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• How to I sync my windows mobile phone via wireless network

  - by Kibbee

  According to this article, I should be able to sync my Windows Mobile smartphone via my wireless internet connection. However, when I go to the connection settings, I only see USB and COM1 options. No option for ethernet. I have an HTC Maple (aka Snap), and it connects fine to my home wireless network, but I would like to be able to sync over the network.

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• Just one client bound to address and port: does it make a difference broadcast versus unicast in terms of overhead?

  - by chrisapotek

  Scenario: I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will start listening on this broadcast address (and port) and take over. Question: My concern is that I will be using a broadcast IP address just for a single node: the master. The failover node only binds if the master fails, in other words, almost never. In terms of network/traffic overhead, is it bad to talk to a single node through a broadcast address or the network somehow is smart enough to know that nobody else is listening to this broadcast address and kind of treat it as a unicast in terms of overhead? My concern is that I will be flooding my network with packets from this broadcast address even thought I am just really talking to a single node (the master). But I can't use unicast because the failover node has to be able to pick up the master stream quickly and transparently in case it fails.

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• How can non-admins view which files are open on a file server?

  - by Josh

  I'm on a windows workstation, and I want a list of which files are open over the network on a windows server. The Shared Folders MMC Snap-in does this visually, and SysInternals' PSFile does it from the command line, but by default only for admins. I want to let regular users do this, too. What permissions do I need to grant them?

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• Do all the network cards use the same frequency to send signals to wire?

  - by smwikipedia

  I am comparing my cable TV wire to my network wire. In a TV cable wire, different frequencies are used by different TV channels. And since a certain channel use a fixed frequency, I think the only left way to represent different signal is with the carrier wave's amplitude. But what about the network wire? For all the network cards with the same type, do they also use different frequencies to send signals just like TV cable? I vaguely remember that they use frequency adjustment to represent signals. So the frequency should not be a fixed one. So how did all the network cards that sharing the same medium differentiate their own signal from others?

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• Which network management system (NMS) to choose?

  - by QrystaL

  I need to integrate NMS in large enterprise system for data collection purposes. Primary requirements: collection by SNMP great scalability (up to 1,000 devices with 1,000 interfaces each) failover data storage in Oracle DBMS integration API (configuration, data access) Any ideas would be appreciated...

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• In an environment with multiple WiFi access points, do wireless clients sometimes connect to both at the same time?

  - by Bobby Burgess

  This is more of a curiosity than a problem, but in this new office I have two D-link DAP-2553's connected in a master/slave array (this just means the master keeps certain configuration options aligned with the slave). The network is set to 802.11n-only, and each AP has the same SSID and WPA2 key. The only difference is that they are on different channels (1 and 11). The WiFi network itself is working well. Users can roam around and the signal/speed is fairly consistent. However, I notice that when I look at the 802.11 client list in the web admin page for each of the 2 APs, I see that certain clients are connected to both, for extended periods of time, but I assume they are only passing data through one of them. Not every client is seen on each AP, but at any given time the same MAC address of a WiFi adapter can be associated (and remain associated) with both APs. The client list auto-refreshes every few seconds so I believe I'm looking at the most recent rather than stale information. One of the WiFi adapters that consistently associates with both APs is an Intel Centrino Wireless-N 1030 (laptop chip). Is it part of the WiFi standard that more than one association per WiFi card can be established concurrently on separate APS?

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• switch's mgmt-ip is not remotely reachable.

  - by RainDoctor

  Switch model: Netgear FSM7352PS mgmt-ip: 192.168.1.100/24 Vlan id: 1 (default) There are couple of hosts in this Vlan: 192.168.1.2 (esxi console), for instance. 192.168.1.1 is the firewall/router interface. I can ping 192.168.1.1 and 192.168.1.2 from other vlans, say, 172.31.0.0/24 I can ssh to 192.168.1.2 from 172.31.0.0/24 I can't ping 192.168.1.100 from 172.31.0.0/24 However, I can ping 192.168.1.100 from 192.168.1.2 or from my laptop connected to that vlan (192.168.1.11). I can connect to the web GUI from my laptop when I am in that Vlan. Can anyone shed some light on why I am not able to connect from other vlans?

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• How to configure 2 LAN Cards

  - by PatDiazJr

  How do we configure two (2) LAN cards on one computer. One LAN card is connected to the internet via the DSL through a router, configured as DHCP. The other LAN card is to be connected via our office's IP/VPN (for email and other office online processes). I know it could be done, but I do not know how. By the way, the operating system is Windows XP.

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• Ninety-Fifth Percentile Calculation for Bandwidth

  - by Kyle Brandt

  I am trying to calculate the bandwidth of my current internet connection. I am pulling the current input and output transfer rate via snmp. If the argument to the following function is a sorted ascending list of the the some of each input and output sample, is this the right way to calculate 95th percentile? sub ninetyFifth { #Expects Sorted Data my $ninetyFifthLine = (@_ * .95) - 1; return $_[$ninetyFifthLine]; }

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• I just ordered 70/10 line, and need a new router I think?

  - by data_jepp

  Before I had the 25/5 line and the n standard router did just fine. Now it doesn't do the job. Online speedtest reads at 82 so I have the line. But my laptop is getting less than 30 in my room. My laptop has the following WiFi card: http://www.intel.com/content/www/us/en/wireless-products/centrino-advanced-n-6205.html What is this talk about 2,5 and 5ghz? Can my laptop be connected at once over both bandwidths? And that would let me use the full 70Mb over wifi? Hope it's ok to ask network questions here.

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• DNS and IPs - Does DNS send the IP back to the client?

  - by Josh

  I ran across a site that talked about routing all cients requesting by IP to a "dead end." The clients accessing the site via ip it claimed were typically automated exploit tools and bots. Legitimate users type in the web address by it's domain question. With this context in mind, I don't really understand how DNS really works. I thought it worked by sending an IP back to a client for the requested DNS (like a phone book.) The client then uses the IP to access the site. The information above seems to indicate I misunderstand this. Can someone clarify this? (http://technet.microsoft.com/en-us/magazine/2005.01.hackerbasher.aspx)

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• Wireless vs. Wired: which is faster?

  - by studiohack

  I have the option of hooking up my machines to the internet either wirelessly or via ethernet cable (wired). I'm curious as to which is faster; the approximate wireless signal strength (average) is about 60%. My question is, would my internet be faster if I used ethernet, resulting in a stronger connection?

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• Cannot resolve Hostname to IP, but IP to hostname works

  - by blade

  Hi, I have deployed a bunch of windows server VMs on a cloud hosting service. These machines are all joined to a domain controller on the same service, which also hosts DNS. All of the domain-joined machines have dynamic IP (along with the DC). If I try to resolve any of the hostnames remotely, it fails. For example, I am in SQL Server Reporting Services and I need to connect to a remote server. I provide the hostname of the desired target server and this fails, but then if I provide the IP, this works. How can I pass the hostname and have this resolve to IP? Is there anything I need to look for in the DNS server? It has records of the hostnames (in forward lookup I think), but reverse is empty. Isn't it the case that forward lookup resolves ip to hostname and reverse resolves hostname to ip? Also, I don't know what he subnet mask because this is not in my control, so the machines may not be in the same subnet - can this be a cause of the problem? Where is the problem? Thanks

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• Problems with Windows Server 2012 Hyper-V

  - by user3438673

  I install a windows server 2012 R2 and then install a virtual machine on hyper-v. When i configure the virtual machine in hyper-v i configure 4gb of ram then few days later y change it to 12gb of Ram Problem the problem is when i change the ram the virtual machine star working slower and i have to return the 4gb of ram. i cretae a new virtual machine and i configure the virtual machine with 12gb of ram from start but still working to slow do you know how to solve this problem in hyper-v?

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• Crossover LAN connection between Ubuntu And Windows 7 is not working

  - by brett

  my question is closely related to: How do I connect Ubuntu 10.04 and Windows 7 with an Ethernet cable? What I am after is: Windows 7-------wireless-----\ Wifi router Ubuntu 10.04----wireless-----/ Windows 7-------wireless-----\ | cross_over_cable Wifi router | Ubuntu 10.04----wireless-----/ What I did was On Windows edit system32\drivers\etc\hosts Add the following line: 192.168.253.2 my_ubuntu_computer_name_&-wired //?not sure if this is right On Ubuntu: sudo gedit /etc/hosts Add the following line: 192.168.253.1 my_pc_computer_name&-wired //?not sure if this is right and then Ubuntu 12.04 as the host Right click on the Network Manager applet, click Edit Connections... In the Wired tab, click Auto eth0, then click Edit... In the IPv4 Settings tab, change Method: to Shared to other computers. Click Apply and enter your password when it asks you. Close everything and reboot. Plug the Ethernet cable into both computers. But, I can connect to my windows network folders from ubuntu via wifi I can't connect to my ubuntu network folders from windows via wifi(in fact this bit was working before - so my wifi connection is worse) my ubuntu Auto Ethernet seems to be on From Ubuntu eth0 Link encap:Ethernet HWaddr 00:11:2f:f3:43:8d inet addr:10.42.0.1 Bcast:10.42.0.255 Mask:255.255.255.0 inet6 addr: fe80::211:2fff:fef3:438d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:172 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:27279 (27.2 KB) Interrupt:19 Base address:0xe400 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1147 errors:0 dropped:0 overruns:0 frame:0 TX packets:1147 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:94380 (94.3 KB) TX bytes:94380 (94.3 KB) wlan0 Link encap:Ethernet HWaddr 00:03:c9:e9:6f:bf inet addr:10.1.1.7 Bcast:10.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::203:c9ff:fee9:6fbf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:13186 errors:0 dropped:0 overruns:0 frame:0 TX packets:12187 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1598882 (1.5 MB) TX bytes:1189555 (1.1 MB) From Windows: Windows IP Configuration Ethernet adapter Bluetooth Network Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Wireless LAN adapter Wireless Network Connection: Connection-specific DNS Suffix . : BoB Link-local IPv6 Address . . . . . : fe80::ecf7:c445:3725:b9c1%12 IPv4 Address. . . . . . . . . . . : 10.1.1.4 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.1.1.1 Tunnel adapter Local Area Connection* 15: Connection-specific DNS Suffix . : IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:1423:3ae3:f5fe:fefb Link-local IPv6 Address . . . . . : fe80::1423:3ae3:f5fe:fefb%23 Default Gateway . . . . . . . . . : :: Tunnel adapter isatap.BoB: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : BoB Tunnel adapter isatap.{D0C8EBA1-335D-4620-8570-6C36E8786D72}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . :

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• Are my iptables secure?

  - by Patricia

  I have this in my rc.local on my new Ubuntu server: iptables -F iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 9418 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 9418 -m state --state ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 5000 -m state --state NEW,ESTABLISHED -j ACCEPT # Heroku iptables -A INPUT -i eth0 -p tcp --sport 5000 -m state --state ESTABLISHED -j ACCEPT # Heroku iptables -A INPUT -p udp -s 74.207.242.5/32 --source-port 53 -d 0/0 --destination-port 1024:65535 -j ACCEPT iptables -A INPUT -p udp -s 74.207.241.5/32 --source-port 53 -d 0/0 --destination-port 1024:65535 -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT iptables -P INPUT DROP iptables -P FORWARD DROP 9418 is Git's port. 5000 is a port used to manage Heroku apps. And 74.207.242.5 and 74.207.241.5 are our DNS servers. Do you think that this is secure? Can you see any holes here? Update: Why is it important to block OUTPUT? This machine will be used only by me.

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• Multicast in private LAN with different subnets

  - by Gobliins

  after i read Multicast IP Addresses and Multicast accross the subnets I am confused. Configuration: I have two devices in the same network. They may not be in the same Subnet, but always in the same physical network (beyond the same router, switch etc.) I want to communicate across IP multicast either 224.x.x.x or 239.x.x.x may be more fitting because we want it local, not beyond of forward through the router. Can one machine be the receiver and the other machine sender of the same multicast address? and can the receiving machine send an answer to the sending machine?

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• What kind of router do I need to handle multiple external I.P addresses?

  - by user1308743

  I have 3 dedicated I.P addresses going to a location with a few servers, and 1 RVS4000 router. Right now, only one I.P is being used. I would like a router that can use all 3 I.P addresses and I can make rules like this: IP1:80 goes to ServerA IP2:80 goes to ServerB What kind of router/device with what features do I need to handle this? I will need to set 30-40 rules to forward certain ports to certain servers. Only a couple ports will need to go to IP2 or IP3. Thanks

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• i am not able to connect to the application hosted on port 80

  - by shiva

  I am trying to access an application that is hosted on port 80. When i try the url from my personal computer , the site is not reachable but the same url on the server( which hosts the application) i am able to access the site. When i disable the firewall then i am able to access the site from my pc. So there is some rule which is blocking this port. How do i determine what windows firewall rule is blocking this port. I have disables IIS as well. Kindly point me in the right direction

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• udp through nat

  - by youllknow

  Hi everyone! I've two private networks (each of them behind a typical dsl router). The routers are connected to the WWW. The extern interface of each router have one dynamic IP address. I want to stream data via UDP directly between one client in private network A and one client in private network B. I've already tried a lot of things (see: http://en.wikipedia.org/wiki/UDP_hole_punching, or STUN). But it wasn't possible for me to transfer data between the two clients. It's possible to use a server (located in the WWW, with static IP) to transfer the extern IPs (and extern ports) from the routers between the clients. So imagine client A knows client B's external IP and client B's external port assigned by his router. I simply tried sending UDP packet to the receivers external IP/port combination, but without any result. So does anyone know what do to communicate via UDP throw the two NAT routers? It must be possible??? Or does Skype, for example, not directly communicate between the clients when the call eachother (voice over ip). I am sorry for my bad English! If something is confusing don't mind asking me!!! Thanks for your help in advance. ::::EDIT:::: I can't get pwnat or chownat working. I tried it with my own dsl-gateway - didn't work. Then I set up a complete virtual environment using VMWare. C1 (Client 1, WinXP Prof SP3): 172.16.16.100/24, GW 172.16.16.1 C2 (Client 2, WinXP Prof SP3): 10.0.0.100/24, GW 10.0.0.1 C3 (Client 3, WinXP Prof SP3): 3.0.0.2/24, GW 3.0.0.1 S1 (Ubuntu 10.04 x64 Server): eth0: 172.16.16.1/24, eth1: 1.0.0.2/24 GW 1.0.0.1 S2 (Ubuntu 10.04 x64 Server): eth0: 10.0.0.1/24, eth1: 2.0.0.2/24 GW 2.0.0.1 S3 (Ubuntu 10.04 x64 Server): eth0: 1.0.0.1/24, eth1: 2.0.0.1/24, eth2: 3.0.0.1/24 +--+ +--+ +--+ +--+ +--+ |C1|-----|S1|-----|S3|-----|S2|-----|C2| +--+ +--+ +--+ +--+ +--+ | +--+ |C3| +--+ Server S1 and S2 provide NAT functionality. (they have routing enabled and provide a firewall, which allows trafic from the internal net and provide the nat functionality) Server S3 has routing enabled. The client firewalls are turned off. C1 and C2 are able to ping C3, e.g. visit C3's webserver. They are also able to send UDP Packets to C3 (C3 successful receives them)! C1 and C2 have also webservers running for test reasons. I run ""chownat -s 80 2.0.0.2"" at C1, and ""chownat -c 8000 1.0.0.2"" at C2. Then I tried to access the Webpage from C1 via webbrower localhost at port 8000. It didn't work. Can anybody help me? Any suggestions? If you have any questions to my question, please ask!

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• Home network with two isolated separate subnets, running on cablemodem/router and WRT-router.

  - by Johan Allgoth

  I have a new connection with a nice new router/cable-modem. I'd like to setup it up optimally and needs some pointers. I am a complete n00b when it comes to routing. I want to end up with two separate subnets, 10.1.2.0/24 and 192.168.1.0/24 each available on their own wireless channel/SSID. Both firewalled. I want my wired computers on the gigabit switch, optimally with public ips. I want to be able to reach 192.168.1.0/24 from 10.1.2.0/24, but not vice versa. Everyone should have internet access. Hardware and capabilities: Netgear CG3100. Handles cable connection. Gigabit switch. 802.11n. Can do DHCP, firewall, NAT etc. Can choose subnet. Can turn of NAT and if so hand out up to 4 public ips. Somewhat challenged when it comes to configuration. WRT-router. Runs DD/Open-WRT very stable. 100 Mbit switch. 802.11.g Can do DHCP, firewall, NAT etc. Can choose subnet. Highly configurable. I hope to be able to keep 10.1.2.0/24 on the CG3100, for speed reasons and 192.168.0.0/24 on the WRT-router for quota and user control reasons. On my 10.1.2.0/24 network I plan on running servers for various services. Should I turn of NAT on the WRT-router? Or on the cable modem? Activate what in that case? Is double NAT always f-ed up?

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• Anyone interested in obtaining a cable list from a visio Diagram? [closed]

  - by Alex

  it's my first post here. Just wondering if anyone had to deal with the following problem - you have to install over say a 100 network elements and servers - cabling is done via contractors, so you need to provide them with an accurate, error-free cable list - your inputs are a set of detailed, port by port, visio diagrams. Prb is to obtain the cable list and get the cabling started while you're busy crafting the switch/routers configs. I coded a Visio plugin, which I plan to release under the GNU license, that returns a cable list from a diagram, and tested it on intermediate size infrastructure, 2K+ cables. It works well. The tool needs a little work to be user friendly, so before getting started, I wanted to know if that was worth the effort. Questions are welcomed, let me know -A PS: the tool is targeted for those who need a port by port description of their network, in the form Source/slot/port/Destination/slot/port.

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• Block P2P traffic on a Linksys router WRT54G with Tomato firmware

  - by Kami

  I'm running a small wireless network (6 to 10 users) on a Linksys WRT54G with Tomato firmware sharing an Internet connection. I don't want the users to download files with BitTorrent (mainly used) and other P2P apps. I've also found some solutions about lowering P2P traffic priority using QoS. I really need to ban P2P traffic. Does anyone know how to setup some rules to deny that kind of traffic? I've tried to setup an Access Restriction Rule: However it's not working at all.

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• replacing 3 Cisco Catalyst 4500

  - by hoberion

  Our network supplier recommends replacing our 3 cisco catalyst 4500's because they are EOL and dont speak OSPF (which we really want) Its not my area of expertise so I cant say for sure if we really need to replace these units but for my company the estimated costs of 250K euro is a huge problem. Is there any way to cut down on costs (without moving from cisco devices), I heard the 4500´s can speak ospf but would need an upgrade of sorts? edit: version: IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9K91S-M), Version 12.2(20)EW, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) supervisor: WS-X4013+ Cisco Catalyst 4500 Series Supervisor Engine II-Plus density: WS-X4306-GB Cisco Catalyst 4500 Gigabit Ethernet Module, 6 Ports (GBIC) WS-X4306-GB Cisco Catalyst 4500 Gigabit Ethernet Module, 6 Ports (GBIC) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45)

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• Windows 7 - system error 5 problem

  - by ianhobson

  My wife has just had a new computer for Christmas (with an upgrade from VISTA to Windows 7), and has joined the home network. We are using a mix of WindowsXP and Ubuntu boxes linked via a switch. We are all in the same workgroup. (No domain). Internet access, DHCP, and DNS server is an SME server that thinks it is domain controller (although we are not using a domain). I need to run a script to back up my wife's machine (venus). In the past the script creates a share on a machine with lots of space (leda), and then executes the line. PSEXEC \\venus -u admin -p adminpassword -c -f d:\Progs\snapshot.exe C: \\leda\Venus\C-drive.SNA With the wife's old XP machine, this would run the sysinternals utility, copy shapshot,exe to her machine and run it, which would then back up her C: drive to the share on leda. I cannot get this to work with Windows 7, nor can I link through to the C$ share on her machine. This gives me a permissions error (system error 5). The admin account is a full admin account. And yes - I do know the password. The ordinary shares on her machine work fine! I guess I'm missing something that Microsoft have built into Windows 7 - but what? The machine is running Windows 7 business, with windows firewall, AVG anti virus, and all the crap-ware you get with a new PC removed. Thanks

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