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  • How to connect the virtual networks of vmware guests running on different hosts?

    - by gyrolf
    In a test setup, we are running several virtual machines on a single vmware workstation host. All virtual machines are connected via a "host only" network. This runs fine up to 2 or 3 virtual machines (depending on the host hardware). To allow more virtual machines, we want to use more host machines. Details about the environment and applications: Host PCs are running Windows XP in a corporate intranet. VMware used is Workstation 6.5 Guests are running Windows Server 2003 All guests act as Web Servers One of the guests additionally acts as Windows File server, offering shared folders for the other guests to connect to. Restrictions: VMware guests shall not be visible from the intranet. Changes to the host PC are restricted by corporate policy. In the virtual network, no domain controller exists. All virtual machines are member of the same workgroup. Running the virtual network as NAT is possible. Port forwarding might be used if it does not conflict with ports used by the host PC. Looking for a solution, I found hints about using router or vpn software on the hosts, but without any details how to setup. (I found a similar question Sharing the network between 2 VMware hosts, but the answer was not sufficient for me.)

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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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  • 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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  • 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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  • 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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  • Windows network routing

    - by fabianvilers
    Hi! I'm working by my customer premises and they let me connect my private laptop on a dedicated Wi-Fi for internet access. It's nice for external consultants. The only issue is that we can't connect on a remote server on port 25. I suppose this policy is set up to avoid infected computers sending spam from their network. As you can have guessed, this is something weird that I can't send mail at all. Fortunately, I've a 3G cell phone that I can connect by Bluetooth on my laptop. So when I want to send an e-mail, I have to disconnect from Wi-Fi, connect my phone, send the e-mail, disconnect phone and reconnect Wi-Fi. Kinda overhead. My question is: how can I tell Windows 7 to use the Wi-Fi for every out connection, but if it's a connection on port 25, use the cell phone network? With this solution, I could let my phone connected all day without having to switch again and again. Thanks a lot for your anwwers. Fabian

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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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  • Internet wireless connected with limited access, windows vista

    - by Wawa wiya
    Hello I had some malware in my computer so I did a bit of manual work to remove it including resetting TCP/IP. Now the malware is gone. I can see my home wireless network and I can get connected to it but when connected I get the Internet wireless connected with limited access message. When I go to the IE I cannot browse. When I tried to ping 192.168.1.1 I got an Error Code 1231 Unconnected Network Problem. I have deactivated my Windows firewall as I thought it could be hyperactive security. Still no luck. I have Norton but it is not active, I have also Avast and AVG installed but they are not active. Any ideas?

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  • Find if IP Address is in use

    - by WedTM
    I'm trying to find if an IP address is in use. I don't want to rely on ping, as most of our hosts have ICMP echo and reply turned off. I'm looking for something that mimics window's "IP Address Conflict" detection. (How does this mechanism do it?)

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  • is it possible in this case to get two IPv6 networks to communicate over the IPv4 Internet?

    - by user239167
    I have a setup of a laptop connected to a cellular IPv4 network (3G usb dongle) and PC connected to another IPv4/IPv6 network. Both have been configured to run as IPv6 routers and each has its IPv6 network. The laptop connects to the Internet via the 3G network with IPv4 address (private one and it is mostly changing) on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:444::/64). The PC connects to the Internet via the organization network with both public IPv4 and IPv6 addresses on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:222::/64). Both running Linux Ubuntu. Is it possible to get the two IPv6 network (2001:db8:222::/64 and 2001:db8:444::/64) to communicate over the IPv4 Internet? Is openvpn of any good in this case to get IPv6 traffic over IPv4-IPv4 tunnel? Thanks for helping in advance

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  • Choosing gateway router/firewall for small datacenter network [closed]

    - by rvs
    I'm choosing a gateway router/firewall for small internal network for medium-sized web service. Currently there are 5 servers in internal network, up to 50 http(s) requests/second, up to 1000 simultaneous connections, uplink is 100 Mbit. So, network is relatively small and not very busy and we don't like to buy some pricey monster like cisco or jupiper for this site. Instead we'd like to buy two affordable devices (one for spare), which can handle our workload now and some time in future (it might be up to 2x more in 1 year). I had some experience with Sonicwall NSA, but it seems to be too complex for this site (we don't need most of its features) and even too pricey when buying two of them. So, after some research I've come up with following options: Netgear Prosecure UTM Series (probably UTM25) Zyxel ZyWall Series (USG100 or USG200) Sonicwall TZ 210 Is this a good idea? All of the above seems to be more office products, not datacenter ones. Or we should stick with Sonicwall NSA? Does anyone have any hands-on experience with this models? Maybe some other advices? Thanks.

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  • G4 server running slow

    - by Abby Kach
    I have HP proliant ML 350 servers. We have 8 remote locations where users connect and log on to our server through DYNDNS to access our company ERP's to conduct day to day work. The base of our company ERP's is oracle for which we have a separate server.Now the problem is day by day the load on the server is increasing and the speed is getting slower and slower and users are facing a lot of issues . so I are planning to implement Sonic wall VPN. I conducted a demo of sonic wall but it was slower than the current speed of dyndns. the configuration of my server is as follows :- Linux HP ProLiant 370 Intel Xenon 3.20 GHZ 150 GB (72 * 2) 3 GB Suse Omega HP ProLiant 370 Intel Xenon 3.20 GHZ 300GB (72.8 * 4) Raid 5 4 GB Windows Server 2K3 Enterprise Edition Storage Box HP Storage Works 1400 Intel Xenon 2.00 GHZ 4 TB(1 TB * 4) Raid 5 2 GB Windows Server 2K8 Enterprise Edition Domain & Terminal HP ProLiant 350 Intel Xenon 3.20 GHZ 250 GB(72.8 * 3) Raid 5 4 GB Windows Server 2K3 Enterprise Edition Can some one help me as to how can i speed up my network at remote locations and reduce the problems of speed etc..

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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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  • 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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  • How do I get a 300Mbps connection over 802.11n?

    - by Daniel Schaffer
    I just bought a new wireless setup, consisting of a Cisco E2000 router, Edimax 7718un USB adapter for my laptop and an Edimax 7728in PCI adapter for my HTPC (which isn't in a location I can run cat5 to). I have to stay in the 2.4GHz band because I have an iPhone and a Wii that will need to connect. I'm aware that 11g devices will drop speeds for 11n devices, but they aren't connected yet. The fastest connection I've been able to get, with the router within 5 feet of either the laptop or HTPC is 144Mbps. The router has settings for "20MHz" and "Auto (20 MHz or 40Mhz) channel width, which I've set to the "Auto" setting. I haven't been able to find anything similar for either of the Edimax adapters. This is the first I've dealt with 11n, so I'm not even sure what else could be causing a problem. How do I get up to 300Mbps, or at least a fair bit closer?

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  • What are good and bad jitter times for a LAN

    - by garyb32234234
    Ive just ran jperf (frontend to iperf) on our network between 2 workstations, its recorded jitter between 0.033ms and 0.048ms. Is this good or bad? Are there more variables that i would need to consider to make the decision? EDIT: TCP/IP Ethernet LAN 43 PCs 1 server, 100Mbits main switch, various small 8 port switches, test was done using UDP, Its a Windows Domain. I want to instal a few voip softphones on the workstations, see how many i can use that reliably work, im testing a few different workstations around the network to see where the best quality network paths are. Will also change some equipment if i identify bad connections.

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  • Wireless Disabled:HardBlock

    - by wisdom
    Really I don't know where can I solve my problem.....I'm searching for ages everyone has solved it but me not yet ! It's Wireless HardBlock problem... I posted this question when I was using ubuntu 11.10 on askubuntu and no hope ! here are some solved problems which I tried but mine not solved ! (1,2,3) I'm using now Fedora17 beside Xubuntu where no problem with wireless card ! Anyone can give me hope to solve it ? thanks in advanced

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  • Why are my downloads up to ~1500KByte/sec only, when the ADSL connection locks at 13611Kbit/s?

    - by leladax
    No uploading is going on other than the overhead of downloading which appears to be not high for the abilities of the connection: Only about 30-40KByte/s when the router locks at 1012Kb/s and other direct uploads or uploading overheads can reach more than 100KByte/sec so I don't think it's a congestion at uploading that is doing it. Is there something I miss? Because I assume 13611Kbit/s should be ~1701Kbyte/sec. Is it an overheard at the ADSL level I don't understand? Could it be the ISP doing it? If it's active throttling it can't be on single connections since 2 high speed connections still go up to ~1500KByte/sec. It's not an example on torrents or other complex situations. The tests were on Ethernet, but I doubt the results would be different on wireless. I wonder if the settings of those connections at my end could be doing it, e.g. MTU settings, though I haven't touched the defaults of a common Realtek NIC.

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  • Why can't a PC with 2 network cards be accessed by hostname?

    - by lewis
    I set up PC with 2 network cards, connected to the same LAN. I can connect to this PC (e.g. by remote desktop) only via ip-addresses. Accessing by hostname does not work. Why is this the case? UPDATE: Full environment 1. PC with 2 hardware network adapters. 2. On this PC installed VMWare Workstation. Created 3 VM's, networked by "bridged" network setting in VMWare. 3. In LAN all ip-addresses given from DHCP. 4. Win2k8 on all hosts (both physical and vitrual). As result: 1. PC has 2 ip-address (e.g. 192.168.1.71 and 192.168.1.72). PC available in LAN by ip-addreses, but not avail by hostname. 2. VM's has own ip-addr on each (e.g. 192.168.1.73, *74, *75 etc). They are available from LAN by their ip's, BUT not by their hostnames. How can I access to PC and to VM's by hostname?

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  • Wireshark does not see interfaces (winXP)

    - by bua
    Short story: Wireshark is working....on my winXP-32b ... usage .... Long long time later Wireshark does not work It can't find any usefull interface (just VPN) ipconfig /all Ethernet adapter Wireless Network Connection: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Dell Wireless 1490 Dual Band WLAN Mini-Card Physical Address. . . . . . . . . : SOME VALID MAC Ethernet adapter eth0: Connection-specific DNS Suffix . : xxxx Description . . . . . . . . . . . : Broadcom 440x 10/100 Integrated Controller Physical Address. . . . . . . . . : SOME VALID MAC Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.12.68 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168..... ..... Ethernet adapter Local Area Connection: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Fortinet virtual adapter Physical Address. . . . . . . . . : SOME VALID MAC Following steps didn't help: Several Wireshark re-installation Several LIBPCAP re installation SP3 for winXP Any ideas welcome.

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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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