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• Likeliness of obtaining same IP address after restarting a router

  - by ?affael

  My actual objective is to simulate logged IPs of web-site users who are all assumed to use dynamically assigned IPs. There will be two kinds of users: good users who only change IP when the ISP assignes a new one bad users who will restart their router to obtain a new IP So what I would like to understand is what assignment mechanics are usually at work here deciding from what pool of IPs one is chosen and whether the probability is uniformly distributed. I know there is no definite and global answer as this process can be adjusted be the ISP but maybe there is something like a technological frame and common process that allows some plausible assumptions. UPDATE: A bad user will restart the router as often as possible if necessary. So here the central question is how many IP changes on average are necessary to end up with a previously used IP.

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• Setting up virtualbox for outside access

  - by Morgan Green

  I have a computer running a server that my subdomain on my shared hosting account points to. IE subdomain.mydomain.org goes to my home server. Now then; what I'm wanting to do is be able to access my VirtualBox servers through that subdomain and a different port. E.G Ubuntu Virtual Box Server 1 Username:Ubuntuhost1 Password:MyUbuntuHost1 Port:4000 Internal IP: 192.168.1.60 External IP: 24.29.138.45 Ubuntu Virtual Box Server 2 Username:UbuntuHost2 Password:MyUbuntuHost2 Port:4001 Internal IP: 192.168.1.61 External IP: 24.29.138.45 Now I want to be able to access RDP number 1 through Port 4000, but if I access Port 4001 it will connect to the server on port 4001; both using the same subdomain. The next issue is the fact that even though I know what the IP addresses are on the router for the virtualbox hosts through ifconfig it doesn't change the fact that they don't show up on the router. If anyone knows how to configure this to work please help me out because I've been racking my brain to the highest extent I can. Alright; here's an edit to clarify more; Sorry. My ports on the router are edited to forward Port 4000 on Internal IP 192.168.1.63 (My Ubuntu Internal IP address) Now when I go to my Router Home Page my VirtualBox Internal IP Address doesn't show on the attached device listings, so I set up port forwarding anyways to the VirtualBox Internal IP. My end goal is when I connect to mydomain.org and I connect through port 3389 it takes me to my host computers server, but if I put in mydomain.org and go through port 4000 it's going to redirect to my VirtualBox server; Is this even possible? Sorry; I'm trying to clarify the most I think I can I just don't know how else to explain my issue.

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• Simulating network latency for localhost connection on Windows 7

  - by nitro2k01

  I need to simulate network latency to a program running on the local computer, connecting to a local service. Thus far I have tried dummynet (a windows build of ipfw) which I got working after some trial and error. While it generally works, I can't seem to get it to filter localhost traffic. Even after adding a rule from any to any which affects external traffic, this makes no difference for local connections. I would appreciate if anyone knows how to simulate local latency using dummynet or a different tool. The tool should be able to simulate latency generically in IP packets, (TCP and UDP) and not be protocol specific.

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• MBPro, mid 2010 can't see Dlink DIR655 signal after sleep etc

  - by user88114

  This is my son's MBP 7,1 running Snow Leopard 10.6.7. Router signal is fine since iPad, Wintel on same table 20 feet from router are fine. the MBP however frequently wakes and fails to find the internet. iStumbler can see 1 neighbours hub and my garden hub are there but can't get to the normal DIR655 wifi... no ping no en0 or en1 device seems to exist. Airport off and on does not help. He just resets router and it all works but this does not please me! I must admit the winter sometimes seems to loose connect too, but less so. The DIR655 (hardware rev A3) is on the original EU firmware 1.10, I'm cautious about jumping to latest 1.31EU since no downgrade seems to be possible and that feels a bit risky as so much is set up and working fine. If I use the DIR655 admin web and release the lease the MBP has then wake it all worked OK. So I suspect lease timing/locking issue but unsure how to check up, plus why iStumbler seems to say the network is not visible at all when I sit on the iPad right next to it just fine.. I do not think there are any channel overlaps and we also have RFquiet DECT phones (Orchid) that are silent until lifted or called. Anyway signals all show low interference and high throughput except for this failure to connect. Just walked the MBP to the garden office and iStumbler now sees the more distant DIR655 signal although it will not connect to it (does not show under Sys Prefs NetNetwork names) even after airport off & on... It also refuses to connect to my garden network (an old Belkin acting as AP wired to DIR655), the signal it can see and even net name in Sys Prefs NetNetwork names (2 mins later):NOW both names ARE visible, but both fail to accept the correct WPA2 password and keep asking again after failing to connect. IT ALL MAKES NO SENSE TO ME. Just revoked the lease for the MBP on DIR655 and no changes although this seemed to help MBP wake into connection 1 hour ago. OK a bit of walking about to report. Carried MBP across garden towards DIR655, a few other wifis show up on iStumbler, low signals all channel 1. Right next to DIR655 but iStumbler not showing it, although most other wifi's have gone. I'd say iStubler is suffering timeouts&hangs but hard to be sure. Lots of attempts to Airport on/off, join other etc and suddenly I get to connect, get given new IP (I revoked), can browse. Walk away, connection drops quite soon at 30 feet then reconnected briefly then died again. MUST ATTEND ELSEWHERE FOR A BIT...

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• Port knocking via SSH tunnels

  - by j0ker

  I have a server running in my university's internal network. There is only one SSH daemon running which is secured by port knocking with knockd. Works fine if I try to connect from within the internal network. But since the server has no external IP, I have to tunnel into the internal network every time I want to access the server from outside. And since tunneling only works for a single port I cannot do the port knocking as easily as from an internal client. In fact, I don't get it to work at all. What I'm trying is opening tunnels for all the different ports that have to be knocked. Then I send TCP-SYN packets into the tunnels. But that doesn't work even for a single port. If I establish the tunnel on the first port in the knock sequence and send a packet through it, it doesn't reach the server. There is no entry in the log file of knockd, while there should be something like 123.45.67.89: openSSH: Stage 1 (as shown with internal knocks). So I guess, the problem doesn't exist within my knocking script but is a more general one. Are there any known problems with what I'm trying to do? Is it even possible or am I missing something? Thanks in advance!

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• hosts file for ip address

  - by Jon Clegg

  I would like to map ip address to specific localhost interfaces (e.g. 23.45.66.77 = 127.0.3.3). For named hosts I can use the hosts file. Naturally this doesn't work for IP address. This has to work in windows, the only option I've found so far is implementing a TAP/TUN driver like openvpn does. Are there any other options?

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• Will a 2.4Ghz WAP intefere with a 5.0Ghz WAP if placed directly next to each other

  - by Dan

  This is mostly a curiosity question to people who know more about radio and wi-fi than I. The 2.4Ghz band is massively overpopulated near my house to the point of sometimes getting 1000ms pings to the router from only a few feet away. inSSIDer finds at least 10 broadcasting SSID's within around 15 seconds of starting, so this isn't a real surprise to me! Sometimes I can get good results by changing the channel to something like 3 or 8, but it's usually temporary as the others use Auto Channel and hop around. Now, the router I have is capable of 5.0Ghz, as is the laptop I type this on. Switching to 5.0Ghz gives superb results: I can download at ~90Mbps and get consistent 1ms pings. The problem is that only this laptop supports 5.0Ghz! My question: Would I still get decent 5.0Ghz performance if I place a 2.4Ghz access point directly next to my router? And, indeed, will 2.4Ghz continue working as 'normal'? Testing would be an obvious step, but I threw all my superfluous equipment out in a recent house move. My understanding is that I should get good performance, certainly in comparison to having two devices using the same frequency range, but I do believe there will be some impact by the virtue of them being directly next to each other. (Cabling is not an option due to it being a rented house)

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• Unexpected network traffic?

  - by robwalker

  My internet connection is via a fixed wireless connection using a 900MHz Motorola Canopy module. The router reports a fairly consistent 32-64Kbps of incoming traffic on the WAN port. When I attached a PC directly to the port and run Wireshark, I get a dump showing a lot of chatter from other machines that I presume are connected to the same tower. This didn't include end-to-end traffic, but was there were a lot of ARP requests, SSDP traffic, ICMP and other network discovery type stuff. Is this 'normal' or does it suggest a misconfiguration somewhere? As far as I can tell there is no need for my modem to be receiving any of this traffic (other than wanting to know what the names of my neighbours machines and printers are!) Since the internet connection is slow at the best of time, having this amount of background noise seems very wasteful.

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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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• OpenVZ multiple networks on CTs

  - by user6733

  I have Hardware Node (HN) which has 2 physical interfaces (eth0, eth1). I'm playing with OpenVZ and want to let my containers (CTs) have access to both of those interfaces. I'm using basic configuration - venet. CTs are fine to access eth0 (public interface). But I can't get CTs to get access to eth1 (private network). I tried: # on HN vzctl set 101 --ipadd 192.168.1.101 --save vzctl enter 101 ping 192.168.1.2 # no response here ifconfig # on CT returns lo (127.0.0.1), venet0 (127.0.0.1), venet0:0 (95.168.xxx.xxx), venet0:1 (192.168.1.101) I believe that the main problem is that all packets flows through eth0 on HN (figured out using tcpdump). So the problem might be in routes on HN. Or is my logic here all wrong? I just need access to both interfaces (networks) on HN from CTs. Nothing complicated.

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• Is it possible to change an "Unidentified Network" into a "Home" or "Work" network on Windows 7

  - by Rhys

  I have a problem with Windows 7 RC (7100). I frequently use a crossover network cable on WinXP with static IP addresses to connect to various industrial devices (e.g. robots, pumps, valves or even other Windows PCs) that have Ethernet network ports. When I do this on Windows 7, the network connection is classed as an "Unidentified Network" in Networks and Sharing Center and the public firewall profile is enforced by Windows. I do not want to change the public profile and would prefer to use the Home or Work profile instead. For other networks like Home and Work I'm able to click on them and change the classification. This is not available for unidentified networks. My questions are these:- Is there a way to manual override the "Unidentified Network" classification? What tests are performed on the network that fail, therefore classifying it as an "Unidentified Network" By googling (hitting mainly vista issues) it seems that you need to ensure that the default gateway is not 0.0.0.0. I've done this. I've also tried to remove IPv6 but this does not seem possible on Windows 7.

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• How do I set or remove a Windows SMB password?

  - by David Is Not Here

  I recently purchased a computer with the intention of using it as network-attached storage. It presently has no Windows password and only one account. Can I create two different shares (share two different folders) in different ways -- make one publicly accessible, and make another only visible to people with a certain username/password combination? Creating multiple users isn't a problem, I just can't figure out where to start within Windows.

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• Brocade 200E Switch - Fibre Channel

  - by Arthor

  What I have: Fujitsu-Siemens PRIMERGY BX600 Brocade 200E (16 port, 4gbit fibre). My question: Imagine a QNAP with a fiber 10GBIT card connected to the Brocade 200E (16 port, 4gbit fibre). Would this work; would the card drop down to 4GBIT? Are 10GBIT fiber cards backwards completable. Update. I have the specs of my server now.... Fujitsu-Siemens PRIMERGY BX600 S3 Blade Ecosystem Blade Chassis comprising; 2 x A3C40073243 Blade Management modules 2 x A3C40089238 GBE Switch Blade SB9F 30/12 2 x A3C40085736 4Gb 10 port pass through blades 1 x A3C40083767 Digital KVM Modules 2 x A3C40073245 Fan enclosures + cooling fans 4 x A3C40073262 Power Supplies My Goals and Objectives To have a blade system in place for 8 blades for video rendering, the other 2 for database and scripts etc The system will be built on VMWARE ESXi 5 Use ISCSI on the QNAP to support HA and vmotion if needed Users to access the qnap for video editing QANAP has 12 drive (2 x (6 HDD in RAID 10)

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• Copying between 2 network devices

  - by Dave Rook

  My network has 3 devices - 1 PC and 2 other network devices (which could be PC, NAS, external hard drive etc) If I want to copy data from one network device to another network device from my PC (using the copy and paste method (i.e right click a file, select copy and then right click into the destination folder and click paste) and therefore not using any tools that could be built into the network devices for such a transaction), does the data get routed via my PC or use my systems resources?

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• Unable to access certain websites from a computer

  - by matt74tm

  One of the desktop computers in my office is unable to access some particular websites. We've tried from Chrome, IE, Firefox, but no luck. eg: http://spsims.wto.org/ -> click on "Regular notifications" On the affected computer, every browser times out after the click. Whereas it should redirect the user to http://spsims.wto.org/web/pages/search/notification/regular/Search.aspx How can I diagnose this further? This is a Windows XP machine.

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• Advise on a 240,000 sqft outdoor wireless network

  - by whlspacedude

  I would be very appreciative of some advice in the purchase of equipment to provide a wireless network that covers the entire area of an outdoor arena. The area is rectangular-ish in shape. 400ft wide and 600ft long. It has 6 light towers, 1 on each of the 400 foot ends and 2 on each of the 600 foot ends. I can mount on anything and spend as much money as needed. The needs of the network would be to provide access for, up to 15 wireless HD cameras with audio, and a public-wifi network. Can someone point me in the right direction as far as equipment and antennas ? I can provide any additional information that you may need.

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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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• Is there a simple way to detect ISP port blocking?

  - by Will M

  Is there a way to tell the difference between my ISP blocking traffic on certain ports and my NAT router/firewall blocking that traffic? The sites “Shields Up” and “Can you see me” show my ports closed or not accessible, but I assume that is primarily due to the NAT router. (Obviously, I could just remove the router, connect directly and use those sites, but is there a simple way to test without doing that?)

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• Can't route specific subnet thru VPN in ubuntu

  - by Disco

  I'm having issues routing traffic thru VPN. Here's my setup I have 3 hosts, let's call them A, B and Z B and Z have a VPN connection in the 10.10.10.x SUBNET A and B have a direct connection in the 10.10.12.x SUBNET I want to be able to route traffic from A to Z, like : A <= 10.10.12.254 [LAN] 10.10.12.111 => B <= 10.10.10.152 [VPN] 10.10.10.10 => Z On host B, i have set up ip_forwarding : net.ipv4.ip_forward = 1 and routing on host B: [root@hostA: ~]# ip route 10.10.10.10 dev ppp0 proto kernel scope link src 10.10.10.152 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.111 10.10.10.0/24 dev ppp0 scope link 169.254.0.0/16 dev eth1 scope link routing on host A: [root@hostA: ~]# ip route 10.10.10.0 via 10.10.12.111 dev eth1 10.10.12.0/24 dev eth1 proto kernel scope link src 10.10.12.254 169.254.0.0/16 dev eth1 scope link default via 192.168.1.1 dev eth0 But still not able to ping 10.10.10.10 from host A. Any idea ? I'm pulling my hairs out.

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• Unmanaged Network Switch vs Managed Network Switch

  - by David

  Currently I have an unmanaged POE switch connected to a Linksys router. I am thinking of upgrading my POE switch to a gigabit POE switch, the only problem is that the switch that I want to get is a managed switch. So here's my question: with a managed switch, can I still connect all of my devices to it and have the devices request IP addresses from the DHCP server within the Linksys router or will the devices request IPs from the managed switch since I believe the switch has its own DHCP server as well?

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• A website hosted on the 1.0.0.0/8 subnet, somewhere on the Internet?

  - by Dave Markle

  Background I'm attempting to demonstrate, using a real-world example, of why someone would not want to configure their internal network on the 1.0.0.0/8 subnet. Obviously it's because this is not designated as private address space. As of 2010, ARIN has apparently allocated 1.0.0.0/8 to APNIC (the Asia-Pacific NIC), who seems to have begun assigning addresses in that subnet, though not in 1.1.0.0/16, 1.0.0.0/16, and others (because these addresses are so polluted by bad network configurations all around the Internet). My Question My question is this: I'd like to find a website that responds on this subnet somewhere and use it as a counter-example, demonstrating to a non-technical user its inaccessibility from an internal network configured on 1.0.0.0/8. Other than writing a program to sniff all ~16 million hosts, looking for a response on port 80, does anyone know of a directory I can use, or even better yet, does anyone know of a site that's configured on this subnet? WHOIS seems to be too general of a search for me at this point...

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• I need a reverse proxy solution for SSH

  - by Bond

  Hi here is a situation I have a server in a corporate data center for a project. I have an SSH access to this machine at port 22.There are some virtual machines running on this server and then at the back of every thing many other Operating systems are working. Now Since I am behind the data centers firewall my supervisor asked me if I can do some thing by which I can give many people on Internet access to these virtual machines directly. I know if I were allowed to get traffic on port other than 22 then I can do a port forwarding. But since I am not allowed this so what can be a solution in this case. The people who would like to connect might be complete idiots.Who may be happy just by opening putty at their machines or may be even filezilla.I have configured an Apache Reverse Proxy for redirecting the Internet traffic to the virtual machines on these hosts.But I am not clear as for SSH what can I do.So is there some thing equivalent to an Apache Reverse Proxy which can do similar work for SSH in this situation. I do not have firewall in my hands or any port other than 22 open and in fact even if I request they wont allow to open.2 times SSH is not some thing that my supervisor wants.

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• Is it possible to change an "Unidentified Network" into a "Home" or "Work" network on Windows 7

  - by Rhys

  I have a problem with Windows 7 RC (7100). I frequently use a crossover network cable on WinXP with static IP addresses to connect to various industrial devices (e.g. robots, pumps, valves or even other Windows PCs) that have Ethernet network ports. When I do this on Windows 7, the network connection is classed as an "Unidentified Network" in Networks and Sharing Center and the public firewall profile is enforced by Windows. I do not want to change the public profile and would prefer to use the Home or Work profile instead. For other networks like Home and Work I'm able to click on them and change the classification. This is not available for unidentified networks. My questions are these:- Is there a way to manual override the "Unidentified Network" classification? What tests are performed on the network that fail, therefore classifying it as an "Unidentified Network" By googling (hitting mainly vista issues) it seems that you need to ensure that the default gateway is not 0.0.0.0. I've done this. I've also tried to remove IPv6 but this does not seem possible on Windows 7. UPDATE For those still having problems here is the answer to my issue and the possible reasons why:- Win7 keeps a list of the networks you visit by (I am assuming, but don’t know for sure) the MACID of the device pointed to by the Default Gateway. The default gateway is usually the constant device in a network (i.e. the NAT or router) so can be used to uniquely identify one network from another. The default gateway in the IPv4 properties panel must therefore point to an actual endpoint so windows can then keep track of it. If there is a device at the end of the Default Gateway windows will identify it and track it remembering its settings. The ways you can therefore fool Win7 is to either point the default gateway to your own IP address, or the IP address of the target device you’re communicating with. This will have the side effect of expecting that target device to start routing packets for IP destinations that are outside your subnet. So some applications on Win7 will try to communicate with the internet, these will be passed on to the default gateway (either back you the same IP address or a target device that is not a router) and thus will eventually timeout because neither can route packets. Which you can usually live with. This gets slightly complicated when you mix a this type of connection with a real connection to the internet via WIFI. The wired network card usually has priority when routing because of the “interface metric” so some applications might not connect correctly.

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• Internet access only works after turning off and on the local connection

  - by AgentFire

  Every time I turn on the computer, it has no internet access. The network card is connected to a router which broadcasts the internet all over the office LAN. Once I turn off and then on the local connection (or network card), the internet access works. Rebooting and logging out/in again does not help. Only the turning off and on the network card gives me internet access. Why is that? How do I fix it?

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• Dynamic DNS on D-Link DWR-112 3G router uses a private IP address

  - by user270151

  I'm using a D-Link DWR-112 3G router to connect to the internet by using Celcom broadband plug-in. How can I do the port forwarding to my server? I already have correctly configured my DynDNS, but every time the DynDNS will not set to public address but local private address with in the range 10.xxx.xxx.xxx. My router address is 192.168.1.1 and server address is 192.168.1.5. Can someone give me some guideline about this issue?

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