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• Can't access DD-WRT set in DHCP forwarder

  - by Chris Marisic

  This might sound amazingly stupid but I have a DD-WRT (micro) router that I placed in my network to act as a switch and as a WAP while relying on my cable modem to be the DHCP server. In my attempts to get the configuration right I put the router into DHCP forwarder which then made everything work correctly. The problem is now I can't seem to connect to the router in any fashion to add mac addresses to the WAP access list. Is there something I'm missing or do I need to try a hard reset on it and reconfigure everything?

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• Usage of two Routers on LAN

  - by brusilva

  I've currently own a Linksys E4200 and a Thomson 546v6. Because I have an IPTV service I must set the Thomson as the main router connected to the phone line so that I can distribute the video signal for 2 specific ports and the other two for LAN Access. The problem is that the Thomson doesn't like port forwards, it usually doesnt work and since I have a good router (linksys) currently only working as Access Point I would like to use it as a router itself. I don't want to do a NAT beyond NAT so my question is should I connect the E4200 and to thomson and set the E4200 as a DMZ machine and then control all trafic on the E4200 itself or is there any other option that could suit my needs better?

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

  - by SageTheGreat

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

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• Can't get my Raspberry Pi to keep a static IP

  - by JonnyIrving

  I recently got given a Raspberry Pi and I would like to be able to remote into it using puTTy from my laptop so I don't have to sit next to my tv with a keyboard and mouse to use it. I am able to get a puTTy session going when I know the IP address that my router has given the Pi on each session but it keeps changing on each reboot as I would expect. So I followed a number if instruction to go about configuring the RPi to keep a static IP address. This involved changing the file at '/etc/netwrok/interfaces' which now contains (password removed): auto lo iface lo inet loopback iface eth0 inet static address 192.168.1.82 netmask 255.255.255.0 gateway 192.168.1.254 auto wlan0 allow-hotplug wlan0 iface wlan0 inet dhcp wpa-ssid "BeBoxD304BF" wpa-psk "**********" Despite this however, each time I reboot my RPi it gives me a new dynamic IP address still. I also noticed that in the 'ifconfig' output below that the details of the eth0 doesn't contain IP details for inet addr, Bcast or Mask which have been present in all other examples I have seen online. eth0 Link encap:Ethernet HWaddr b8:27:eb:b5:95:da UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) wlan0 Link encap:Ethernet HWaddr 00:87:c6:00:33:77 inet addr:192.168.1.83 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:918 errors:0 dropped:0 overruns:0 frame:0 TX packets:277 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 Also I'm not sure if this is relevant but it can't hurt! The file at '/etc/resolv.conf' contains: domain config search config nameserver 192.168.1.254 ..I heard it might mean something on one of the pages I was looking at. I would be very grateful for any help with this. I have tried everything I can think of and would really like to get this working this weekend so I can use it from work.

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• Force failover a Cisco ASA

  - by user974896

  I have two ASA in a lan state primary\secondary configuration. None of them have "failover active" or "no failover active" in their configuration. Would it be proper to failover in a manner such as: Log into console of primary unit and issue "failover lan state secondary", log into the console of the original secondary unit and issue "failover lan state primary". To fail back simply reverse the process or Log into the console of the primary unit and issue "no failover active", log into the console of the original secondary unit and issue "failover active". To fail back issue "failover active" on the original primary (now secondary) unit, and "no failover active" on the now primary unit. I do not like the second method because it adds configuration directives that were not in place before. Will the first method work?

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• Automatic layout of manual network mapping

  - by Paul

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

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• 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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• udhcpc doesn't assign ip address

  - by Diab

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

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• Gigabit capacity

  - by abronte

  Do gigabit ports have a total throughput of 1 gigabit so that you could be sending 800 mbit and receiving 200 mbit at the same time. Or is it 1000 in and 1000 out?

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• Connection problems via Wifi (multiple devices)

  - by Kelvin Farrell

  I'm having connection issues with my router (Linksys WRT610N) at home. There are a number of things that are happening (may be more, this is just what I've mainly noticed)... 1) Using my laptop (Macbook Pro OSX Lion), I am unable to complete any operations with my external FTP server, hosted with FatCow. I can connect to it, navigate through all the files, but when I try to edit/delete/add a file the operation times out. EVERY time. I've used two other Wifi connection on my laptop and neither have this issue. 2) I am unable to upload photos/videos to Facebook or Twitter using my phone (Samsung Galaxy S2) or my tablet (HP Touchpad - CM9). Neither am I able to upload files to Dropbox via either of the devices. Same thing happens in all situations; the upload will begin and it will just hang on 0% forever. After about 10 mins I am always forced to disconnect the Wifi to stop the action. 3) My laptop is having slow internet speed, even though we are on 20mb broadband. Speedtests say I'm getting a good connection and my Ping is good, but when using streaming services like Spotify, it takes forever to load a page and frequently stops to buffer whilst playing a song. Don't know if it's worth mentioning but I have no issues with my XBox (Ethernet), AppleTV (Wifi) or my girlfrield's phone (Nokia Lumia 800 - WP7.5) on the network. I'd really appreciate any help. This is driving me insane and is really affecting both my working and leisure use of the internet.

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• Airport Express with a PC

  - by Margaret Ashcraft

  I have and airport express and my IMac works fine with the internet connection, but my husband's PC in the basement has problems. The wireless connection comes and goes. One minute it says good connection the next unavailable. I have a PC laptop that will pick up the connection in the basement just fine.

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• In TCP/IP terms, how does a download speed limiter in an office work?

  - by TessellatingHeckler

  Assume an office of people, they want to limit HTTP downloads to a max of 40% bandwidth of their internet connection speed so that it doesn't block other traffic. We say "it's not supported in your firewall", and they say the inevitable line "we used to be able to do it with our Netgear/DLink/DrayTek". Thinking about it, a download is like this: HTTP GET request Server sends file data as TCP packets Client acknowledges receipt of TCP packets Repeat until download finished. The speed is determined by how fast the server sends data to you, and how fast you acknowledge it. So, to limit download speed, you have two choices: 1) Instruct the server to send data to you more slowly - and I don't think there's any protocol feature to request that in TCP or HTTP. 2) Acknowledge packets more slowly by limiting your upload speed, and also ruin your upload speed. How do devices do this limiting? Is there a standard way?

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• 4 - 7 second delay accessing Mysql across the network

  - by Kristiaan

  Hello, our company has recently purchased a new server with the intention of replacing our aging database server. its a full 64bit 2008 enterprise system, i have got the basic server setup and configured and then installed the 64bit version of mysql on the server, this has then been configured to match where possible our existing server as much as it can. however i have noticed that when it was swapped with the production database server our software systems had an increased delay accessing the mysql database this was anything beween 4 - 7 seconds. i have tried disabling TOE, IPv6 and a few other suggested soultions to this but so far cannot find out where this slowdown is coming from. replacing the server with the production one and the delay goes away. in terms of software and hardware the servers are not very identical at all due to one being windows 2003 std with a 32bit server and the new one being windows 2008 enterprise with a 64bit server. thanks Kris

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• Windows route two logical networks on one NIC

  - by John Oxley

  I have a Windows 2003 server which has one NIC with two networks configured on it. There are two logical networks sharing the same layer 2 domain. How do I configure the server to route traffic between the two logical networks?

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• Remote Desktop fails after VPN connection.

  - by Samet Sorgut

  The remote computer is connected with Remote Desktop. When the remote computer is connected to VPN the Remote Destop freezes. It is not possible to connect to the remote computer again via Remote Desktop. What can be done to connect to this remote computer after it establishes a VPN connection? The only thing that comes to my mind is to install a second NIC and configure Remote Desktop to accept connection from this NIC while VPN is working from the other... What do you suggest?

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• Why times elapsed connecting to a server are different?

  - by user1634619

  I have a small program which connects to a server of my choice and measures the time elapsed to do so. Each time I run it it returns different result. My question is what does this time depend on ? Network congestion for one. If I choose a server that has multiple addresses e.g. google.com the length of physical link may differ from time to time ? Is it safe to assume that it also affects connection time ? Are there any other factors in place ?

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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

  - by iamrohitbanga

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

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• Resolve linux hostname in windows

  - by Martin Giffy D'Souza

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

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• Cisco Switching Module and HSRP interface Tracking

  - by Kyle Brandt

  When using 4 port switching module where each port is configured to switchport access vlan ##, for HRSP should I track the vlan interface or the FastEthernet interface? interface FastEthernet0/0/0 switchport access vlan 10 interface Vlan10 ip address 12.12.12.1 255.255.255.0 int FastEthernet0/1 ip address 192.168.1.2 255.255.255.0 standyby ip 192.168.128.1 standby track ?? ! FastEthernet 0/0/0 or Vlan 10?

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• Add 802.11n to existing 802.11g environment

  - by Andrew Robinson

  I have a small home network that is currently running 802.11g. Two computers that are capable of 802.11n and two devices (a BlackBerry and a Skype phone) that are limited to 802.11g. I have a few neighbors running 802.11g but their signals are very weak. How big an impact will the two G devices have on N speeds? Will they pull the whole network back down to G? These two devices are hardly ever used where as the other N devices are heavily used. If I add an N router to the network (instead of replacing the G) and set my existing G router to use channel 1 with 20MHz bandwidth and then set the N router to use 6 & 11 for 40MHz will I eliminate the overlap and allow for full speed on both networks?

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• Can't connect to domain computers until reboot

  - by thealliedhacker

  I have a domain with about 300 Windows 7 and XP machines, with the domain controllers running Server 2003. Sometimes, I lose the ability to communicate/authenticate with some of the machines until I reboot my computer. This also happens from other computers and regardless of user account and operating system. In other words, say I'm on ComputerA, and I can't connect to ComputerX. I can go to ComputerB and connect to ComputerX, but ComputerB may not be able to connect to ComputerY. If you reboot ComputerA, then it will be able to connect to ComputerX again. Here are some messages from various utilities: sc: [SC] OpenSCManager FAILED 1722: The RPC server is unavailable. mmc (compmgmt.msc): Computer (computer name) cannot be managed. The network path was not found. explorer (\\computer): Windows cannot access \\(computer name). ping: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss) / Average = 1ms

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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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• 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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• Windows 7 Administrator HomeUsers Account

  - by Charles Carrington

  I'm trying to login to my Windows 7 PC from another PC so that I can transfer files to the Windows 7 PC. I've just installed Visual Studio 2008 on my new PC, and I wan't to transfer all of my work from my old machine to my new one. When I first set up a user on the Windows 7 PC after a reformat, the account created had a Group field that read "HomeUsers; Administrators" when viewing it from the User Accounts screen. You get to this screen by typing "netplwiz" in the search field of the Start Menu. I changed the Group of this account to Administrators before I realized that it was assigned to two Groups -- "HomeUsers; Administrators" as I mentioned above. I was trying to make sure that it was an Administrator account so I didn't have to type in a password everytime I wanted to install software. I can use this computer normally without being asked for an administrator password all the time when I want to install new software, but I can't log in to this PC from another PC because I don't have an account that has a Group of "HomeUsers". I should have left the account alone; everything would've been fine. But there doesn't seem to be a way to assign it to two groups after the initial assignment that take place automatically when you are setting up your computer for the first time. If you assign "HomeUsers" to the account, the Group field on the User Accounts screen will just read "HomeUsers". If you assign "Administrators" to the account, the Group field on the User Accounts screen will just read "Administrators". There's no way to make it read "HomeUsers; Administrators" again. If you don't have at least one account that is a "HomeUsers" account, you cannot log in to the PC from another PC on the network. If you don't have an account that is an "Administrators" account, you cannot install software on your machine without being asked for an Administrator password all the time, which is very annoying. I want an account on my Windows 7 PC that I can use to install software without being asked for a password AND that I can log into from another PC on the network to transfer files. If I could make the Group field read "HomeUsers; Administrators" of my primary account on the Windows 7 PC when I go to the User Accounts screen by typing "netplwiz" in the search field of the Start Menu, my primary account would do what I want it to do. Does anybody know how to make an account in Windows 7 a "HomeUsers" account AND an "Administrators" account? As I said before, Windows 7 does this for you automatically when you first set up your computer. But if you change it inadvertently, there is no way to change it back. At least I don't know how to do it. If anybody has any ideas on how to fix this, I would greatly appreciate it. Thanks, Charles Carrington

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