it. I just installed git doing apt-get install git (dependencies installed) I'm running git from the terminal (I'm not using git-shell) What is causing this and how to fix this? Any help would be great! UPDATE I have cloned the repo on Windows using git clone //192.168.100.18/repo/intranet.git without problems. So, the repo is accessible and exist! Maybe the problem is due user credentials?

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• VCL - configuration for Magento and Varnish 3.0.2

  - by Tomas

  I would like to kindly ask if there's someone who can help me configure Varnish for Magento to reach far more hits. My current ratio from varnishstat is: cache_hit=271 cache_miss=926 I'm kindly asking this because I've googled almost every site related to this theme, but 99.9% of configurations don't work because of outdated code. Details of my set-up: I use Varnish on port 80, Apache on port 81, PageCache as Magento varnish module, APC for PHP speed and Memcached for dynamic caching. Load speed is about 1.5s on home-page (Pingdom.com average results) USA ping & 2.5s Europe. Servers are located in Toronto, Canada. EDIT: This is my full VCL configuration http://pastebin.com/885BzHCs (I just use xxx.xxx.xxx.xxx for my IPs) This is the info from the command (varnishtop -i TxHeader -I Cookie): TxHeader Cookie: frontend=965b5...(*lots of numbers); adminhtml=3ae65...(*lots of numbers); EXTERNAL_NO_CACHE=1 "(*lots of numbers)" is just my adding to the info Any idea how to avoid Varnish hitting this cookies? (If I got correctly the idea about avoiding Vanrish hitting the cookie and not caching the home page). Thank you for any help!

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