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  • Using Hamachi VPN to connect to Linux VM at home

    - by Cameron Verotti
    I have a CentOS 5.10 Linux box at home running on VMWare, with Windows 2008 as the host. I have set up a Hamachi VPN so that I can connect to the Host server from work, I attempted to add a second VNIC to the VM and bridged it to the hamachi Network Interface. I spun up the VM and checked eth1 with ifconfig and its throwing me a ipv6 address not a ipv4. I want to hook this VM up so that I can run a ssh command from work to the VM. MY network at home is all on Local 198.168.. hence the need to make a VPN network like Hamachi. I cannot seem to find anything that tells me or helps me with tunneling my Linux VM via Hamachi. Any help would be fantastic!

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  • Prevent Linux from processing incoming ICMP Host unreachable packets

    - by bbc
    I have a test setup with one host on a network (10.1.0.0/16) talking via TCP to another one on another network (10.2.0.0/16) and a gateway in the middle. Sometimes, the TCP connection is lost and while scanning the trace (pcap), I looks like it's because of just one ICMP Host unreachable message sent by the gateway to 10.1.0.1 at some point. 10.1.0.1 then sends a TCP RST to 10.2.0.1. In my opinion, the gateway (pfSense) is broken or not configured correctly but anyway, for testing purposes, I'd like to block this kind of ICMP on the host (10.1.0.1) before it has an influence on my TCP connection (or does it? I'm not even sure). I've tried iptables: iptables -I INPUT -i eth0 -p icmp --icmp-type host-unreachable -j DROP but while it does a good job at preventing userpace applications like ping from receiving these ICMP messages, my TCP connection still comes to an end when the alleged "killer ICMP packet" is sent by the gateway. Am I right about how it is processed? If yes, then what can I do to achieve my goal?

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  • Diagnosing Random Network Lag

    - by uesp
    I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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  • Unable to set initcwnd on a Hetzner server

    - by Sergi
    We just ordered a bunch of Hetzner EX40SSD servers with the minimal Debian install image that they provide and everything is just fine except that looking at tcpdumps for fine tuning the network from various locations the initcwnd param seems to be stuck at 6 no matter how we change it. By default Debian 3.2 kernels should have that setting to 10 so it's pretty strange. Is it possible that the NIC driver or a custom setting in the Hetzner Debian image is limiting this param? Even if we set it to 4, like the old kernel default, it doesn't work. Any ideas would be much appreciated! Does anyone know if the NIC drivers provided by default by Debian have some kind on limitation. In a long thread in http://www.webhostingtalk.com/showthread.php?t=1200617&highlight=hetzner they talk about a page http://wiki.hetzner.de/index.php/Installation_des_r8168-Treibers/en where Hetzner states that the included Realtek r8168 driver is not working properly, but nowhere do they say that the initcwnd could be affected. Tomorrow i will try to install a CentOs image and see if Debian is the problem...Last resort would be to install a custom debian image, but that is a pain in the ass! Thanks!

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  • hybrid cable for QSFP to CX4 convertion

    - by John-ZFS
    here is a hybrid cable for QSFP to CX4. Will this fit SFP+ ports? Deeply confused by standards and struck in a situation with wrong hardware selection!Personally have not seen the ports/hardware and hence the obviously stupid question! thanks for stopping by and bearing with me. http://www.cablesondemand.com/pcategory/72/category/QSFP+-+CX4/URvars/Catalog/Library/InfoManage/QSFP_TO_CX4_COPPER_CABLES.htm

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  • RS-232 vs. RS-485

    - by user60524
    Doing a little research on the two to figure out which one may better suit my purposes (communications amongst different hardware). How do they fare against one another? Im far from being a specialist and have no idea where I would even start looking for data to compare and contrast. If possible can someone please answer the following questions in regards to each of these. Can they be networked amongst each other? Can they be easily networked over ethernet? What speeds do they transfer at? (Min, Max, Etc.) Reliability? Best framework to build on top of to support the above? Any standard communications programs? Debugging capability? Any help would be very much appreciated, thanks.

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  • Can I use CAT 6a connectors with 7a cable (and get 6a performance)?

    - by Mr. Flibble
    I'm re-wiring a building and want to get the best cable possible laid - it required re-plastering to make a change to the cables and the cables will be there for the next 10 - 20 years. Currently there appears to be cat 7a cable available but not too much in the way of cat 7a connectors. Also - I won't be using 40Gig hardware in the near future. So, my question: is it possible to use cat 6a connectors / patch panels with cat 7a cable and get the same performance as I would had I used cat 6a cable? Are there any gotchas in trying to do this?

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  • Domain user cannot connect to Exchange

    - by Jeff
    I can login to the local PC and connect to Exchange server - on the same physical network if i log into the domain i cannot connect to the Exchange server. DNS / DHCP all functioning as expected. User has AD account with Domain Admin rights. Quite confusing!

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  • Uninstalled server 2008 now router won't handle DHCP

    - by john
    My set up is this. server behind router, router has a server and switch connected to it with multiple computers. router used to serve DHCP and DNS, a couple of days ago installed AD, DNS and DHCP on the server, and the server gave out IP's. For various reasons we had to uninstall the domain on our server. I removed AD, DHCP and DNS from the roles and set the router back to serving DHCP and DNS. Now I can't get computers on the network. I reset my router back to factory defaults, and if I plug a computer directly into the router I can get a IP address, but all the computers behind the switch can't get an IP address and can't see the router. All my computers say unidentified network, and if I ping the router it says host is unreachable. On the other hand, my wireless devices are just fine and connect no problem. But for desktops, ipconfig /release doesn't release anything and /renew can't find a server to renew on. My router log shows several FIN scans but they are from innocuous websites (google, netgear) and it shows a couple of smurf attacks but they are all from my external IP. Any ideas? the server isn't even connected to the route right now, and all the computers are set for dynamic IP addresses.. I don't know what else to try? Any help?

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  • Connecting to Aerohive AP's from Laptops running Win. 7 using authentication from a Windows 2008 domain server

    - by user264116
    I have deployed a wireless network using Aerohive access points. 2 of them are set up as radius servers. I want my users to be able to use the same user name and password they use when they log onto our domain. They are able to do this from android devices or computers running Windows 8. It will not work on Windows 7 machines. How do I remedy this situation, keeping in mind that the machines are personal machines not company owned and I will have no way to change their hardware or software.

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  • Enable/disable wireless interface in a bat file

    - by Herms
    Is there a way to enable/disable a wireless network interface via the command line (so I can put it in a bat file)? When I'm in the office I use a wired connection, but Windows still occasionally bugs me about my wireless connection not being connected (even though I turned off the option for notifying me when there's no connectivity). I'm guessing the only way to stop it from bugging me is to disable the interface, but I'd rather not have to go into the network settings every time I need to do so. I'd like to set up a bat file or a shortcut that I can use to enable/disable the wireless (preferably a single one that toggles the current state), and then just set up a keyboard shortcut for that. I just have no idea how to do so from the command line.

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  • Do I need to create static routes for my home network?

    - by SZU
    50.x.x.x assigned by Frontier 192.168.1.1 Actiontec (FiosModem/Router) 192.168.1.2 Voip 192.168.1.3 DLINK/DIR615 (WirelesRouter) 192.168.1.3 assigned by Actiontec 192.168.2.1 DLINK DIR615 (Hardwired to Actiontec) 192.168.2.194 Android 192.168.2.195 Vista-PC1 192.168.2.196 WIN7-PC2 192.168.2.197 Linksys-1 WRT54G/DDWRT(WirelessClient) 192.168.2.198 Linksys-2 WRT54G/DDWRT(WirelessClient) 192.168.2.199 DSi 192.168.2.197 assigned by DLINK 192.168.3.1 Linksys-1 WRT54G/DDWRT 192.168.3.100 Vista-PC3 192.168.2.198 assigned by DLINK 192.168.4.1 Linksys-2 WRT54G/DDWRT 192.168.4.100 Ubuntu-PC4 Above is my current setup. All PCs have Internet access. PC3 and PC4 cannot see each other and PC1/PC2 cannot see PC3/PC4. Do I need static routes between PC3 & PC4, PC1/PC2 & PC3/PC4? If how do I create the static routes?

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  • How can I port forward over a VPN NAT?

    - by Charlie
    I have a multi-site VPN currently running with pfSense boxes and currently using OpenVPN. However I can change the OS and VPN type if need be. The main router has a 10.13.0.0/16 subnet and a series of public IPs For example, a branch has a 10.12.1.0/24 subnet How can I port forward NAT traffic on a public IP of the main router to a server behind the NAT of the second? So for instance port 95 on a public IP assigned to the main router forwards to 10.12.1.102 on the other router. Is this even possible? Currently my setup works great but only for intertnal traffic

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  • Laptop loses signal from WiFi router, but mobile phone holds it fine

    - by Anton
    Hi, I have an extremely weird issue with my WiFi router. Both Ubuntu & Windows 7 can connect to it fine, but after 5-10 minutes browser (any one) stops opening pages and tells me it cannot resolve host address. But, at the same time, tools like Skype or BitTorrent work without any issues. I can also browse Internet on my mobile phone connected to the very same router. If I reset router it helps, but after 5-10 minutes I see just the same problem... Ubuntu tells me that WiFi signal is lost (mobile sees it), Windows 7 just won't let me browse anywhere. Can anyone give me a suggestion on this, please? Thanks

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  • Reliable router with good VPN and WAN Throughput [closed]

    - by Asdande
    I have 2 cisco rv180 VPN router. These routers are giving me lots of problems. The webpages wont load correctly, slow response to load webpages plus other many issues. I have several cases pending with cisco. I give up on these routers. I would like to know if you guys can recommend me a reliable router for our 3 branches (NY - main, SC and FL). In NY- main office, we have 55 users. In SC branch, 6 users. In Florida we only have 1 (will grow soon). I need a router capable of support: 3 VPNs Site-to-Site connection VPN throughput of at least 40-50 Mbps WAN throughput at least 100 Mpbs and up PPTP Server for at least 5 PPTP users Web filtering - all users need access to internet Good Firewall Port forwarding for FTP Server - able to show the public IPs of FTP users (rv180 cannot do that, just shows me router's LAN interface IP, opened a case with cisco, now escaleted to level 2, still no answer or workaround) Dual WAN ports for balance or backup internet. Gigabit WAN/LAN ports Price between $400-$500 range. I was thinking on the TP-LINK TL-ER6120 or TL-ER6020 according to the review on smallnetbuilder.com http://www.smallnetbuilder.com/lanwan/lanwan-reviews/31983-tp-link-tl-er6020-safestream-gigabit-dual-wan-vpn-router-reviewed but I don't want to make another mistake as I did when I bought the cisco RV180. Thank you in advance,

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  • How to analyze a wifi network with many devices

    - by Caveatrob
    My friend has a wifi network with an x-box, a wii, a playstation, and two nintendo portables. She's also got 2-3 PC's and a network printer. She's got a wifi repeater as well. She claims that she didn't have any issues for months with everything working together, and suddenly everything stopped disconnecting. I haven't been over there yet - wanted to figure out the best way to diagnose the thing. I asked her to send me the stats on the booster and the modem, etc: The booster is Netgear serial #2ac2195506b95 The modem is Cisco Linksys e1500 #10910c12129103 We have a sprint router thru centurylink and they said it is working fine 660 series

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  • VPN IPsec site 2 site and static routing

    - by Giacomo
    Hello everybody experts! My question is pretty simple, but I can't figure it out because I'm pretty noob with these network stuffs. I have a vpn IPsec site2site between 2 lan with different ip classes, LAN A is class C and LAN B is class A. The vpn presents the LAN A to LAN B with the 10.178.51.64/27 segment. The problem is that when I start the vpn connection I cant Ping any 10.174.0.0/24 address(LAN B remote segment) from my LAN A; I think I need some kind of static route. Could u help me out pls? Thx Regards

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  • Debian Wheezy, hostapd running but no AP detected by clients

    - by f0o
    I've an TL-WN951N (AR5416+AR5008) using ath9k module running an hostapd and a dhcp for it. So hostapd starts fine: $ hostapd wifi.test Configuration file: wifi.test Using interface int1 with hwaddr f4:ec:38:9b:d4:93 and ssid 'test' hostapd.conf: interface=int1 driver=nl80211 ssid=test channel=1 But nobody seems to find it or being able to see it or connect to it by setting BSSID to 'test'. I'm quite frustrated now, I find 'howto' after 'howto' from people with same chipsets and it always seemed to work out great for them - but not here... iw list even shows up the AP mode being present at the interface... Thanks for your help

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  • Troubleshooting my internet connection

    - by Simon Verbeke
    While I was out of the house, my father rearranged the network cables a bit. I don't know what he has done exactly - He says nothing more then pulling and untangling. When I came back home, my internet connection changed its IP from 192.168.0.205 to 169.254.197.233. The speed changed from 1Gbps to 10Mbps. It has also been at 100Mbps for a while. My subnetmask changed from 255.255.255.0 to 255.255.0.0. The standard gateway changed from 192.168.0.1 to no standard gateway. My DNS servers remain the same. I have checked the lights of the UTP ports, and it looks like it's only sending a heartbeat every few seconds. A sketch of the (relevant part of) the network: My PC ----- extender ----- modem ^ ^ ^ Wired | Wired | This thing connects two cables to each other All the cabling is gigabit, my network card is a Realtek RTL8168C(P)/8111(P) Family PCI-E Gigabit Ethernet NIC (NDIS 6.20). THe modem is a CBN SVG6540E I have no idea what is going on here and I don't know how to find out either. Any help is welcome! If you need any more info, please ask.

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  • Where would an S3 upload speed cap originate?

    - by CoreyH
    I do a ton of uploading to S3 and am experiencing capped speeds and I can't quite figure out how to address it. The setup: Windows Server 2008 R2 x64, external HD, using a Java based upload tool called Jsh3ll and custom VBS scripts to kick the jobs off. Running one process at a time, I am always limited to about 4mbps. I have FiOS at 35/35mbps speeds, so it isn't an outright limit. AND, I can run parallel instances and can go all the way up to 35mbps, so I know the problem isn't gateway/nic/machine/amazon related. Running parallel instances works to a degree as a solution, but increases the complexity of my workflow greatly. Solving this would make my life dramatically easier. When I was first doing this I was playing around with a bunch of Windows TCP parameters and was able to briefly get unconstrained bandwidth, but it wasn't repeatable. Thoughts?

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  • How to know my wireless card has injection enabled?

    - by shrimpy
    I am playing around with aircrack. And was trying to see whether my wireless card on my laptop can pass the injection test And I end up seeing the following... does it mean my wireless card is not able to run aircrack? root@myubuntu:/home/myubuntu# iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"" Nickname:"" Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated Bit Rate:54 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=5/5 Signal level=0 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:781 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 root@myubuntu:/home/myubuntu# aireplay-ng -9 eth1 ioctl(SIOCSIWMODE) failed: Invalid argument ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>' Sysfs injection support was not found either. root@myubuntu:/home/myubuntu#

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  • Any ideas why Ettercap filters aren't seeing packet data?

    - by Bryan
    I'm using an Ettercap filter to detect a query response coming back from a particular service on a remote machine. When I see a response from the service, I'm searching through the data in the packet to see if an offset is a specific value, and if so I'm changing the value at another offset. Trouble is, when I try this on a new virtual machine I built my Ettercap filter's no longer getting any data in the DATA.data variable available to it. if(ip.proto == TCP && tcp.src == 17867) { msg("Response seen!\n"); if(DATA.data + 2 == "\0x01") { msg("Flag detected!\n"); DATA.data + 5 = 0x09; } } The filter's getting applied to the traffic because "Response seen!" messages get printed out by Ettercap. However, "Flag detected!" messages do not. I think DATA.data is indeed empty because if I change my second "if" statement to check for DATA.data == "" then the "Flag detected!" message gets printed. Any ideas why this may be happening?! Also, if this is the wrong site to be asking questions like this, please let me know. I wasn't sure if it fit better here or somewhere like superuser or serverfault. By the way, this is a cross-post from StackOverflow... I should have posted on this forum instead I think. :)

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