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  • External routing for local interfaces in a virtualized network

    - by Arkaitz Jimenez
    Current setup: br0| |-- tun10 -pipe-tun0(192.240.240.1) |-- tun11 -pipe-tun1(192.240.240.2) |-- tun12 -pipe-tun2(192.240.240.3) The pipe program is a custom program that forwards data back2back between two tun interfaces. The idea is puting 2 programs in .2 and .3 while keeping .1 as the local interface in the current machine. The main problem is that I want to route packets to .2 and to .3 through .1 and br0, but as they are local interfaces, the kernel ignores any routing instruction, it just delivers the packet to the proper interface. Tried iptables, but the nat table doesn't even see ping packets to those ifaces. A "ping 192.240.240.2" delivers a icmp packet with source and dest .2 to tun1, ideally it should deliver a source .1 dest .2 at tun1 through tun0-br0-tun1 Any hint? Here the output of some commands: Output

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  • TCP Tweaking options and Results: Any suggestions?

    - by krishnakumar
    I first tried with the default windows XP TCP option(It doesn't have TCPWindowSize option and TCP1323 in its Registry setting). I dynamically set those options using TCP optimizer. Here I list out the result with and without TCP Tweaking option. I see no major improvements in TCP after increasing window size optimally too. What value should I set to increase the performance? Results: Without any window size and MTU setting from server to client (receiving) TCPWindowSize : MTU : TTL: Size:586 MB total duration : 03:47 With window size extension from server to client (receiving) Bandwidth :100 Mbps Latency: 100ms BDP :1250000 TCPWindowSize : 1250000 MTU :1500 TTL:128 Size:586MB total duration : 03:44 With window size extension from server to client (receiving) TCPWindowSize :64240 MTU :1500 TTL :112 Size: 586MB total duration : 03:49

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  • Which subnet masks are valid for a subnetted Class B address?

    - by Daddy Warbox
    Yes, this is a school question, and yes I already know the correct possible answers (supposedly), so I'm not going to bother posting them. Instead, I just want to understand the meaning of this question. I know what class B addresses are, and what valid class B subnet addresses are. I guess one way to define my question is to ask why the answer "255.255.0.0" is wrong, necessarily? That seems to defy my understanding, or else some part of my brain is just not registering the question correctly. Thanks in advance.

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  • How to setup a Wi-Fi 2-computer network with Internet sharing?

    - by Narek
    I have the following devices: Desktop Computer (Windows XP Professional) Laptop Computer (Windows Vista Home Premium) A USB modem that I want to connect to my Desktop computer (so my Desktop has Internet) And a Wi-Fi router (D-Link, model: DIR-300) that I want to use in order to create a connection between mentioned two computers to be able to share files and what is the most important thing to make my laptop to have access to the Internet. What steps I should do to have this system?

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  • wi-fi connection drops periodically for a few seconds

    - by sergiom
    I've read the similar question on wireless connections dropping, but no answer seems to apply to my case I have configured the wi-fi lan of my router to broadcast sid and use WPA-PSK. Every few minutes my wi-fi connection drops for a few seconds and then restores. When I use two computers and run a ping -n 50000 on both computers, I see that the connection drops at different times but with almost the same rate. the router is a zyxel, one pc runs windws vista and uses a USB wi-fi device from Belkin: F6D4050 the other one runs windows 7 is a Dell PC with an Intel(R) WiFi Link 5100 AGN there are no other wi-fi lans around

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  • Connect laptop to mobile wifi

    - by Arnab Sen Gupta
    I have a nokia N97. In my apartment there's a wifi network that we all use to connect to the internet. But for the past few days my laptop is not able to find the network..Initially I thought it was a problem of the network,but hen I found out that others were able to use it..My vista os laptop is able to detect other available networks but not the required one..Then i tried to connect my cell phone to the network and it did easily!! I tried restoring the network settings to default but it showed the network for just 2 mins and it ws back to square one.. I wanted to know can I connect my laptop to the cell using USB and browse internet through that?? I have done it when I used GPRS but am not sure if it cn be done in this situation when the cell is connected toa wifi network..plz help..

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  • Multiple IP's using one NIC connectivity problem - Windows

    - by Vincent
    I have a frame relay network that is directly connected to a GPRS network. I also have a ADSL high speed network and recently I have been trying to achieve the following network configuration using windows 7 (Also tried XP) with no success to date. On one server I have two NIC's NIC1 I would like the following two static IP address's 10.0.1.110 and 10.0.1.200 the cisco router has a default gateway of 10.0.1.1 the ADSL is DHCP. NIC1 and the cisco router do not have access to the internet. NIC2 is setup for DHCP with a primary DNS and secondary DNS configured to enable internet connectivity. With NIC1 all incoming TCP connections are from IP address's starting with 10.192.x.x I cannot establish a TCP connection to both 10.0.1.110 and 10.0.1.200. Its either one or the other. I have a static route implemented in windows of: route -p 10.192.0.0 mask 255.255.0.0 10.0.1.1 metric 1 I have tried leaving out the gateway in the NIC1 and many other combinations with no success. Can anyone please help? What am I doing wrong?

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  • I've inherited a rat's nest of cabling. What now?

    - by hydroparadise
    You know, you see pictures like below and sort of chuckle until you actually have to deal with it. I have just inherited something that looks like the picture below. The culture of the organization does not tolerate down time very well, yet I have been tasked to 'clean it up'. The network functions as it is, and there doesn't seem to be rush to get it done, but I will have to tackle the bear at some point. I get the ugly eye when I mention anything about weekends. So my question goes, is there sort of a structured approach to this problem? My Ideas thus far: Label, Label, Label Make up my patch cables of desired length ahead of time Do each subnet at a time (appears that each subnet are for different physical locations) Replace one cable at a time for each subnet It's easier to get forgiveness than permision?

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  • Epson Artisan 800 on Ubuntu/Linux

    - by Tim Lytle
    Update for Ubuntu 10.04: Printing should work 'out-of-box', scanning still needs the newer sane backend. Looking for a known good way to setup an Epson Artisan 800 on Ubuntu specifically or any linux box in general. It is a printer/scanner with ethernet/wifi/usb. I'd like to use it as a network printer/scanner being able to do both from my Windows and Ubuntu machines; however, if it needs to be physically connected to a computer (preferably the Ubuntu machine) that is doable (again, then sharing print/scan functions to the network). Basically, I'm looking for someone who has used this printer/scanner (or similar) in a multi-platform environment to share how the set it up and how well it worked. Updated: A little more information, like most printers (I expect) the documentation for the printer basically says, "don't use plug-n-play, run our setup CD from your Windows/Mac system", to do anything (set it up for network use even). I guess that's to make it easy for anyone else to setup, but when you're looking to use it with an unsupported (by Epson's documentation) OS, you're just stuck on your own. What I was hoping for was someone who could say, "Forget the bundled software, do [this] to set it up on wifi manually, install [this] to connect to the scanner from [os], printing works with [this] driver - at least that's how I set it up." I'll will (and have so far) use the information here, and post my own setup when I'm done, if there's no one else out there with that experience.

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  • msi netbook refuses to connect to home wireless network (windows xp)

    - by sa125
    Hi - I'm trying to connect my girlfriend's MSI netbook to the wireless network in my house, and failing repeatedly. It's not a hardware issue, b/c it connects to other networks successfully, and, it's not a network issue, because I have another mac and linux laptops that have no problem detecting and connecting to the same network. When I open windows' network connections box, I can see the network available, and when I try to connect to it (using a password), I get a "network no longer in range.." error (the router is 2 ft away). This has been the case for the past 6 months, and I'm about to give up. I've reset the router, erased all saved network preferences and pretty much all I could think of short of re-installing XP. Any idea what else could be done? thanks.

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  • What is a good custom MAC address? [closed]

    - by rausch
    My new notebook has been dropping the WiFi connection infrequently. The reason was, that my PS3 had the same MAC address. I changed the MAC address of my notebook and the WiFi is now stable. At first I just reduced the address' last block by 1, which happened to be the MAC address of another device. I reduced it again and for now it's fine. In order to avoid conflicts in the future, is there an address range that is safe to use for custom/non-vendor MAC addresses?

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  • Windows host MIA on network

    - by andrewbadera
    I've had a machine effectively disappear off my home office network. 192.168.1.100 - Windows 7 laptop (on domain) - problem machine 192.168.1.42 - Windows 2008 server (domain controller) 192.168.1.101 - Windows 7 laptop (guest; not on domain) For some reason I am unable to ping, tracert or remote desktop to 192.168.1.100 from .42 or .101. I can remote between .42 and .101 no problem however. .100 cannot ping nor remote desktop to .42 or .101. Remote Desktop access is enabled on .100. I've opened the firewall rules. I've disabled the firewall domain profile. I've turned the firewall service off entirely. No matter what I do, the .100 host is unreachable by any other host on the network. I'm at my wit's end. Thanks in advance for any debug advice!

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  • Test server on a local network with XAMPP

    - by hopscotch1978
    Hi, I'm not very proficient with networks and could use some help. I've got a Win 7 desktop with XAMPP which acts as my local dev machine. I've configured a virtual host on the desktop which I'm able to access fine. If I'm understanding things correctly, the virtual host uses port 80 (<VirtualHost 127.0.0.1:80>). I've just tried to configure a separate Win XP laptop on the local wireless network to connect to the main desktop for testing purposes. I've added the IP address and virtual host name to my Hosts file on the laptop. My virtual host is imaginatively named "virtualhost1". When I type this into my laptop browser, it connects correctly to the main desktop and I get the XAMPP welcome screen. But I can't seem to get to the actual site, just the XAMPP welcome screen. It kind of jumps the browser to http://virtualhost1/xampp/. I think it's a port issue of some sort but I have no idea how to resolve it. I would get the same XAMPP welcome screen on my desktop if I omitted ":80" from the virtual host declaration. On my main desktop, typing "virtualhost1" to the browser address bar gives me the site correctly, not the XAMPP welcome screen. Help would be appreciated. Thank you.

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  • My DNS cannot resolve an web site address?

    - by ipkiss
    Hello all, Recently, I could not access the webpage bbc.co.uk anymore, while I can access other websites smoothly. Ar first, I though there may be some problem with my laptop. However, if I use my laptop through my company network, I can load the page bbc.co.uk normally. Then, I though maybe my ADSL at home blocks that web address. However, I tried another laptop with my home ADSL and it can load the page bbc.co.uk very fast. Now I do not know what could be the problem. Can anyone tell me please? Thank you.

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  • How to bypass vpn talking to VMWare Guest?

    - by marc esher
    Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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  • How Can I Disable CRL Checks For A Windows 2008 App Using WinHTTP?

    - by Mike B
    I've got a Windows 2008 server with an app that uses WinHTTP for SSL sessions. The server is isolated from the internet but still tries to connect to CRL distribution points, which leads to some timeouts. Since the server has no access to the internet whatsoever, I'd like to disable CRL checks. I had a similar issue on a Windows 2003 server and resolved it by adjusting the following registry keys: HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Http/Parameters/SslBindiongInfo/0.0.0.0:443/DefaultSslCertCheckMode (DWORD=1) HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Rasman/PPP/EAP/13/NoRevocationCheck (DWORD = 1) HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Rasman/PPP/EAP/13/NoRootRevocationCheck (DWORD = 1) That doesn't seem to be working in 2008. I've also tried disabling the CRL check from IE under Tools Internet Options Advanced. Is there anything else I can try here?

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  • pptpd configuration

    - by Ian R.
    I would like a little help on configuring pptp so I can use my server as a vpn server since I have 10 ip's on it and I travel a lot so that would really help me and my partners. I managed to install everything needed but my vpn client fails to connect due to some reason that I cannot understand. I know there are 2 files in pptp that you're supposed to edit so I will post my 2 files here: /etc/ppp/pptpd-options name pptpd refuse-pap refuse-chap refuse-mschap require-mschap-v2 require-mppe-128 proxyarp nodefaultroute lock nobsdcomp /etc/pptpd.conf option /etc/ppp/pptpd-options logwtmp localip xx.158.177.231 remoteip xx.158.177.103,xx.158.177.116,xx.158.177.121,xx.158.177.124,xx.158.177.125,xx.158.177.131,xx.158.177.134,xx.158.177.139,xx.158.177.142,xx.158.177.145 interfaces file eth0 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.231 Bcast:xx.158.177.255 Mask:255.255.254.0 inet6 addr: xx80::216:3eff:fe51:31ba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:56352 errors:0 dropped:0 overruns:0 frame:0 TX packets:3xx15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4884030 (4.8 MB) TX bytes:6780974 (6.7 MB) Interrupt:16 eth0:1 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.103 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:2 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.116 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:3 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.121 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:4 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.124 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:5 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.125 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:6 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.131 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:7 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.134 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:8 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.139 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:9 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.142 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 eth0:10 Link encap:Ethernet HWaddr 00:16:3e:51:31:ba inet addr:xx.158.177.145 Bcast:xx.158.177.255 Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 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:3 errors:0 dropped:0 overruns:0 frame:0 TX packets:3 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:286 (286.0 B) TX bytes:286 (286.0 B)

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  • Network Diagramming software options?

    - by Zak
    I've used The Dude to map my network, but I can only export the network map as a graphics file. I've also used Dia and Vision to manually diagram portions of my network. Does anyone out there have a solution where I can do automatic network mapping using a tool like "The Dude", then pull that file over to a manually editable format for cleaning up and/or enhancing in Visio or Dia?

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  • Network problems with Ubuntu on VMware

    - by svick
    I'm running Ubuntu 10.04 inside VMware Player running under Windows Vista and I can't connect to the internet or the host computer from the Ubuntu. I have set all the VMware services to “manual” (like VMware DHCP Service), but starting them manually doesn't help. In VMware, the network seems to work (there is a green dot beside the network icon) and I have tried both Bridged and NAT settings. ifconfig doesn't show the eth1 interface, unless I give it as a parameter (or use -a). I think this means that Ubuntu thinks that the network isn't connected at all. How do I fix this? ifconvadmin@ubu1004:~$ ifconfig 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:56 errors:0 dropped:0 overruns:0 frame:0 TX packets:56 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4192 (4.1 KB) TX bytes:4192 (4.1 KB) vadmin@ubu1004:~$ ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:0c:29:2d:a0:6f 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:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:18 Base address:0x2000

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  • How to find the real IP to which IPVS is routing a virtual IP

    - by Wayne Conrad
    I'm trying to find a problem server hiding behind a virtual IP (using LVS/ipvs). I've got a test program that sends requests to the virtual IP until it gets the bad response, but how can I tell to which real IP a request to the virtual IP got routed? On the box doing the virtual IP magic, here's the virtual IP configuration (for the service I care about): IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn ... TCP 10.1.0.254:5025 nq -> 10.1.0.5:5025 Route 1 0 1 -> 10.1.0.6:5025 Route 1 0 5 -> 10.1.0.7:5025 Route 1 0 2 -> 10.1.0.9:5025 Local 1 0 3 -> 10.1.0.11:5025 Route 1 0 3 ... My client program is sending TCP requests to 10.1.0.254:5025, usually getting a good response but sometimes a bad response. With this few servers, I could send my request to each server in turn until I discover the culprit, but I wonder if that technique will scale as we add servers. What means exist for me to find out where requests got routed? Kernel: Linux 2.6.32 OS: Debian testing (whatever that's called these days). ipvsadm is version 1.25, compiled with ipvs v1.2.1

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  • OpenVPN/Tunnelblick through wireless router, no connection.

    - by Oscar
    I'm using OpenVPN with Tunneblick on my Macbook Pro to access a server on my job. I't works fine, but i can't get it working with my Netgear WGT624v3 wireless router. I get this warning: WARNING: potential route subnet conflict between local LAN [192.168.1.0/255.255.255.0] and remote VPN [192.168.1.0/255.255.255.0] Someone told me that i should "port forward" on my router, but i can't figure out the right settings. Also not shure i'm doing it right.

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  • Unable to compile netmap on Fedora 32 bit

    - by John Elf
    This is the error everytime I try to install netmap: Can someone let me know how to isntall the same on e1000e or ixgbe. I have kernel header and source installed. [root@localhost e1000]# make KSRC=/usr/src/kernels/2.6.35.6-45.fc14.i686/ make -C /usr/src/kernels/2.6.35.6-45.fc14.i686/ M=/media/sf_Shared/netmap-linux/net/e1000 modules make[1]: Entering directory /usr/src/kernels/2.6.35.6-45.fc14.i686' CC [M] /media/sf_Shared/netmap-linux/net/e1000/e1000_main.o /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c: In function ‘e1000_setup_tx_resources’: /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:1485:2: error: implicit declaration of function ‘vzalloc’ /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:1485:20: warning: assignment makes pointer from integer without a cast /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c: In function ‘e1000_setup_rx_resources’: /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:1680:20: warning: assignment makes pointer from integer without a cast /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c: In function ‘e1000_tx_csum’: /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:2780:2: error: implicit declaration of function ‘skb_checksum_start_offset’ /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c: In function ‘e1000_rx_checksum’: /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:3689:2: error: implicit declaration of function ‘skb_checksum_none_assert’ /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c: In function ‘e1000_restore_vlan’: /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:4617:23: error: ‘VLAN_N_VID’ undeclared (first use in this function) /media/sf_Shared/netmap-linux/net/e1000/e1000_main.c:4617:23: note: each undeclared identifier is reported only once for each function it appears in make[2]: *** [/media/sf_Shared/netmap-linux/net/e1000/e1000_main.o] Error 1 make[1]: *** [_module_/media/sf_Shared/netmap-linux/net/e1000] Error 2 make[1]: Leaving directory/usr/src/kernels/2.6.35.6-45.fc14.i686' make: * [all] Error 2

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