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  • OpenVPN to connect remote networks, peer to peer instead of client/server possible?

    - by John Robertson
    I would like to connect two remote networks using OpenVPN. I am very new to this we are very small and don't have a sys/network admin. What are the possible setups to have both networks both live on a common LAN via OpenVPN? I would prefer to use the UDP peer model rather than client/server. Is there a way to set that up instead? I can't see how because no computer on existing network A has a routable address to any computer on existing network B and vice versa.

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  • Can I connect an external antenna to a range extender?

    - by ercan
    I live in a kind of dormitory and the next access point is 60 meters away from my room. So I bought a range extender (TP-Link WA730RE) and installed it into my room in the same height as the access point. But my problem is still not solved. The reception is slightly better but my connection still gets broken every two minutes. The antenna that comes with this range extender was 4dB. My question is, can I buy an 8dB external antenna (like this one: http://www.amazon.com/TP-Link-TL-ANT2408C-Desktop-Omni-Directional-Antenna/dp/B0034CQSKW/ref=sr_1_14?ie=UTF8&qid=1332074993&sr=8-14) and replace it with the antenna that comes with the range extender? Or is this external antenna only suitable for the "receiver" end of the connection, i.e. the computer?

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  • Running docker in VPC and accessing container from another VPC machine

    - by Bogdan Gaza
    I'm having issues while running docker in AWS VPC. Here is my setup: I've got two machines running in VPC: 10.0.100.150 10.0.100.151 both having an elastic IPs assigned to them, both running in the same internet enabled subnet. Let's say I'm running a web server that serves static files in a container on the 10.0.100.150 machine the container: IP: 172.17.0.2 port 8111 is forwarded on the 8111 port on the machine. I'm trying to access the static files from my local machine (or another non-VPC machine also tried an EC2 instance not running in the VPC) and it work flawlessly. If I try to access the files from the other machine (10.0.100.151) it hangs. I'm using wget to pull the files. Tried to debug it with tcpdump and ngrep and that I have seen is that the request reaches the container. If I ngrep on the host machine I see the requests going in but no response going back. If I ngrep on the container I see the requests going in and the response going back. I've tried multiple iptables setups (with postrouting enabled, with manually forwarding ports etc) but no success. Help in any way - even debugging directions would be much appreciated. Thanks!

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  • SSH multi-hop connections with netcat mode proxy

    - by aef
    Since OpenSSH 5.4 there is a new feature called natcat mode, which allows you to bind STDIN and STDOUT of local SSH client to a TCP port accessible through the remote SSH server. This mode is enabled by simply calling ssh -W [HOST]:[PORT] Theoretically this should be ideal for use in the ProxyCommand setting in per-host SSH configurations, which was previously often used with the nc (netcat) command. ProxyCommand allows you to configure a machine as proxy between you local machine and the target SSH server, for example if the target SSH server is hidden behind a firewall. The problem now is, that instead of working, it throws a cryptic error message in my face: Bad packet length 1397966893. Disconnecting: Packet corrupt Here is an excerpt from my ~/.ssh/config: Host * Protocol 2 ControlMaster auto ControlPath ~/.ssh/cm_socket/%r@%h:%p ControlPersist 4h Host proxy-host proxy-host.my-domain.tld HostName proxy-host.my-domain.tld ForwardAgent yes Host target-server target-server.my-domain.tld HostName target-server.my-domain.tld ProxyCommand ssh -W %h:%p proxy-host ForwardAgent yes As you can see here, I'm using the ControlMaster feature so I don't have to open more than one SSH connection per-host. The client machine I tested this with is an Ubuntu 11.10 (x86_64) and both proxy-host and target-server are Debian Wheezy Beta 3 (x86_64) machines. The error happens when I call ssh target-server. When I call it with the -v flag, here is what I get additionally: OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011 debug1: Reading configuration data /home/aef/.ssh/config debug1: Applying options for * debug1: Applying options for target-server.my-domain.tld debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: auto-mux: Trying existing master debug1: Control socket "/home/aef/.ssh/cm_socket/[email protected]:22" does not exist debug1: Executing proxy command: exec ssh -W target-server.my-domain.tld:22 proxy-host.my-domain.tld debug1: identity file /home/aef/.ssh/id_rsa type -1 debug1: identity file /home/aef/.ssh/id_rsa-cert type -1 debug1: identity file /home/aef/.ssh/id_dsa type -1 debug1: identity file /home/aef/.ssh/id_dsa-cert type -1 debug1: identity file /home/aef/.ssh/id_ecdsa type -1 debug1: identity file /home/aef/.ssh/id_ecdsa-cert type -1 debug1: permanently_drop_suid: 1000 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-3 debug1: match: OpenSSH_6.0p1 Debian-3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-7ubuntu1 debug1: SSH2_MSG_KEXINIT sent Bad packet length 1397966893. Disconnecting: Packet corrupt

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  • Reserve internet connection.

    - by amouniverso
    I have the router D-link 804HV that have 20mbit\s internet via PPoE tunnel . It connect three PC with Windows Xp to my home net. One of three my PC have reserve stability wi-fi internet connection. How can I use the wi-fi connection as reserve if the router connection is not available? I try to set the Wi-fi PC as gate for the other two, but it's not working.

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  • Why is it a bad idea to use multiple NAT layers or is it?

    - by iamrohitbanga
    The computer network of an organization has a NAT with 192.168/16 IP address range. There is a department with a server that has an IP address 192.168.x.y and this server handles hosts of this department with another NAT with the IP address range 172.16/16. Thus there are 2 layers of NAT. Why don't they have subnetting instead. This would allow easy routing. I feel multiple layers of NAT can cause performance losses. Could you please help me compare the two design strategies.

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  • triple duplicate acknowledgement in TCP congestion control

    - by Salvador Dali
    If this doesn't belong here, please tell me where is an appropriate place for such question. I am trying to understand ideas behind tcp congestion control mechanisms, and I am failing to understand why we need triple duplicate acknowledgement to trigger window change. In my opinion, double duplicate acknowledgement will be enough to get that the previous package is lost. So why we need the third ack?

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  • udhcpc doesn't assign ip address

    - by Diab
    i have a board running linux 2.6.28 and i have one Ethernet interface (eth0) i want dhcp to assign dynamic ip to this interface. i have busybox with udhcpc in the file system and the kernel has the "Pack Socket" enabled so i copied the scripts from "busybox-1.14.1/examples/udhcp" to my board on "/etc/udhcpc/" (i created this directory) and when i run : ifconfig eth0 up the interface is up but without ip address, then running udhcpc -i eth0 -s /etc/udhcpc/sample.script i get the following: note : sample.script contains : "exec /etc/udhcpc/sample.$1" # udhcpc -i eth0 -s /etc/udhcpc/sample.script udhcpc (v1.14.1) started Sending discover... Sending select for 192.168.10.198... Lease of 192.168.10.198 obtained, lease time 691200 but when i check with ifconfig i can see that it didn't assign the ip address to eth0. anyone have an idea why udhcpc didn't assign the ip ? Thanx

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  • IPv6 - Public IPs, private IPs, IPs derived from the MAC address? Confused!

    - by sinni800
    I'm pretty much excited for IPv6 because of the large address room and (potential?) owning of more than one IP, or even tens of IPs (/122 subnet?) Though one magazine has now confused me. In a current issue (no. 3) of "CT", a German computer magazine, I read that when using IPv6 your IP address consists of your MAC address and various other things, and that this address will be public on the web, no matter what access point / LAN you connect to. My knowledge of IP(v6) is in contrary of this. I thought you will normally always have a a local network IP and NAT takes care of your Internet access, and your provider gives the NAT router an IP. I've heard of the 6to4 interface, but does this one give you your own ip in the IPv6 net? Personally I hope it still is through a personal IP space (like 192.168, 127.16-31, 10. in IPv4) in private networks with a NAT going to the Internet. And also I hope that providers will offer subnets to private customers so they don't have to use NAT anymore. Yay for converting your LAN into the WAN and using better security (so Computers from the same subnet still get access rights like normal).

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  • Configuring https access on HP A5120 Switch

    - by GerryEgan
    I am trying to configure HTTPS management on a HP a5120 switch running Version 5.20.99, Release 2215 and not having much luck. I have followed the manual by creating an SSL policy first and then enabling the HTTPS server with the SSL policy: ssl server-policy sslpol ip https ssl-server-policy sslpol ip https enable When I try and log onto the switch with Google Chrome I get the following error: Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error. When I look this up I have found references to errors due to TLS being used in SSL. I can find no way to specify the SSL version in the server policy. The manual has a configuration example that uses MSCEP to retrieve a certificate but in Windows 2008 R2 that feature is only available in Enterprise and Datacentre editions which I don't have. I have SSH configured and it is using a locally generated certificate so I'm not sure if I can use that but I'd like to if possible. Has anybody been able to setup HTTPS management on HP A series switches without MSCEP? Any and all help appreciated! here is a copy of my config with the interfaces removed: version 5.20.99, Release 2215 # sysname MYSYSNAME # irf domain 10 irf mac-address persistent timer irf auto-update enable undo irf link-delay # domain default enable system # telnet server enable # vlan 1 # vlan 100 description Management # radius scheme system primary authentication 127.0.0.1 1645 primary accounting 127.0.0.1 1646 user-name-format without-domain # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher authorization-attribute level 3 service-type ssh telnet terminal service-type web # stp enable # ssl server-policy sslpol pki-domain MYDOMAIN # interface NULL0 # interface Vlan-interface199 ip address 192.168.199.140 255.255.255.0 # interface GigabitEthernet1/0/1 poe enable stp edged-port enable # interface Ten-GigabitEthernet2/1/2 # dhcp-snooping # ntp-service unicast-server 192.168.1.71 # ssh server enable # ip https ssl-server-policy sslpol ip https enable # load xml-configuration # user-interface aux 0 1 user-interface vty 0 15 authentication-mode scheme

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  • WLAN LED randomly blinking when there is no traffic

    - by mrc
    Hi, I've got a Linksys WUSB54GC WLAN USB interface (Ralink chipset) and I'm running Debian GNU/Linux 6.0. The LED very often randomly blinks although there is no traffic in the network. I checked this with Wireshark. Sometimes, but rarely, the LED stops blinking. The issue is present in Ubuntu and Fedora too. It was not present in Debian Lenny with Linux 2.6.28. I checked an old live cd with ubuntu 8.10 with kernel 2.6.27 and it was also OK. So I guess that's an issue with Linux kernel and its wireless driver or firmware. Has anybody observed a similar thing? Does anybody know how to help this annoying blinking? Thanks.

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  • Internet keeps getting Disconnected & Reconnected

    - by Paul
    I have an Internet connection thru a Phone company which uses DSL modem to connect. For past few weeks my net connection keeps getting disconnected for few seconds & it reconnects automatically. I asked the service provider & they checked & even replaced some wires but of no help. Funny thing is that sometimes there seems to be a rhythm where it disconnects for an average of 13 seconds or so plus or minus few seconds, for hours at a time. I don't know how to attach an image to this post where it shows the pattern of connect & disconnect. I have taken an image using snagit to show the timing pattern. If someone can explain it, I can attach it here. Thanks

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  • Listing the routing table takes long time to complete

    - by Rafal Rawicki
    When I print routes defined on my computer using route, it takes about 5 to 20 seconds to complete. Why does it take so much time? With VPN enabled: $ time sudo route Kernel IP routing table (...) real 0m21.423s user 0m0.000s sys 0m0.012s With no VPN, this is about 5 seconds - still, computer can do a lot in this time. I've repeated my measurements few times, getting very similar results each try. My machine is Ubuntu with 3.0.0 kernel, but as far as I know, route on the other computers works the same way.

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  • Problem with network after malware attack

    - by Cruelio
    Im trying to help some friends with a Win XP machine. I got rid of the malware using Malware Bytes, and HiJackThis. But now they(I) have another problem. When the computer boot into Windows it seems fine. When I start Internet Explorer the browser window opens just fine, but nothing happens for at minute or two. After the two minutes of waiting, the network icon appears in the taskbar next to the clock, and then everything works. The computer is connected to the internet using a Ethernet adapter. I have looked at the Rvent Log and found an error from Perfnet with eventid 2004 <Provider Name="PerfNet" /> <EventID Qualifiers="49152">2004</EventID> <Level>2</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> What I have tried so far: In the device manager i have uninstalled the Ethernet adapter and installed it again. I have uninstalled and installed the Windows File and Printer Sharing service. I have verified that both server and workstation services are started. What should I do next?

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  • Automatic layout of manual network mapping

    - by Paul
    So I have a small business network mainly consisting of two routed layer-2 domains with a total of ca. 100 devices spread over ca. 2000m² production and office spaces. Typical problems to solve using the graph would be: Over what (cable) path is a PC connected to the server? Where to expect devices connected to a switch port? I want to generate a graph of the physical network topology: Nodes are endpoint devices, switch ports, wall outlets, patch panel ports etc. Edges are cable connections. Ideally, grouping edges (or segments) that pass through the same bundle could be grouped. Also I would like to augment the graph data with automatically gathered data (monitoring state, MAC address, Switch port <- MAC entries to build up parts of the map). At the moment I use graphviz for this inside a Confluence wiki like that: layout = "neato" overlap = scale subgraph { rankdir = "TB" subgraph cluster_r1pf1 { r1pf1 [label="{ Rack 1 PF 1 | { <p1>P1 | <p2>P2 | <p3>P3} }", shape=record] } subgraph cluster_switch1 { switch1 [label="{ Rack 1 Switch 1 | { <p1> P1 | <p1> P1 | <p3> P3} }", shape=record] } r1pf1:p1 -> switch1:p1 (obviously there are dozens of entries omitted here) Problem is: I have a hard time to influence graphviz to generate a bearable layout. Edges overlap so bad that you can't read the diagram anymore. The question is: What other tools (be it interactive like Visio, Omnigraffle or I/O-oriented like graphviz) exist that would allow an easily versionable (as in: Operates on a text file) documentation that is both machine and human readable and editable? Why not OmniGraffle or Visio? Well we don't have Macs and Visio is not available at the moment. To buy it I would need good arguments. Automation would be one of that. But last time I looked, versioning Visio files or even thinking about automatic handling was a nightmare. Related: Network Mapping Tools basically asks the same with a focus on generating the complete graph automatically (but without the need to document cabling connections) Recommendations for automatic computer inventory brings up links of "all-in-one" solutions

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  • dlink arp spoofing prevention

    - by Wiploo
    someone can help me understanding arp spoofing prevention on dlink dgs-3100 (ftp://ftp2.dlink.com/PRODUCTS/DGS-3100-48P/REVA/DGS-3100-48P_MANUAL_3.60_EN.PDF). I'd like to protect my gateway MAC/IP from spoofing so I'have tryed to add a rule "IP: 192.168.1.1 MAC: aa-aa-aa-aa-aa-aa" flagging all the port of the switch as untrusted. When I apply the rule I lose connection to all pc attached to the switch. I certanly made some errors, but I can't understand what is wrong. Best Regards

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  • Howto monitor traffic between IIS and MSSQL

    - by kockiren
    Hello @all, i try to check how much traffic flows between MSSQL Server and IIS Server in different Locations. There are 1 ipcop in every Location and i download the tcpdump file from one Firewall and search for DST=ipmssql and SRC=ipIIS but i did not find the ip from the Database Server. But there are traffic between both. Any suggestions why i did not find the IP Adress from the MSSQL Server? Is this an configuration failure in IPCop or is the Traffic between ISS and MSSQL so strange :-) Regards Rene

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  • Router block some sites

    - by Mahesha999
    Hi I was using ADSL Modem/Router earlier. The device is quite old Pronet PN-ADSL 101 E/U model (pics: http://bit.ly/P2YaWy, http://bit.ly/OA700l) Since it had only one RJ45 out, I bought new Wireless Router TPLink TL-WR941ND. It has 4 RJ45 out and 3 wireless antennas. I configured my old router in bridge. Now, if I have to connect my pc to Internet through the old router, I have to enter username and password. Then I connected the RJ45 output of old router to the WAN in of new router. and ran the CD of new router. It configured the new router in PPPoE by saving the username and password in router to dial automatically. So now I have to just plug in the wires in my new routers any RJ45 out. I am able to access the Internet when I connect through new router (both wired and wirelessly), but some sites are getting blocked. Most notably yahoo.com (though ymail.com is working), Microsoft.com. msn.com. These sites work perfectly fine when I connect my pc directly to my old router and enter username and password manually. (However others like google.com. facebook.com works fine when connect through new router) So here these some sites need some parameter set but I am unable to find them out. Can anyone help me. My friend said he also faced same problem. Surprisingly he advised me to see if the same websites will work through Opera turbo mode and boom they worked. So what could be the problem?

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  • Resolve linux hostname in windows

    - by Martin Giffy D'Souza
    Hi, I have a simple home network with Windows 7 machines and Linux machines (Fedora 12 and 13). I'd like to be able to resolve the Linux machine names from the windows machine. For example: -- Windows 7 ping mylinuxmachine Currently this does not resolve. Any ideas? Thank you, Martin

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  • Arch Linux drops me on my school network

    - by Kravlin
    I'm running a Lenovo X61 which i carry around my college for getting on the internet at various points in the day. The network has always been finicky but recently it's gotten worse. I'll connect using iwconfig, get an ip from dhcpcd and log in using vpnc to their system. Sometimes I'll stay connected for hours but most of the time within 30 seconds my network traffic will drop to zero and i'll be unable to do anything. My computer still belives it's connected, however to try again i need to put my wireless interface down, put it back up and try again. It's gotten so bad that i've got a window on my computer pinging yahoo or google constantly in order to know if i'm still able to get online. I know other people who have used Arch Linux that don't have the same problems as well as people who use Ubuntu who haven't had any problems either. It seems like my computer is a special case. Does anyone have any suggestions on how to fix it? dmesg doesn't show anything out of the ordinary going on and i don't know where else to look for errors or other things to try. Edit: this doesn't happen on my home network. It's a problem that only happens at school.

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  • Routing RFC1918 addresses through dd-wrt via a switch

    - by espenfjo
    I am a bit stuck with an experiment of mine. I have a network looking somewhat like this. | Internet | | ---- |Switch| ---- | | Server w/pub IP | DD-WRT router 192.168.1.1 | | RFC1918 clients 192.168.1.0/24 What I want is for the RFC1918 clients to speak directly with each others. On the server with the public IP I have this route: 192.168.1.0/24 dev eth0 scope link and can see that packets are infact reaching the dd-wrt router for 192.168.1.1, even though if I get no answer. Trying to reach one of the RFC1918 clients from the public IP server will get no result, as the dd-wrt router is not announcing that network on to its external interface (arp who-has 192.168.1.107 tell xxx.xxx.xxx.xxx, but no answer). The router being an WLAN dd-wrt router has of course a load of routes, VLANs and interfaces: xxx.xxx.xxx.1 dev vlan2 scope link 192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.244 84.215.64.0/18 dev vlan2 proto kernel scope link src xxx.xxx.xxx.xxx 169.254.0.0/16 dev br0 proto kernel scope link src 169.254.255.1 127.0.0.0/8 dev lo scope link 0.0.0.0 via xxx.xxx.xxx.1 dev vlan2 xxx.xxx.xxx.xxx being the public IP, and xxx.xxx.xxx.1 being the default route for the public IP. I am not sure where to continue with this. I would recon that I both need routing on the dd-wrt router, as well as some iptables magic? Why do something this complex? Why not ;) Also, do not mind that "Internet" can get RFC1918 traffic, it wont go outside of the walls. EDIT 1: Following the tip from stew I do indeed get the correct ARP flowing. And adding an iptables rule for allowing traffic from that specific public IPd machine I get traffic between the systems! Oddly enough though, the speed I get from Server w/pub IP - RFC1918 clients are the same as if the traffic were routed out onto the Internet and back. Edit 2: Ok, disconnecting the external Internet connection will still give the same, crappy transfer speed. So it has to be something else. Edit 3: Ok, I guess there are other reasons for this crappy speed. Case closed. :)

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  • Mikrotik server networks and Cain & Abel

    - by user269742
    I'm connected to the internet via a mikrotik server network. Recently, I read about that scaring application named Cain & Abel and all the capabilities it offered for malicious users. I don't know if anyone on my network is using or even aware of such application but my questions are: 1- How to protect myself from this program? 2- How to know if someone using such application against me? 3- Is Tor Bundle capable of protecting me from Cain & Abel? 4- If I filled my e-mail password via SSL page, Can Cain & Abel collect it? 5- Is it safe to use SKYPE or Yahoo Messenger voice chat if some one using Cain & Abel on my network?

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  • Have Ubuntu auto-connect to wireless AP without logging in

    - by dragonmantank
    We have an ubuntu box set up to do some monitoring but due to the placement are unable to run CAT5 to the box itself. I have an Atheros PCI card that works great as long as someone is logged into Gnome and it doesn't disconnect from the AP during that time. Is there a way to have Ubuntu connect to the AP during boot, and always reconnect if it finds a signal from a specified AP? The box would have a static IP and only connecting to a specific AP using WEP.

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  • Windows 7 fails to connect to the internet a few minutes after startup

    - by SageTheGreat
    Problem Earlier today, when I turned on my desktop computer, my internet connection works fine. Cryptocurrency miners connecting and hashing as usual and I can browse websites. But after a few minutes, my miner fails indicating that there is something wrong with my internet connection. Tried refreshing my browser and is stuck at "resolving host", and then presented me an error. After that, i can't browse sites anymore. But the weird thing is that the network icon in Windows 7 shows no signs of problems. Solutions Made Restarted my computer without doing anything: Problem persists. Tried using the network troubleshooter of windows: Reported no problems Stopped bonjour still no progress. Loaded windows using Last good config: still no progress. Restarted Modem: No change. Current Status I currently did a system restore to my system to a point before installing the latest update from Microsoft. Because earlier today, I installed some updates and after that, the problem started to appear. (After system restore, same problem.) Latest Programs installed before the problem MS Visual Studio 2013 (but internet still worked fine after the install). I hope someone could provide answers on this problem. It is my first time encountering this. EDIT: Additional Info OS: Windows 7 SP1 64-bit AV: Avast Free Antivirus Internet Connection Type: Ethernet It appears that my Laptop can't even connect to the machine thru Remote Desktop My laptop and phone on WiFi works fine and can connect to the internet. EDIT 2: Whenever I boot into Safe Mode, my Internet is fine.

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