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  • Attempting to caue packet loss with netem doesn't work - possibly because of NAT (but delay does work)

    - by tomdee
    I have traffic from a WIFI access point routed via an Ubuntu box. I have two network interfaces which are NATed *filter :INPUT ACCEPT [11:690] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [37:6224] -A FORWARD -s 192.168.2.0/24 -i eth1 -o eth0 -m conntrack --ctstate NEW -j ACCEPT -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Mar 15 13:37:21 2012 # Generated by iptables-save v1.4.10 on Thu Mar 15 13:37:21 2012 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -j MASQUERADE COMMIT If I run a ping app on an Android device connected to the WIFI network I can happily ping google. If I use netem to introduce some delay tc qdisc change dev eth0 root netem delay 100ms I can clearly see pings taking longer. If I use netem to introduce some packet loss tc qdisc change dev ifb0 root netem loss 50% then I see no change. Packet loss does work fine for locally generated traffic, just not for traffic coming in over the network that's being NATed. Any ideas how to sort this out?

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  • diagnostic software for wifi adapter

    - by Nathan Fellman
    I'm having trouble with my wifi connection. Is there any software out there that can help me determine if the problem is in the drivers or in the hardware? Regretfully, I'm working on Vista Edit: The problem I'm having is that the Vista reports that the wireless radio is connected, shows an IP and all, the router also shows that the computer is connected, but there's no connectivity. I can't logon to the router, and I can't even ping it. When I ping it I get the response: General Failure I have tried connecting with and without various wireless security protocols. I have tried disabling the wireless adapter and re-enabling it from the Device Manager I have tried updating the driver None of this has helped. When I connect via Ethernet (with a cable, that is), everything works fine. Edit: I'm not using any firewall on the computer, that I'm aware of. The IP address for the WIFI adapter is similar to the one for the LAN adapter. They differ by one.

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  • Setting a wireless access point on Ubuntu server 11.10

    - by Solignis
    I am trying to setup a wifi access point with my Ubuntu server. I have managed to get my phone to connect the wireless and now it get a DHCP lease. Though it still cannot ping out or get pinged by anything on my network. I am prety sure my problem is iptables, but I not sure what would be wrong. Here is what my rules look like. (The ones pertaining to the bridge interface) # Allow traffic to / from wireless bridge interface iptables -A INPUT -i br0 -j ACCEPT iptables -A OUTPUT -o br0 -j ACCEPT I am guessing my rules are a little lean, the bridge exists on the same subnet as everything else on my network, I am using a 10.0.0.0/24 subnet. EDIT Oh yeah I should mention also, when I do a ping test, I get Destination Host Unreachable as the error.

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  • Shared resources in Windows Server 2008 were lost

    - by user316687
    We have an Oracle database in Windows Server 2003, which has its archived redo logs stored on a shared resource of a Windows Server 2008: \\192.168.1.189\d$\folder_for_archivedlogs However, according to Oracle's alert.log, at 10:01 p.m that shared resource got lost and the database was inaccessible. From my Windows Server 2003, on Windows Explorer, I couldn't access that shared resource, but I got a response when I did ping 192.168.1.189. I reviewed all the Event Logs on that Windows 2008, but there is no error at 10:00pm or 11:00pm. Has anyone seen some similar case before? (Shared resources get lost, but you still can ping the server and there are no error events in the Event Logs).

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  • VMware 1.0.1 Windows7 - Ubuntu hostnames

    - by Kyle K
    I'm trying to run Ubuntu as the guest OS using VMWware 1.0.10 with Windows 7 Ultimate as the host OS. I had this set up previously with Win XP as the host OS and in fact I'm using the same .vmx My problem is I can't get either Win7 or Ubuntu to be able to ping the other by hostname. After installing Samba and Winbind on Ubuntu, I was able to get this working when under WinXP, but for some reason I can't get it to work under Win7. I can ping by IP Address, and the guest OS even shows up by hostname under the Windows networking panel (but of course I can't do anything with it), but pinging using short hostnames just won't work. Also, Win7 firewall is turned off completely.

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  • How to enable RDP to a Server 2008 R2 on another network? VM network

    - by Saariko
    I have a W2008 R2 installed on a different network (I am on 192.168.0.x - new server on 192.168.3.x) I had trouble ping and RDP to it. I disabled the firewall to test the connection: and that opened the ping feature but I still can not RDP to that machine. the allow remote access is enabled As per sinni80 idea - Here is the error message The networks are divided by a Fortigate 60-B router - 2ndy interface for the gateway is 192.168.3.254 (and pingable from all) any to any rule on both networks is in place. As per Joe Schmoe idea - I am able to RDP to 192.168.3.1 from 192.168.3.3 (which is on the same network) Data to add: - The servers are on a VM host, each of the servers has 2 nics one is DHCP enabled into the 192.168.0.x network 2nd is static IP in the 192.168.3.x -- Further information: The network 192.168.0.x - are on a domain network (active Directory) The network 192.168.3.x - are grouped in a workgroup What should I check more please?

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  • How to integrate monit into web app deployment process

    - by shabunc
    I have: Tomcat with webapp deployed via mvn tomcat:redeploy. Monit, pinging the host and restarting server if ping failed. The thing is there in a moment during the redeployment when ping will fail - and this is normal, actually. So, the question is - what is the best way to teach monit to consider the fact of redeployment and not to confuse it with "real" black outs. This is of course an issue of balance between elegance, ease of implementation and scalability. The most straightforward solution I can think of - is just to shutdown monit before deployment and start it up after once again. But this if far from elegance I guess.

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  • Virtualbox - routing subnet to bridge adapters

    - by user42384
    Hello, I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic flowed to and from the IPs of the virtual machines as it should. However, now that it's in its co-lo home, the networking setup is a bit different, and I'm unable to get traffic to flow to the vboxes properly. Specifically, the host has its own Primary IP, and I have a separate subnet of 8 (6 usable) IPs routed to the box for use by the vboxes. So, eth0 on host is: Machine IP: 2x.x.x.137 Gateway IP: 2x.x.x.138 Subnet Msk: 255.255.255.252 Subnet for vboxes is Subnet: 2x.x.x.240/29 Netmask: 255.255.255.248 vbox1 is configured to 2x.x.x.241 on eth0 as follows: auto eth0 iface eth0 inet static address 2x.x.x.241 netmask 255.255.255.248 Setting up a virtual interface (eth0:0) on the host with one of these subnet IPs allows me to ping to that address only from vbox1, and it allows me to ping vbox1 from the host. I can also ping that virtual interface perfectly well from outside, so the IPs are definitely landing at my machine. It seems I'm missing some sort of routing instruction either on the host or vbox1 to get traffic moving between the subnet and the default gateway, but I can't seem to figure out what it should be, or what glaringly obvious thing i'm missing. Most of my obvious attempts (the gw of eth0, the ip of eth0) were rejected by route command with SIOCADDRT: No such device (eg - i can't find it). I tried setting vbox1 to bridge on eth0:0, but this was not an acceptable device name and VBoxHeadless refused to start. The physical machine does have an unused physical NIC at eth1 that can be used if necessary for something or other. Host machine is running iptables configured by ferm, have experimented with it allowing forwarding for that subnet, but I wouldn't have thought this was necessary given the nature of the virtualbox devices (nor did it actually work). Clearing out all of these rules for a blank iptables set does not resolve the issue. (you can see ferm generated iptables at http://codedumper.com/ojaze) Thanks for any help you can give... Patrick

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  • Sharing wireless internet connection between 2 Ubuntu 10.04 systems using cross-over cable

    - by Gary
    I have a Lenovo T60 with Ubuntu 10.04 connected with a cross-over cable to a Dell Vostro 1400, also running Ubuntu 10.04. My internet is coming into the Lenovo through an external wireless antennae, and I want to share the internet with the Dell. On the Lenovo: eth0 connection has IPv4 Settings 'Shared to other computers' I can ping the Dell (10.42.43.10) successfully I can use mtr to trace to www.google.com successfully On the Dell: eth0 connection has IPv4 Settings 'Automatic DHCP' I can ping the Lenovo (10.42.43.1) successfully when I use mtr to trace to www.google.com, I can only reach 10.42.43.1 I must be missing some setting, but cannot see what it is; can anyone help me?

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  • Windows Server 2008 R2 loses ability to connect to network share

    - by JamesB
    I could sure use some help with this one: I've got two Windows Server 2008 R2 x64 Terminal Servers, as well as several 2003 servers (DNS / Wins / AD / DC). On the two 2008 boxes, every now and then they will get in this mode where you can't map a drive to a random server. I say random server because it's not always the same server that you can't map to. Here is a summary of what I can and can't do: net view \\servername Sometimes this works, sometimes it does not. net view \\FQDN This always works. net view \\IPAddress This always works. ping servername Sometimes this works, sometimes it does not. ping FQDN This always works. ping IPAddress This always works. I've been looking all over for a solution to this. It sure seems like Microsoft would have a hotfix by now. The kicker to this is that it sometimes works great, especially after a reboot. It may run for 2 weeks just fine, but all of a sudden it will fail to resolve the remote server name. It will then be this way for a few days, then it might start working again. Also, while it's in the mode of not working, the other servers have no problem getting there. It's just these 2008 R2 Terminal Servers. Setting a static entry in the Hosts file and LMHosts does not make it work. All servers have static IPs and they are registered in DNS and Wins just fine. Here is a long thread on MS Technet of the exact same problem, but they don't have a good solution. Here is their workaround (It was from June of 2010): Good news - a hotfix is in the works and a workaround has been identified: Root cause is that since this is SMB1 all user sessions are on a single TCP connection to the remote server. The first user to initiate a connection to the remote SMB server has their logon-ID added to the structure defining the connection. If that user logs off all subsequent uses of that TCP session fail as the logon-id is no longer valid. As a workaround for now to keep the issue from happening you will want to have the user not logoff the Terminal Server only disconnect their sessions. Any word from anyone out there about a solution? Any help would sure be appreciated. Thanks, James

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  • All invalid hosts gets resolved to "com.org"

    - by Vi
    vi@vi-server:~$ nslookup nonexistent.itransition.com Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find nonexistent.itransition.com: NXDOMAIN vi@vi-server:~$ cat /etc/resolv.conf nameserver 8.8.8.8 It does not exist. The same result from dig nonexistent.itransition.com. vi@vi-server:~$ ping nonexistent.itransition.com PING nonexistent.itransition.com.org (216.234.246.153) 56(84) bytes of data. 64 bytes from 99.f6.ead8.static.theplanet.com (216.234.246.153): icmp_seq=1 ttl=46 time=128 ms 64 bytes from 99.f6.ead8.static.theplanet.com (216.234.246.153): icmp_seq=2 ttl=46 time=128 ms It catches all invalid hostnames? Why? How to prevent?

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  • IPv6 routing to another interface

    - by Robert
    I'm trying to get an IPv6 enabled router to forward data from one interface to the other and I'm having issues. When following this example (http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080ba6106.shtml) I am able to get full connectivity between all 3 routers in my simulator. However when I try to use only 1 router; I can't get connectivity to the other interfacs on the same router. My PC is directly attached to FA 0/1 and it can ping the router's interface. However it can not ping any other interface on the router(which unless I'm missing something it should be able to do). The router on the other hand can ping everything. I thought static routes might help; but the router already has routes for everything. I'm thinking the packet should come in; router looks up the destination in it's ipv6 routing table and then realizes it's for itself, and should respond. I thought maybe it couldn't respond directly; so I tried pinging a device like 2001:0000:0000:1000::2, but i don't get a response. I'm running on IOS 12.4. I'm missing something(hopefully simple), but I just can't see what it is. With only 1 router; how do I enable my PC to talk to the other subnets? Thank you in advance, Robert Topology: R1 FA 0/0: 2001:0000:0000:0000::1/52 FA 0/1: 2001:0000:0000:1000::1/52 FA 1/0: 2001:0000:0000:2000::1/52 Loopback 0: 2001:0000:0000:3000::1/52 PC: 2001:0000:0000:2000::2/52 PC plugs directly into FA 1/0 on the router. --- Configuration --- ipv6 cef ipv6 unicast routing interface Loopback0 no ip address ipv6 address 2001:0000:0000:3000::1/52 ipv6 enable ! interface FastEthernet0/0 no ip address duplex auto speed auto ipv6 address 2001:0000:0000::1/52 ipv6 enable ! interface FastEthernet0/1 no ip address duplex auto speed auto ipv6 address 2001:0000:0000:1000::1/52 ipv6 enable ! interface FastEthernet1/0 no ip address duplex auto speed auto ipv6 address 2001:0000:0000:2000::1/52 ipv6 enable --- end of config --- --- routing table --- IPV6Lab#show ipv6 route IPv6 Routing Table - 10 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP U - Per-user Static route I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 C 2001:0000:0000::/52 [0/0] via ::, FastEthernet0/0 L 2001:0000:0000::1/128 [0/0] via ::, FastEthernet0/0 C 2001:0000:0000:1000::/52 [0/0] via ::, FastEthernet0/1 L 2001:0000:0000:1000::1/128 [0/0] via ::, FastEthernet0/1 C 2001:0000:0000:2000::/52 [0/0] via ::, FastEthernet1/0 L 2001:0000:0000:2000::1/128 [0/0] via ::, FastEthernet1/0 C 2001:0000:0000:3000::/52 [0/0] via ::, Loopback0 L 2001:0000:0000:3000::1/128 [0/0] via ::, Loopback0 L FE80::/10 [0/0] via ::, Null0 L FF00::/8 [0/0] via ::, Null0 --- end of routing table ---

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  • why this routing configuration does not work?

    - by avs099
    I have 2 VMs in HyperV role: first is RRAS - it has 2 interfaces (both manually configured, no DHCP): 192.168.1.110 - "external" one, connected to the router 192.168.10.2 - that's internal interface which other VMs will be using as well also I added VPN connection to our main server - and it gets 192.168.2.136 IP address in 192.168.2.XXX network. And IP route is create on the server as well for this interface. second VM is called KITCHENER. It only has 1 interface 192.168.10.99 / 255.255.255.0, with default gateway set to RRAS server - 192.168.10.2 QUESTION: how can I ping "main server" - 192.168.2.1 - from the KITCHENER server when RRAS server is connected to VPN? please see screenshots with ipconfig /all, route print and ping 192.168.2.1 commands. What needs to be done to get this working? all servers are Windows 2008 R2 if that matters.

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  • Comunication from Server to Client + Client LAN

    - by Filipe YaBa Polido
    I'm having some trouble with some network setup. I've tried OpenVPN, SocialVPN, Hamachi, still it is not working. This is my setup: Server A: NIC 1 with internet public address, NIC 2 to LAN Client B PC: NIC 1 (192.168.10.2) connects to router 192.168.10.1 Client B Device: 192.168.10.3 (Configured via software, can't do much here) Problem: Server A must connect to cliente device B. (I can install software needed at Client B PC). However... I can't change the router to some model with VPN like Draytek or Cisco :( OpenVPN fails at bridging, PC B can ping Server A, but Server A can't ping Device B, only PC B. What else can I do?!?!?

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  • Error while trying to configure VLAN with Open vSwitch

    - by Abhishek Chanda
    I am trying to connect a number of VMs using Open vSwitch. The VMs are on two separate physical boxes. Here is what I did: Created two tap devices on one physical host sudo ip tuntap add mode tap tap0 and same for tap1 Bring them up sudo ip link set tap0 up Add them as ports to Open vSwitch (br0 was created as a OVS bridge previously) sudo ovs-vsctl add-port br0 tap0 tag=1 Now I booted the VMs (using VirtualBox) and assigned addresses 192.168.122.11 and 192.168.122.12. Now when I try to ping one VM from another, I get the error Connect: network is unreachable. Since both VMs are connected to the switch on the same VLAN, I expect to be able to ping one from another. What is going wrong here?

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  • IP issue with Heartbeat & DRBD

    - by adam0345
    I'm in the process of setting up 3-node stacked DRBD, and i'm experiencing a rather bizarre issue. Two nodes are located at the data center, and the 3rd node is located locally. The Primary and Secondary nodes are working as expected, however the 3rd node won't connect to the primary. If I ping the IP provided by heartbeat on the 3rd node it will return 100% packet loss, if I reset networking interfaces, ping will then return a few successful packets, but then stop returning any packets. I can't work out any reason why this would be behaving like this. All nodes are running Debian Squeeze, and the latest version of DRBD.

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  • How do I remote desktop to my work's Windows box from my Mac at home through VPN?

    - by CT
    I would like to remote desktop from my Macbook to my Work's laptop from home. I connect to the work's network via Cisco VPN. My Cisco VPN clients connects fine in Mac OS X but I am unable to remote desktop. I am also unable to ping my work laptop. The laptop is powered on and not sleeping. I can access it via LogMeIn. If I were to actually pug into our network at the building. I can remote desktop to my work laptop from my Macbook. If I use a Windows virtual machine and connect using the Windows Cisco VPN client, I am able to RDP and ping my work laptop. What is wrong with my OS X VPN connection?

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  • Relation between Apache and DNS configuration

    - by KayKay
    I configured my DNS (bind9) to accept every subdomain, using a wildcarded 'A' record : *.mydomain.tld. IN A xx.xx.xx.xx I configured Apache to serve some specific subdomains using virtual hosts : <VirtualHost *:80> ServerName sub1.mydomain.tld ServerAlias sub1.mydomain.tld JkMount / sub1JK JkMount /* sub1JK </VirtualHost> when I ping from a remote computer on a subdomain configured in apache I get a response. When I ping on a subdomain that is not configured in apache, the host is not found. I don't understand why apache configuration would affect DNS resolution like this? I would appreciate any information that helps me understand this. Thanks a lot.

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  • my domain.com is pointing to two different IP addresses

    - by user43726
    Initially my domain , mycompany.com points to this IP: - 123.456.789.101 (sample only) Then i got another VPS and then decided to move the mycompany.com into this new IP/Host: - 987-654-123.123 (sample only) I changed the necessary stuff like DNS, etc. from my domain management panel. But when i ping it : ping mycompany.com , sometimes it gives the first IP, sometimes the second one. Also when i visit the url from the browser, sometimes it loads, sometimes it doesn't. How can i solve this? Please help. Thanks

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  • getaddrinfo(3) failed

    - by user101289
    I'm trying to connect to a webservice using a PHP wrapper (which is using curl under the covers). On my local linux machine running PHP 5.3 it works perfectly. However, when I move to a remote server (also running PHP 5.3 on Linux) the call the the webservice URL returns: getaddrinfo(3) failed for http://server.host.com:8080/login I get a similar error from a ping on the remote host: ping: unknown host http://server.host.com:8080/login But when I issue a curl request from the command line, it returns the expected URL. Can anyone shed any light on this issue? Thanks!

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  • nmap reports host up when it isn't

    - by martianway
    On an Ubuntu VM I ran: sudo nmap -sP 192.168.0.* This returned: Starting Nmap 5.00 ( http://nmap.org ) at 2010-12-28 22:46 PST Host 192.168.0.0 is up (0.00064s latency). Host 192.168.0.1 is up (0.00078s latency). Host 192.168.0.2 is up (0.00011s latency). . . . Host 192.168.0.254 is up (0.00068s latency). Host 192.168.0.255 is up (0.00066s latency). The problem is I only have 4 live machines on 192.168.0.* so why did nmap report every ip in the subnet has a live host? The ip address of the Ubuntu machine is 192.168.28.131 From this VM I can ping the live systems on my internal subnet 192.168.0.* and get the expected response. And if I ping a machine that doesn't exist I can get no response as expected.

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  • How two use 2 subnets on one network

    - by BGuy2010
    I have some servers at a colocation. They've given us an IP range,subnet,and gateway. Now we have run out of IP's and they've given us a new range of IP's but with a different subnet and gateway. We have a Juniper NetScreen firewall and a load balancer, and I am not sure how to proceed in order to be able to use these new IPS that are on a different subnet. Do I need to setup a new VLAN? on our firewall? I tried adding one of the new IP's on one of our servers, with the new subnet and gateway. I could ping the alternate gateway, but could not ping the assigned IP from outside or from inside.

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  • WDS (Wireless Distribution System) not work [migrated]

    - by xdevel2000
    I've a dlink di-524 as main router (192.168.0.1) connected to Internet and a second router (192.168.0.2), a tplink wr841n, with WDS enabled and correctly configured to "join" with dlink. After I connect via wireless a laptop (192.168.0.100) to tplink and both work good but with the laptop I can't go to Internet. It seems as WDS not work. With the laptop I can only ping the tplink but other ping (the dlink or other LAN computer not responding). What's the problem? Perhaps also the dlink must have the WDS option? Thanks.

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  • Remote access to a KVM Ubuntu virtual server

    - by Lee
    I've just setup an ubuntu virtual server and everything seems to be working fine. I used KVM to get it working with a bridged network. I've given the virtual server a static ip address on my network. I don't seem to be able to connect to the virtual machine though from outside my network. If I'm on my own network it all works fine, I can ping the ip and connect to it. The virtual server can ping other machines and sites on the internet. I changed the port forwarding rules on my router to forward any connections on a specific port to the virtual server ip address thinking that was the problem, but it was still the same. Is there something I'm missing here which is blocking outside connections to the virtual machine? Thanks.

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  • WDS (Wireless Distribution System) not work

    - by xdevel2000
    I've a dlink di-524 as main router (192.168.0.1) connected to Internet and a second router (192.168.0.2), a tplink wr841n, with WDS enabled and correctly configured to "join" with dlink. After I connect via wireless a laptop (192.168.0.100) to tplink and both work good but with the laptop I can't go to Internet. It seems as WDS not work. With the laptop I can only ping the tplink but other ping (the dlink or other LAN computer not responding). What's the problem? Perhaps also the dlink must have the WDS option? Thanks.

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