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• Ping "replies" from same computer with 'Destination host unreachable' (no route to other computer)

  - by Srekel

  I've got two computers in a LAN behind a wireless router. One has XP with ip 192.168.1.2 This one has W7 with ip 192.168.1.7 If I try to ping the other one from this computer, I get this: C:\Users\Srekel>ping 192.168.1.2 Pinging 192.168.1.2 with 32 bytes of data: Reply from 192.168.1.7: Destination host unreachable. Reply from 192.168.1.7: Destination host unreachable. Reply from 192.168.1.7: Destination host unreachable. Reply from 192.168.1.7: Destination host unreachable. Ping statistics for 192.168.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Tracert gives the same result: C:\Users\Srekel>tracert 192.168.1.2 Tracing route to 192.168.1.2 over a maximum of 30 hops 1 Kakburken4 [192.168.1.7] reports: Destination host unreachable. Trace complete. Although I can ping and tracert the router without any problems. I have disabled the firewalls on both computers. The router is set to use DHCP (if that matters). Here is the output from "route". C:\Users\Srekel>route print =========================================================================== Interface List 13...00 25 86 df c6 89 ......TP-LINK Wireless N Adapter 12...e0 cb 4e 26 b9 84 ......Realtek PCIe GBE Family Controller #2 11...e0 cb 4e 26 be 94 ......Realtek PCIe GBE Family Controller 1...........................Software Loopback Interface 1 16...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 14...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.7 20 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.1.0 255.255.255.0 On-link 192.168.1.7 276 192.168.1.7 255.255.255.255 On-link 192.168.1.7 276 192.168.1.255 255.255.255.255 On-link 192.168.1.7 276 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.1.7 276 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.1.7 276 =========================================================================== Persistent Routes: None IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 14 58 ::/0 On-link 1 306 ::1/128 On-link 14 58 2001::/32 On-link 14 306 2001:0:5ef5:73ba:881:20c1:3f57:fef8/128 On-link 14 306 fe80::/64 On-link 14 306 fe80::881:20c1:3f57:fef8/128 On-link 1 306 ff00::/8 On-link 14 306 ff00::/8 On-link =========================================================================== Persistent Routes: None I've set up and debugged a few networks in my life but I'm not really an advanced network user, so I'm not sure what might be wrong. Any ideas? Oh, and pinging this computer from the other computer doesn't work either.

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• PPTP Client setup, Fedora 17

  - by Suarez Romina

  I am trying to connect to hidemyass.com VPN services via PPTP, but I am having issues understanding why it isn't working, since I don't get a warning or fatal error and my IP remains the same. This is how i create the connection: [root@lasvegas-nv-datacenter ~]# pptpsetup --create TUNNELNAME --server 199.58.165.20 --username MYUSERNAME --password MYPASSWORD --encrypt --start And this is the output: Using interface ppp0 Connect: ppp0 <-- /dev/pts/1 CHAP authentication succeeded MPPE 128-bit stateless compression enabled local IP address 10.200.21.14 remote IP address 10.200.20.1 After that, I check the log and this is what i get: [root@lasvegas-nv-datacenter ~]# tail -f /var/log/messages Aug 24 11:25:33 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_rep:pptp_ctrl.c:254]: Sent control packet type is 1 'Start-Control-Connection-Request' Aug 24 11:25:33 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_disp:pptp_ctrl.c:754]: Received Start Control Connection Reply Aug 24 11:25:33 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_disp:pptp_ctrl.c:788]: Client connection established. Aug 24 11:25:34 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_rep:pptp_ctrl.c:254]: Sent control packet type is 7 'Outgoing-Call-Request' Aug 24 11:25:34 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_disp:pptp_ctrl.c:873]: Received Outgoing Call Reply. Aug 24 11:25:34 lasvegas-nv-datacenter pptp[3892]: anon log[ctrlp_disp:pptp_ctrl.c:912]: Outgoing call established (call ID 0, peer's call ID 20096). Aug 24 11:25:38 lasvegas-nv-datacenter pppd[3884]: CHAP authentication succeeded Aug 24 11:25:38 lasvegas-nv-datacenter pppd[3884]: MPPE 128-bit stateless compression enabled Aug 24 11:25:38 lasvegas-nv-datacenter pppd[3884]: local IP address 10.200.21.14 Aug 24 11:25:38 lasvegas-nv-datacenter pppd[3884]: remote IP address 10.200.20.1 Can someone help me? Basically, i Ieed to connect to the VPN and have my IP changed after the connection. I read a lot of guides but still cannot understand why I don't get a connection.

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• Server 2008 print server down / access denied

  - by johnnyb10

  I have two Server 2008 servers (both running as VMs in VMware). One is a Full Installation, and the other is a Server Core installation. I just installed Print Services on both of them. In Print Management on the Full server, I added the Server Core print server (so now two print servers are listed in Print Management). However, the icon for my Server Core print server has a red, down-pointing arrow (indicating that it is down, I suppose). And when I right-click it and click Add Printer, I get a message saying that access is denied. Can someone tell me how to bring up or check on the status of the Server Core print server. Obviously, I'm somewhat of a noob with this stuff. Thanks in advance...

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• Automatically repair network connection when it goes down.

  - by Spines

  Every hour or so my wireless router goes down, and everyone connected loses internet for a couple minutes. If I right click on my network connection and choose repair, I usually get internet back quicker. Is there a way I can automatically have it try to repair the connection once it goes down? Can I write a program to do this if there isn't a built in windows setting? BTW I'm using Windows XP. EDIT:My router is a Linksys WRT110 with Firmware Version: 1.0.04, and I have cable internet. The signal is 100%. I live in an apartment complex and there are about 15 other wifi networks visible to me, not sure if that has any effect.

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• Setup Linksys 3200 remote access

  - by Greg

  I'm trying to setup remote access for my linksys 3200 so that I can configure it through the WAN port. I have turned on remote access, however when I try to connect I get a 404 error. The settings I have are: When I try to access xxx.xxx.xxx.xxx:9999 I just get a 404 error. I have allowed RDP access to a computer behind the router and this works fine on the same IP address. Any idea's on what else I have to do to allow remote management access? UPDATE: I tried changing the port to 80 and it works. Change it back to any other number and it doesn't work. Modem is setup with a DMZ to the router's IP. Why does it only work on port 80? BTW I can't use port 80 because there is a website hosted behind the router.

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• Multi-Boot through IPMI possible?

  - by yoursort

  Hi, I want to setup a cluster. On each machine Windows XP and Linux should be installed and the OS should be selectable by a boat loader (e.g. grub). All machines have IPMI cards. Is it possible when starting the machines over IPMI to also select the OS to boot? And how? Thanks!

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• Clickonce applications being allowed through firewall

  - by DanielF

  The company I work for uses an application that is deployed through clickonce. This means that everytime they update said program the program regenerates in a new location ie: C:\Users\%username%\AppData\Local\Apps\2.0\89XCT43D.10T\WBZ8WE7L.927\trm8..tion_1ad39bb503bcb5df_0008.0005_14829906c9aa8611\%appname%.exe Recently the computers were updated to windows 7 machines and now everytime an update is pushed out the windows firewall see this as a new application and prompts the users to allow the program through the firewall. THis means I have to walk around to every computer and type in admin credentials. Does anyone know of a way to allow the application regardless of the path it is in? Google has not been very helpful so far.

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• Fritz!Box IPv6-Address different than IPv6-Prefix

  - by kmindi

  In my Fritzbox it states the following: IPv6-Adresse: 2a02:8070:600::14b6:c7******, Gültigkeit: 100465/86065s IPv6-Präfix: 2a02:8070:62c:3200::/56, Gültigkeit: 100464/86064s I am not able to connect to IPv6 Addresses from computers configured by the fritzbox, because they get an address with prefix 2a02:8070:62c:3200::/56 but somehow the fritzbox does not route those addresses. Is this because the IPv6-Address is not in the prefix range? The address of the Fritzbox responds to pings, but my computers reached via various addresses from the prefix range do not (: PING 2a02:8070:62c:3200:28d****(2a02:8070:62c:3200:28d****) 32 data bytes From 2a02:8070:600:0:14b6*** icmp_seq=0 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=1 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=2 Destination unreachable: Administratively prohibited From 2a02:8070:600:0:14b6*** icmp_seq=3 Destination unreachable: Administratively prohibited blocked ping this is "view" from outside From inside the ping6 looks like this: traceroute -6 heise.de traceroute to heise.de (2a02:2e0:3fe:100::8), 30 hops max, 80 byte packets 1 fritz.box (2a02:8070:62c:3200:****) 0.787 ms 1.424 ms 1.702 ms 2 * * * ...... 30 * * *

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• Zabbix Server with Multiple NIC (one on different VLAN) - Monitor a host from both NIC?

  - by Joshua Enfield

  Basically we have many of servers configured for internal use only. I want to ensure the internal services are preserved as internal by checking a host using the local subnet (allowed - this checks if services are up and working), and that the internal services are indeed internal (make sure the services are "down" when checking from different subnet (vlan)) Is there an easy way to do this in Zabbix?

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• ifcfg-eth* on CentOS 6.x, but for IPv6 only?

  - by Ray Hoffman

  Could someone kindly provide a skeleton ifcfg-eth0:[X] for creating an alias with a IPv6 address and no IPv4 address? Or, alternatively, what's the IPv6 equivalent of this: in /etc/sysconfig/network-scripts/ifcfg-eth0:1 DEVICE=eth0:1 ONBOOT=yes BOOTPROTO=static IPADDR=42.69.66.66 NETMASK=255.255.255.0 Or does this not even make sense in IPv6 space? I know that I can use, for example: IPV6INIT=yes IPV6ADDR=2600:4200::6900:6666:dead:beef But then do I need to specify that there is no IPv4 address associated with this alias? If so, how? And do I need to also specify the IPV6_DEFAULTGW? Or can it piggyback on the eth0 (unaliased) gateway, which is specifed, like with IPv4 aliases? EDIT: Answered my own question! The easiest way to accomplish this seems to be not to create an alias as with IPV4, but to specify, for example, IPV6ADDR_SECONDARIES=2600:4200::6900:6666:dead:beef on the script for the base interface, e.g. ifcfg-eth0.

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• Why did MAC-Adress Cloning Fix My Router?

  - by FranticPedantic

  I have a Belkin router, and about a year ago, I suddenly lost my internet connectivity from Comcast. The internet worked fine when I plugged it right into my laptop, so I just ignored it. When I moved to another apartmnet I eventually took the dive and called tech support. The tech told me to clone my MAC address which completely fixed the issue. Now I know what a MAC address is and I've read what MAC cloning is. What has bothered me since is that I don't see how this fixed the issue. As I have understood MAC address cloning, it has the router pretend it has the same MAC address as my computer. Here is why I don't understand why this fixes my issue: I have used several different computers with this router. Cloning the MAC address fixed it for ALL of my computers. The laptop I first used with my ISP was not the one that I eventually had connected when I cloned the address. Furthermore, I didn't have any problems for quite some time after I stopped using the first computer. It wasn't like the internet suddenly stopped working when I changed which laptop I was using Now it occurred to me that maybe there was some sort of expiration? Except... Which MAC address did it clone? It was just an option in the router administration page. Did it just pick whichever computer was connected to it? If my ISP still wanted the MAC of my first computer, how did some other computer's fix it? As mentioned earlier, why did this problem seemingly stem from nowhere? Anyway, I don't have any current problems so this is more just out of general curiosity. If anybody can explain it, it would be appreciated!

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• How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• Static IPv6 address advertising and IPv6 autoconfig in Debian/Ubuntu

  - by Pascal

  I have a network that advertises IPv6 addresses through IPv6 autoconfig. To allow DNS lookups and to have fancy IP addresses, we setup "static" IPv6 addresses through /etc/network/interfaces: auto eth0 iface eth0 inet dhcp iface eth0 inet6 static address a:b:c:d:e::f netmask 64 Whenever we now connect through IPv6 Linux uses the IPv6 autoconfig address: a:b:c:d:21d:60ff:fe4a:479 and not the static IPv6 address: a:b:c:d:e::f A server on the other side only sees the autoconfig address. Is there a way to force linux (Debian/Ubuntu) to use the static address for outgoing packets? This is especially interesting for reverse DNS and firewall settings. I don't want to disable the IPv6 autoconfig since I don't have control over the settings the router advertises.

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• Help with router and spotty wireless...

  - by Moshe

  Time Warner Cable/ Road Runner router shows up some times on the network list on Mac OS X 10.6.3 Snow Leopard. It makes a spotty appearence on the list. The router is a SMC Networks Model # SMC8014WG-SI. The default gateway numbers all do not work. 192.168.0.1 192.168.1.1 192.168.2.1 10.10.10.1 What IP adress am I looking for here to log in to the router to fix the issue?

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• Setting reply priority on Wifi network with QoS?

  - by Omega

  When using a Station and Access Point that support QoS over Wifi, is it possible to set the priority (= Traffic Identifier = TID = QoS channel) of the reply? For example when sending a ICMP ping request using a high priority (= QoS channel), is it possible to force the station to use that same priority (= QoS channel) when sending the reply? A related question: Is it possible to force the station into using a different QoS channel?

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• Setting reply priority on Wifi network with QoS?

  - by Omega

  When using a Station and Access Point that support QoS over Wifi, is it possible to set the priority (= Traffic Identifier = TID = QoS channel) of the reply? For example when sending a ICMP ping request using a high priority (= QoS channel), is it possible to force the station to use that same priority (= QoS channel) when sending the reply? A related question: Is it possible to force the station into using a different QoS channel?

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• Router behind router network setup

  - by optimus

  My relative has bought a router instead of a switch which causes remote-access control issues on his network. His existing network has a 1st router where all PCs are connected via LAN cables. The 2nd router connnects to the 1st router and the remaining PCs are connected to the 2nd router via LAN cables. Normally, I would perform remote-access to help him out with some task. Now it seems all services behind the 2nd router are unavailable to me. How can I resolve this issue?

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• How to set Virtualbox appliance as webdev portable sollution?

  - by tenshimsm

  I just want to set a a Virtualbox virtual appliance to make it portable. Meaning that I'll enable a network config which will not need to be changed when I am using my laptop in a different network. I want the virtual machine to have internet access to keep it updated and be able to always have direct access from host using, for example, the IP 10.0.2.100 even when I am in a 192.168.0.1 network. So the first virtual network adapter will have a static ip (10.0.2.100) and the second will receive it from the DHCP. I don't know if 2 virtual adapters are needed or just one to accomplish that.

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• Solaris 10 invalid ARP requests from 0.0.0.0?

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). xxxx:xxxx:xxxx/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else?

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• connect two ESX hosts on private LAN

  - by maruti

  can a PC setup as W2K3 DC manage two ESX hosts connected to physical hub/switch? Services: DNS, DHCP, Domain distributed to host using a hub/switch. NIC2 on each host connected to switch/hub...spanning a virtual network inside each ESX host

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• Setting up a software access point on Gigabyte GN-WPKG x64

  - by Reckage

  I'm using a Gigabyte GN-WPKG card on Windows 7 64-bit and was thinking it would be good to turn it into a wireless AP (I have a wired internet connection). Connectify, which would normally be the solution, says it's not compatible. There are instructions for setting up an AP, but they seem to be for 32-bit. I found the equivalent drivers for 7 and they don't seem to do anything. Is there no SoftAP for Vista and later on a Gigabyte card?

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• ip namespace non-root shell

  - by user2730940

  I am trying to run ssh command to another ip namespace. I can do it right now, but it runs as root. I want to run it as a normal user. I want to know if there is a way to enter a non-root shell in another network namespace. I know you can use this to enter a root shell in another namespace: sudo ip netns exec <namespace> bash Alternatively, is there a way to run single commands as a non-root user? I know you can run commands as root with this: sudo ip netns exec <namespace> <command>

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• Need help connecting to NAS externally-port forwarding and DDNS newbie

  - by Joel

  Hi folks, I just picked up a synology NAS, and I'm loving it for internal use, but I want to be able to access the NAS externally-both from my iPhone (3G) and from the net. I have a Linksys WRT54G-TM router. My first question is whether I have set up the dyndns correctly. On my computer that is on my network, if I put in mydomain.dyndns.org, I am taken to a password popup and when I enter my router login and password, my router admin page opens up. On the same computer, I get the same results if I use my external IP address, and if I use my internal IP 192.168.0.1 So that is all as expected. However, when I go to my iphone and turn off wifi, and try to connect with 3g to the external IP or the dnydns domain, I just get an error "Safari could not open the page because the server stopped responding". What's up?

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• Router slowing my connection?

  - by Roberto

  I have a Linksys WRT54G and I pay for a 12Mbps connection. I've been testing my connection using speedtest.net for many days and always get 8Mbps. I called the support and they told me to bypass the router and test. I did it and got 16Mbps (much more than I pay for), so I thought "this guy just changed my speed so can he blame my router", and he blamed it. But to my surprise, everytime I bypass the router I get 16Mbps and when I use the router I get 8Mbps. Is this guy trolling me somehow (configuring the VOIP-modem-stuff to different profiles depending o the MAC address connecting to it) or is my router a POS? How can I find out? I don't know what's the thing the router connects to, it's a kind of VOIP adapter; the link is this one, but unfortunately I don't think you'll understand because it's in Portuguese. I know they can remotely connect to it, that's the origin of my conspiracy theory :) I just tested wired to the router and got 10Mbps (and still 8Mbps on wifi and 16Mbps without router) O_o I'm 5cm away from my router, so no obstacles to interfere, right? ------ UPDATE ------- It's a WRT54G V8, I'm using firmware v8.00.7 (will install 8.00.8 tomorrow, but I saw that it's only a minor fix to UPnP denial of service security vulnerability). Results: IPerf LAN-LAN: 80Mbps IPerf LAN-WLAN: 19Mbps (therefore we can ignore wireless issues/settings) I wasn't able to make the (W)LAN-WAN NAT-enabled test with IPerf, I get a connection refused error. I'm not sure if did it right: ran in server mode, configured router to forward that port to my IP and tried to connect to my internet IP that got from this site. I don't think there is a way to disable NAT using this firmware. Question: Let's suppose it's an underpowered hardware issue. Is it right to assume that custom firmwares could resolve the issue because they are possibly better implemented and would make better use of the router resources? I couldn't find any references pointing to wired performance improvements with the use of custom firmware.

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• Localhost problems on Mac OS X 10.7

  - by Maya

  Sorry for the duplicate post ( http://stackoverflow.com/questions/9720871/localhost-problems-on-mac-os-x-10-7 ), but I got the advice that this is a better place to ask my question: I want to access a mysql server remotely over ssh. So I used port forwarding to access the remote 3306 port on my localhost as 8383. The ssh connection can established successfully. But when I want to telnet onto port 8383 on localhost I get the following error: ~: telnet 127.0.0.1 8383 Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host I tried the same on a friends Laptop (also Mac OS X 10.7) and it worked fine, so it is very unlikely that the ssh connection is the problem. I assume it has something to do with my local network configuration. I turned off IPv6, just in case. My /etc/hosts looks like this: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost I would greatly appreciate any help. Please point me in the right direction if this is not the right place to ask this question.

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