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Wireless clients have no route to ethernet clients in OpenWrt router

- by superjoe30

I'm using OpenWrt Kamikaze 8.09 on a Linksys WRT54g v1.1 router. I just flashed it with default settings and got everything working, except my wireless laptop cannot ping my desktop which is wired to the router. What can I do to fix this? (My desktop can ping other desktops wired to the router) My routing table: config 'defaults' option 'syn_flood' '1' option 'input' 'ACCEPT' option 'output' 'ACCEPT' option 'forward' 'REJECT' config 'zone' option 'name' 'lan' option 'input' 'ACCEPT' option 'output' 'ACCEPT' option 'forward' 'REJECT' config 'zone' option 'name' 'wan' option 'input' 'REJECT' option 'output' 'ACCEPT' option 'forward' 'REJECT' option 'masq' '1' config 'forwarding' option 'src' 'lan' option 'dest' 'wan' option 'mtu_fix' '1' config 'redirect' option 'src' 'wan' option '_name' 'ssh' option 'proto' 'tcp' option 'src_dport' '22' option 'dest_ip' '192.168.1.100' option 'dest_port' '22' config 'redirect' option 'src' 'wan' option '_name' 'http' option 'proto' 'tcp' option 'src_dport' '8888' option 'dest_ip' '192.168.1.100' option 'dest_port' '8888'

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Linksys Router/Tomato Firmware DNS issues

- by jasonh

I've got a WRT54GS that I've loaded the current version of Tomato onto. I entered static DHCP addresses in for the devices on my network, released and renewed the address on my desktop and tried to ping another computer. All I got was The request could not find host blah. Please check the name and try again. Now, I verified that my desktop and the target machine I'm trying to ping have both received their proper static DHCP lease and that their DNS server is the IP address of my router. What am I missing?

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AWS VPN Tunnel going down without traffic

- by Asfura

I managed to setup a site-to-site VPN connection from Amazon VPC to a company's network, and after a lot of configuration it was working fine, but now i realized that the VPN tunnel is DOWN every time there's no traffic going trough for a couple minutes. The only way that i have found to generate traffic is to reach the amazon instance from the company's network and then the tunnel goes up again. I had a cronjob doing ping every minute, but i think it should have a keepalive option somewhere, or at least a log file of the tunnels to find out what's going on. Any ideas to keep the tunnel up and/or bring it up from amazon? The firewall is a Checkpoint R75.20, it only allows one tunnel at a time for the same subnet, so i cant have both tunnels active. Thank you, any questions just ask. EDIT I forgot to add, the ping keepalive was working great (maybe generating a bit of traffic, but nothing to worry about), the connection dropped because i had to restart the instance, and it that little time it dropped me.

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VPN only connects to its server!

- by Eddie

Hi guys; Previously I bought a windows 2003 VPS and enabled routing and remote access so that users can make a vpn connection. I turend the firewall off and everything was working fine. But since 2 days ago whenever I try and connect to vpn it connects to vpn without any problem and I can see the connection status however it only connects to the server I mean what I can do with this vpn is to connect to the server via remote desktop and I can ping only the server's IP, neither I can open any webpages in browsers or ping other IP addresses beside the server one! I've also rebuilt the server and configured it for routing access and vpn connection from the beginning but it doesn't work either. It seems that server fails to route the traffic properly, as i'm sure that the firewall has been turned off I can't figure out what's the reason, any idea what's going on? Thanks in advance

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DHCP Client Can't Find DHCP Server

- by leeman24

I currently have 3 machines: CentOS (router) eth1 - 18.0.168.1 eth2 - 145.165.34.1 Windows Server 2008 (server) 18.0.168.2 DHCP scope - 145.165.34.10 - 145.165.34.20 Windows 7 (client) Supposed to use DHCP I can't get my Windows 7 client to get an address from the Windows Server 2008 DHCP server. Every network interface can ping each other (ex. 18.0.168.2 can ping 18.0.168.1 & 145.165.34.1 and the other way around). My Linux machine acting as the router has default IP tables. Other than this command which may or may not be right: iptables -I INPUT -p udp -d 18.0.168.2 --dport 67:68 -j ACCEPT I have also tried it after I flushed the IP tables. I was looking at the dhcrelay command but it seems CentOS doesn't have it and I am not even sure how to use it.

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Nameserver not resolving or domain not pingable [closed]

- by Ricky

Sorry, if anyone can think of a better title please change it! I want to host my own websites from home. For testing purposes, I have a virtual machine running a trial version of Windows Server 2008 Enterprise. Note I currently run a VPS and host my own websites but due to a nice speed upgrade on our line I now want to host from home. I have several domains but I wanted to test with one, that is rickyoleary.com. Our ISP does not provide static IP addresses unless we have a business account so I've been looking at no-ip.com. I admit my networking isn't the best, hence this question but I've been bashing my head all day on this one. I created a host name, muffinbubble.no-ip.org which runs on IP: 86.148.124.15. I've setup IIS on the server with a simple test page. I've then forwarded port 80 traffic from the router and from what I can see, it's working. If I access my website (I was unable to link to this for some reason so please copy and paste this) - http://86.148.124.15/ - I see my test page. So the next step was to create my nameservers. This domain is with namecheap.com so I created my nameservers, ns1.rickyoleary.com and ns2.rickyoleary.com. Both these point to the same IP (and yes, that will be changed after testing), the same IP as above: 86.148.124.15. On the server itself I have set up DNS entries as below which I believe to be correct and added rickyoleary.com and www.rickyoleary.com in the host headers (or bindings) in IIS 7.0. If I try and look up my domain, rickyoleary.com it shows ns1.rickyoleary.com and ns2.rickyoleary.com as the nameservers. I then tried to use just-ping.com on my nameserver ns1.rickyoleary.com. I get 100% packets lost, but the correct IP address is returned (I'm guessing the router does not allow pings, but is still accessible...). I get no response when pinging rickyoleary.com. Here's the problems: I cannot ping ns1.rickyoleary.com or ns2.rickyoleary.com from a command prompt. I'm not sure if this is an issue. When I added the nameservers in Windows Server 2008 and clicked 'resolve' a message box displays stating "No such host is known". I cannot ping rickyoleary.com. rickyoleary.com is not showing my test page on my server. Now - please note, I've waited around 6 hours for propagation. From my experience, although you're told to wait 24 - 48 hours, the changes are normally pretty quick so perhaps I'm being impatient or naive to think it should all be working fine until then. I would really appreciate some help here. Thanks.

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pfSense 2.1 OpenVPN client not using tunnelled interface

- by Brian M. Hunt

I'm having some trouble getting OpenVPN working on my pfSense box. The issue is quite strange to me. When I have the OpenVPN turned on, only my router is able to connect to the Internet. From the router I can use ping, links, etc., and connections work exactly as expected - through the VPN, with the IP address assigned by my VPN provider (Proxy.sh, incidentally). However, none of the clients on the local network can connect to the Internet. I get timeouts when using ping or a web browser. I can ping my router, and the IP address of the gateway. When I switch the default gateway from the VPN to my ISP's gateway, all works exactly as expected. Here the routing table (netstat -r) when in VPN mode, and a key for it: IPv4 Destination Gateway Flags Refs Use Mtu Netif Expire 0.0.0.0/1 10.XX.X.53 UGS 0 122 1500 ovpnc1 = default 10.XX.X.53 UGS 0 235 1500 ovpnc1 8.8.8.8 10.XX.X.53 UGHS 0 82 1500 ovpnc1 10.XX.X.1/32 10.11.0.53 UGS 0 0 1500 ovpnc1 10.XX.X.53 link#12 UH 0 0 1500 ovpnc1 10.XX.X.54 link#12 UHS 0 0 16384 lo0 ZZ.XX.XXX.0/20 link#1 U 0 83 1500 re0 ZZ.XX.XXX.XXX link#1 UHS 0 0 16384 lo0 127.0.0.1 link#9 UH 0 12 16384 lo0 128.0.0.0/1 10.11.0.53 UGS 0 123 1500 ovpnc1 192.168.1.0/24 link#11 U 0 1434 1500 ue0 192.168.1.1 link#11 UHS 0 0 16384 lo0 YYY.YYY.YYY.YYY/32 ZZ.XX.XXX.1 UGS 0 249 1500 re0 IP addresses 10.XX.X.53/54 - My DHCP-assigned IP address/pair from the VPN provider ZZ.XX.XXX.XXX - My external IP assigned by my ISP YYY.YYY.YYY.YYY - The external IP assigned by the VPN provider Interfaces ovpnc1 - My VPN client interface re0 - My LAN interface ue0 - My WAN interface This looks essentially what I would expect it to be. The default route is through the VPN provider. The VPN address is routed through the ISP-assigned IP address. I am not sure what would be wrong here. So figuring this was a firewall issue, I basically tried enabling all in/out traffic. This did not seem to remedy the problem. Also figuring it could possibly be some client networking issue, I restarted the clients on the LAN. This did not help. I also ran route flush and reset the routes manually. So I am a bit stumped, and would be very grateful for any thoughts on what the problem might be.

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custom route not working on windows

- by Michael Closson

My windows laptop is directly connected to 192.168.1.0/24 (wireless lan). I access 10.21.0.0/16 though a router that is connected to both networks. The routing works fine with this configuration. I have a VPN, that connects to 10.0.0.0/8. The VPN network doesn't actually use any IPs in the 10.21.0.0/16 range. So I should be able to configure my routing table to route all the 10.21.0.0/16 IPs through the wireless lan, and all other 10.0.0.0/8 through the VPN. My understanding is that I can do this if the metric for the 10.21.0.0 is lower than that of the 10.0.0.0. The VPN (10.0.0.0) is automatically assigned metric 20. I have manually assigned the WLAN a metric of 1. I manually add an entry to the routing table with this command: route add 10.21.0.0 mask 255.255.0.0 192.168.1.201 metric 1 The route is then assigned a metric of 2 (which is expected). The problem is that it doesn't work. I can't ping any machine on the 10.21.0.0 network. But I can access other stuff on the 10.0.0.0. I can also access stuff on the 192.168.1.0. To debug this i've done the following. Run tcpdump on the router (192.168.1.201). I can verify that no packets for 10.21.0.0 arrive on that interface. Disable iptables on the router. Disable the windows firewall. Run wireshark on my laptop, to try and see which interface the ping requests go to. But I can't see them go anywhere!! The ping command doesn't receive any 'destination unreachable' messages. Here is the relevant section of the routing table. IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.201 192.168.1.18 2 10.0.0.0 255.0.0.0 On-link 10.55.44.203 20 10.21.0.0 255.255.0.0 192.168.1.201 192.168.1.18 2

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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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Dynamips Virtual Router not pinging external host after bridging

- by maiky

I have setup a virtual router image with dynamips and setup bridging between tap0 interface of the virtual router and eth0 and br0 with commands [root@cisco_host]# brctl addbr br0 [root@cisco_host]# ifconfig br0 up [root@cisco_host]# ifconfig eth1 0.0.0.0 [root@cisco_host]# brctl addif br0 eth1 [root@cisco_host]# ifconfig br0 192.168.0.100 netmask 255.255.255.0 up In dynagen configuration I have: f0/0 = NIO_tap:tap0 So, [root@cisco_host]# brctl addif br0 tap0 [root@cisco_host]# ifconfig tap0 up router(config)#int fa0/0 router(config-if)#ip address 192.168.0.101 255.255.255.0 router(config-if)#no shutdown After the configuration above I was expecting that from inside the router I could ping an external machine with IP 192.168.0.1 Actually from the host I can ping the external host 192.168.0.1 as well as 192.168.0.100 and 192.168.0.101. So what am I missing here? tap0 is bridged with br0 and in turn with eth1. So why the router is not pingable from 192.168.0.1 and vice-versa??

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Can't access internet using a domain joined computer outside the domain environment

- by Mike Walsh

We had an unused box at work so took it home. It had been joined to the domain and hasn't been unjoined. When I try to use it at home (logging in with a local admin account) I can't seem to access internet pages. It gets correct IP and gateway for the local network and correct DNS servers for the home ADSL connection. I can happily ping the home router (which doesn't have any tricky firewall settings). Can't seem to ping outside, get any DNS to resolve, or (obviously) get any web pages. Is there some problem here with this having been joined to the domain?

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Windows 2003 Enterprise Server becomes unresponsive occasionally

- by Derek Ivey

We're experiencing issues with our Windows 2003 server, which runs SQL Server 2005 SP1. We notice that sometimes the entire server becomes unresponsive and I captured a screenshot of the task manager when this happened. I noticed that the processes are not displayed during this time and all of the memory information and handles disappear (as shown in the screenshot). Does anyone have any ideas as to what could be wrong with this sytem? I'm planning to take it down over the weekend to run Memtest86. Screenshot: http://dl.dropbox.com/u/2058/windows_screenshot.png The issue is resolved by a reboot, but I'd like to figure out the cause of this and get it fixed. I also tried to run a ping when this occurred and I got the following error in the event log: "Application popup: ping.exe - Application Error: The application failed to initialize properly (0xc0000142). Click on OK to terminate the application." Thanks, Derek

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KVM/Libvirt bridged/routed networking not working on newer guest kernels

- by SharkWipf

I have a dedicated server running Debian 6, with Libvirt (0.9.11.3) and Qemu-KVM (qemu-kvm-1.0+dfsg-11, Debian). I am having a problem getting bridged/routed networking to work in KVM guests with newer kernels (2.6.38). NATted networking works fine though. Older kernels work perfectly fine as well. The host kernel is at version 3.2.0-2-amd64, the problem was also there on an older host kernel. The contents of the host's /etc/network/interfaces (ip removed): # Loopback device: auto lo iface lo inet loopback # bridge auto br0 iface br0 inet static address 176.9.xx.xx broadcast 176.9.xx.xx netmask 255.255.255.224 gateway 176.9.xx.xx pointopoint 176.9.xx.xx bridge_ports eth0 bridge_stp off bridge_maxwait 0 bridge_fd 0 up route add -host 176.9.xx.xx dev br0 # VM IP post-up mii-tool -F 100baseTx-FD br0 # default route to access subnet up route add -net 176.9.xx.xx netmask 255.255.255.224 gw 176.9.xx.xx br0 The output of ifconfig -a on the host: br0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 inet addr:176.9.xx.xx Bcast:176.9.xx.xx Mask:255.255.255.224 inet6 addr: fe80::5604:a6ff:fe8a:6613/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:20216729 errors:0 dropped:0 overruns:0 frame:0 TX packets:19962220 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:14144528601 (13.1 GiB) TX bytes:7990702656 (7.4 GiB) eth0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:26991788 errors:0 dropped:12066 overruns:0 frame:0 TX packets:19737261 errors:270082 dropped:0 overruns:0 carrier:270082 collisions:1686317 txqueuelen:1000 RX bytes:15459970915 (14.3 GiB) TX bytes:6661808415 (6.2 GiB) Interrupt:17 Memory:fe500000-fe520000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:6240133 errors:0 dropped:0 overruns:0 frame:0 TX packets:6240133 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6081956230 (5.6 GiB) TX bytes:6081956230 (5.6 GiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:79:e4:5a inet addr:192.168.100.1 Bcast:192.168.100.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:225016 errors:0 dropped:0 overruns:0 frame:0 TX packets:412958 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:16284276 (15.5 MiB) TX bytes:687827984 (655.9 MiB) virbr0-nic Link encap:Ethernet HWaddr 52:54:00:79:e4:5a BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vnet0 Link encap:Ethernet HWaddr fe:54:00:93:4e:68 inet6 addr: fe80::fc54:ff:fe93:4e68/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:607670 errors:0 dropped:0 overruns:0 frame:0 TX packets:5932089 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:83574773 (79.7 MiB) TX bytes:1092482370 (1.0 GiB) vnet1 Link encap:Ethernet HWaddr fe:54:00:ed:6a:43 inet6 addr: fe80::fc54:ff:feed:6a43/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:922132 errors:0 dropped:0 overruns:0 frame:0 TX packets:6342375 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:251091242 (239.4 MiB) TX bytes:1629079567 (1.5 GiB) vnet2 Link encap:Ethernet HWaddr fe:54:00:0d:cb:3d inet6 addr: fe80::fc54:ff:fe0d:cb3d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:9461 errors:0 dropped:0 overruns:0 frame:0 TX packets:665189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:4990275 (4.7 MiB) TX bytes:49229647 (46.9 MiB) vnet3 Link encap:Ethernet HWaddr fe:54:cd:83:eb:aa inet6 addr: fe80::fc54:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1649 errors:0 dropped:0 overruns:0 frame:0 TX packets:12177 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:77233 (75.4 KiB) TX bytes:2127934 (2.0 MiB) The guest's /etc/network/interfaces, in this case running Ubuntu 12.04 (ip removed): # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 176.9.xx.xx netmask 255.255.255.248 gateway 176.9.xx.xx # Host IP pointopoint 176.9.xx.xx # Host IP dns-nameservers 8.8.8.8 8.8.4.4 The output of ifconfig -a on the guest: eth0 Link encap:Ethernet HWaddr 52:54:cd:83:eb:aa inet addr:176.9.xx.xx Bcast:0.0.0.0 Mask:255.255.255.255 inet6 addr: fe80::5054:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14190 errors:0 dropped:0 overruns:0 frame:0 TX packets:1768 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2614642 (2.6 MB) TX bytes:82700 (82.7 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:954 errors:0 dropped:0 overruns:0 frame:0 TX packets:954 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:176679 (176.6 KB) TX bytes:176679 (176.6 KB) Output of ping -c4 on the guest: PING google.nl (173.194.35.151) 56(84) bytes of data. 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=1 ttl=55 time=14.7 ms From static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx): icmp_seq=2 Redirect Host(New nexthop: static.161.82.9.176.clients.your-server.de (176.9.82.161)) 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=2 ttl=55 time=15.1 ms From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=3 Destination Host Unreachable From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=4 Destination Host Unreachable --- google.nl ping statistics --- 4 packets transmitted, 2 received, +2 errors, 50% packet loss, time 3002ms rtt min/avg/max/mdev = 14.797/14.983/15.170/0.223 ms, pipe 2 The static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx) is the host's IP. I have encountered this problem with every guest OS I've tried, that being Fedora, Ubuntu (server/desktop) and Debian with an upgraded kernel. I've also tried compiling the guest kernel myself, to no avail. I have no problem with recompiling a kernel, though the host cannot afford any downtime. Any ideas on this problem are very welcome. EDIT: I can ping the host from inside the guest.

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How to SSH to guest ubuntu OS in vmplayer4

- by Grace

I have installed vmplayer4.0.4 on Windows7, and install ubuntu12.04 as Guest OS. Basically i have two problems: Default vmplayer use NAT for network access. I could ping the guest OS from the Host OS. But how could i access the Guest OS from outside the Host OS? If i change to Bridged Mode, sure the Guest Ubuntu OS could get DHCP ip in the same subnet as Host OS. But i could not ping the Guest OS from the Host OS, or vice versa, even if i disable the iptables firewall on Ubuntu Guest OS like following: iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT I could not figure it out, could anyone help on this issue? Thanks in advance.

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VM can't connect to outside in bridged mode

- by Kamal

I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have.

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esxi VM will not connect to virual switch

- by NitroxDM

I have a exsi box with a VM (Windows 2003) that will not connect to any of the switches. The switch shows the VM connected but I can not ping anything on the network. I have double checked the VM's IP. No dice. There are a ton of messages in the log: [DATE 'VmMisc' NNNNN warning] Failed to validate VM IP address: unknown Update: There are 3 other VMs. Each vSwitch has 56 ports. I can ping from one nic to the other. Each vSwitch shows that the new VM is connect. VMware ESX Server 3i V 3.5.9 Build 123629 Update 2: Out of the blue it just started working. I didn't change anything. I think it has something to do with RRAS.

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Unable to setup ssh tunnel on mac

- by prashant

On my office windows XP laptop I use a program called Bitvise Tunnelier to establish ssh tunnel to a in-house MySQL database. In the Tunnelier program I also need to provide address of corporate http proxy server in order to establish tunnel. On my personal mac laptop, I use Cisco Anywhere client to establish a VPN connection to my corporate network. But i'm unable to establish ssh tunnel to mysql database using ssh. How do I specify the proxy server address in the ssh command? As additional info when i'm using office laptop (whether in home or office) I can successfully ping to the server address specified in the Tunnelier program. But i cannot ping the same server using my mac machine (even after connecting via VPN). So basically i'm unable to understand what's going on and what steps i can take to debug this problem .

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Remote Desktop to Virtual Machine

- by Valvaris

Hello: I recently reformatted one of my servers with Windows Server 2008 x64 and with that, installed the latest version of VMWare server on it. Within that, I created a new Windows Server 2003 R2 x86 virtual machine for the purposes of being a backup domain controller. I was able to successfully configure it as a domain controller and have it provide DNS service to my domain. I've been using the VMWare remote console to set this up and figured it was time to get remote desktop working. I set it up as I have with many other computers on my network (hitting the checkbox, making the firewall isn't blocking it) and I cannot get remote desktop to connect to it. I've tried using the computer name and its IP address neither work. I can ping the computer from the outside but the Virtual machine cannot ping anything from inside it. All machines are on the same subnet. I can't seem to figure this out.

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What could prevent one Amazon EC2 instance from pinging another instance's Private IP?

- by ks78

I have multiple Amazon EC2 instances which need to communicate using private IPs. However, so far I've been unable to ping one instance's private IP from another instance. I can ping external addresses, such as their Elastic IPs and other sites (yahoo, google, etc), so it seems there's nothing wrong with the instances' network configuration. Also, they are all in the same zone, so that shouldn't be an issue. Does anyone have any idea what I could be doing wrong? Could this related to the Security Group settings?

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CNTLM issue with intranet (maybe DNS)

- by htorque

On my Linux box I need to use an ISA proxy that requires authentication to reach the internet. I therefore installed CNTLM and configured it to point to the proxy address and listen on port 4321. I then configured my GNOME distribution to use localhost:4321 as global proxy for HTTP and HTTPS. The result: I can connect to the internet. I can ping intranet IPs, I do receive name resolution for intranet sites, yet I cannot ping them or open any intranet site in a browser (configured to use the distributions proxy) unless I use the site's IP address. I tried blocking the intranet IP range in the CNTLM config file without luck.

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Linux clients and Windows Servers can connect but not windows clients

- by Mustafa Ismail Mustafa

This is driving me insane because I can't make head or tails of it. We have two DCs (W2K3 SP1) and I'v tried this once on each machine as a sanity check. DHCP is being served by either one of the machines and all machines get an address no problem. The servers can connect/ping/browse to the www and so can all our linux clients. But NONE of our windows clients (all windows 7). I can do anything within the network, I can even ping the firewall/router but nothing from the windows clients is leaving the confines of our subnet. I don't get it. The linux and windows clients are both served from the same DHCP server, the gateway is the same, everything is the same. Anyone care to take a shot at how to resolve this? I tried adding explicit routes at the clients, but still no go. TIA SMIM

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Block IP Address including ICMP using UFW

- by dr jimbob

I prefer ufw to iptables for configuring my software firewall. After reading about this vulnerability also on askubuntu, I decided to block the fixed IP of the control server: 212.7.208.65. I don't think I'm vulnerable to this particular worm (and understand the IP could easily change), but wanted to answer this particular comment about how you would configure a firewall to block it. I planned on using: # sudo ufw deny to 212.7.208.65 # sudo ufw deny from 212.7.208.65 However as a test that the rules were working, I tried pinging after I setup the rules and saw that my default ufw settings let ICMP through even from an IP address set to REJECT or DENY. # ping 212.7.208.65 PING 212.7.208.65 (212.7.208.65) 56(84) bytes of data. 64 bytes from 212.7.208.65: icmp_seq=1 ttl=52 time=79.6 ms ^C --- 212.7.208.65 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 79.630/79.630/79.630/0.000 ms Now, I'm worried that my ICMP settings are too generous (conceivably this or a future worm could setup an ICMP tunnel to bypass my firewall rules). I believe this is the relevant part of my iptables rules is given below (and even though grep doesn't show it; the rules are associated with the chains shown): # sudo iptables -L -n | grep -E '(INPUT|user-input|before-input|icmp |212.7.208.65)' Chain INPUT (policy DROP) ufw-before-input all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-before-input (1 references) ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 4 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 11 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 12 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8 ufw-user-input all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-user-input (1 references) DROP all -- 0.0.0.0/0 212.7.208.65 DROP all -- 212.7.208.65 0.0.0.0/0 How should I go about making it so ufw blocks ICMP when I specifically attempt to block an IP address? My /etc/ufw/before.rules has in part: # ok icmp codes -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT -A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT -A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT -A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT -A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT I'm tried changing ACCEPT above to ufw-user-input: # ok icmp codes -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ufw-user-input -A ufw-before-input -p icmp --icmp-type source-quench -j ufw-user-input -A ufw-before-input -p icmp --icmp-type time-exceeded -j ufw-user-input -A ufw-before-input -p icmp --icmp-type parameter-problem -j ufw-user-input -A ufw-before-input -p icmp --icmp-type echo-request -j ufw-user-input But ufw wouldn't restart after that. I'm not sure why (still troubleshooting) and also not sure if this is sensible? Will there be any negative effects (besides forcing the software firewall to force ICMP through a few more rules)?

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windows 7 file and printer sharing doesnt work for me

- by EmRa228

a few days ago, i havent any problem but now I cant use file and printer sharing on the windows 7 but everyone on the network can. maybe I install some program that make this change or disable a windows services! (Like: proxifier, ...) Now: -I can ping everyone on the network. -everyone can ping me. -I cant see their computers in windows 7 "Networks" So, I cant use file and printer sharing. -everyone can see my computer in windows 7 "Networks" and also can use my file and printer sharing. -with a LAN messenger program, we(I & everyone) can text chat, video chat and transfer file. . . I want see another computer on the network and use windows 7 file and printer sharing!!!

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Anytime I upload something, my internet slows down extremely. What can I do?

- by Earlz

Title says it all. For a bit more info though: Basically, I have Time Warner cable internet. My speeds maintain a stable 2Mbit/s upload and 20Mbit/s download with average ping times around 30ms. This crazy thing happens though when I upload anything. I went to upload a 200M file to my server today through sftp and my internet completely choked up. I speed tested it during this upload and my ping time was around 800ms, download speeds of 0.2Mbit/s and Upload speeds of 0.3Mbit/s. Note, I wasn't downloading anything during this time either. It is just straight upload. What is it that causes this phenomenon? My router is OpenBSD. Is there anything I could set up to fix this problem(by queues or some such), or is this a problem with cable internet?

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Mysterious problem...can remotely connect to a system but can't browse back out.

- by GregH

I have LogMeIn installed on my home system. I went on travel and my wife called saying that none of our home systems could browse the internet. I thought I would try to connect to my home system using logmein. Surprisingly, I was able to connect to my home system and log in without any problems using logmein. When I opened a browser from my home system, I indeed could not browse. I opened a command prompt and tried to ping my router (192.168.1.1) and it failed/timed out. How is this possible? I can remotely connect to my system but once logged in cannot even ping my router. What's up with that?

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