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• iftop Shows Lots of Mysterious Connections - Not Showing in netstat

  - by HOLOGRAPHICpizza

  I've just stopped all pretty much all services except sshd on my server (Ubuntu Server 10.04), and when I run iftop I get output that looks like this: 12.5Kb 25.0Kb 37.5Kb 50.0Kb 62.5Kb mqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqqq flash.gateway.2wire.net:ssh <=> 172.16.1.151:60405 1.75Kb 1.54Kb 2.22Kb flash.gateway.2wire.net:21095 <=> 69.127.29.20:32582 536b 107b 27b flash.gateway.2wire.net:21095 <=> 190.164.122.134:13557 0b 105b 26b flash.gateway.2wire.net:21095 <=> 79.165.212.195:45138 0b 105b 26b flash.gateway.2wire.net:21095 <=> 151.42.15.151:9031 0b 72b 18b flash.gateway.2wire.net:21095 <=> 88.185.120.179:51413 0b 0b 49b flash.gateway.2wire.net:21095 <=> 178.120.152.97:25924 0b 0b 29b flash.gateway.2wire.net:21095 <=> 109.110.217.77:27868 0b 0b 26b flash.gateway.2wire.net:21095 <=> 84.13.201.90:16509 0b 0b 26b flash.gateway.2wire.net:21095 <=> 171.7.125.224:11777 0b 0b 26b flash.gateway.2wire.net:21095 <=> 115.177.164.170:21360 0b 0b 26b flash.gateway.2wire.net:21095 <=> 50.88.126.18:25540 0b 0b 25b flash.gateway.2wire.net:21095 <=> 223.206.230.163:13431 0b 0b 25b flash.gateway.2wire.net:21095 <=> 78.144.187.26:24515 0b 0b 25b flash.gateway.2wire.net:21095 <=> 83.20.61.211:27572 0b 0b 25b flash.gateway.2wire.net:21095 <=> 82.134.151.42:18448 0b 0b 18b flash.gateway.2wire.net:21095 <=> 126.117.95.247:25316 0b 0b 18b flash.gateway.2wire.net:21095 <=> 116.202.65.230:9044 0b 0b 18b flash.gateway.2wire.net:21095 <=> 88.120.63.205:51413 0b 0b 17b qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq TX: cumm: 61.6KB peak: 8.00Kb rates: 1.59Kb 1.38Kb 2.04Kb RX: 18.4KB 1.64Kb 696b 549b 640b TOTAL: 80.0KB 9.64Kb 2.27Kb 1.92Kb 2.66Kb This is the first part (not the unix socket part) of the output of netstat -a: Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:55677 *:* LISTEN tcp 0 0 flash.gateway.2wire:ssh 172.16.1.151:60405 ESTABLISHED tcp 0 48 flash.gateway.2wire:ssh 172.16.1.151:60661 ESTABLISHED tcp6 0 0 [::]:ssh [::]:* LISTEN udp 0 0 *:37790 *:* What could all those strange connections on port 21095 be? And why would they not show up in netstat?? Any advice would be greatly appreciated.

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• is it possible to get IP address of a wifi that you are not connected to

  - by coltonon

  Just like the question states. Is it somehow possible to get the IP address of a network that you don't have access to? For example, if you click the little wifi button on your task bar, and highlight your cursor over one of the options, you get some info. But your external IP address is actually the address of the router, isn't it? Which would mean you would have to connect to the wifi, and then the router to get an IP address, correct? I realy just want a simple answer: No or Yes and here's how

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• NAT ports - how do they work?

  - by Davidoper

  I have the following network schema: Computer A: three nics: NIC 1 (eth0): dhcp, public internet NIC 2 (eth1): static 192.168.1.1, gateway for Computer B NIC 3 (eth2): static 192.168.2.1, gateway for Computer C Computer B: static 192.168.1.2, using gateway 192.168.1.1 (NIC 2). Computer C: static 192.168.2.2, using gateway 192.168.2.1 (NIC 3). So I applied this to get NAT working: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE Every computer can connect to the internet now. I have been applying rules to the main computer (Computer A), like dropping connections to some ports, e.g ssh: iptables -A INPUT -p tcp --dport 22 -j DROP But for instance, now I would like only allow connections for ports 20,21,22,53 and 80 in Computer C, and ignore the outside traffic if it's not related to those ports. The allowed connections should be FROM Computer C to outside, but not from outside to Computer C (I mean - Computer C is not hosting any HTTP or SSH, but it is going to use them as a client). I guess this sould be done like this: iptables -A OUTPUT -i eth2 -o eth0 -p tcp --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth2 -o eth0 -p tcp --sport 21 -m state --state ESTABLISHED -j ACCEPT The last rule (dropping any other traffic different from those) is at the end of the configuration, so -A should be working correctly. The thing is... it is not working. If I put the last rule like this: iptables -A FORWARD -i eth2 -o eth0 -j DROP It just drops everything and, for instance, port 21 (previously opened as you can see above) is not either working. Can you tell me what could I have done wrong? I have been struggling with this problem for some time and I am unable to solve it. Thanks!

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• Setting up a wireless connection b'ween 2 clients

  - by shadeMe

  I've got a DLINK router connected to my ADSL modem that forms the hub of my home network. I've two clients - A desktop with an onboard wireless adaptor and a laptop that's outfitted with the same. The former runs Windows 7 x64, the latter Windows XP x86. I'd like to setup a wireless connection between the two that would allow me play games over to and to a lesser extent, transfer and stream data. How would I go about doing it ?

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• DD-WRT router causing IP address conflicts across network

  - by r.tanner.f

  My DD-WRT router has lost its mind! I just set up two DD-WRT routers, one as a WAP (working fine) and one in Client Bridge (routed) mode (the problem). Not long after setup I started seeing IP address conflicts on other machines. The event log always points the finger at my Client Bridge router's MAC address. Neighbour table overflow The log on my router is flooded with Neighbour table overflow errors. These start a minute or two after boot. The network is rather large, with +200 IP addresses being used in this subnet. The other router shows no such errors. Mass ARP requests from 1.1.1.1 I'm also seeing constant ARP requests (with the problem router's MAC address) from 1.1.1.1. Seems like it's bugging everything on the network for its MAC address and then promptly forgetting it (or never receiving a response). Configuration: Model: Buffalo N600 Firmware: DD-WRT v24SP2-MULTI (03/21/11) Wireless Mode: Client Bridge (routed) I'm not sure what configuration details are relevant and I'd rather not have comments flooded, so just ping me in this chat if you want to know something. Why is my router stealing IP addresses and how can I stop it?

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• What are some of the best wireless routers for a price-conscious home power-user?

  - by Alain

  I'm extremely dissatisfied with the 'popular' choice for routers in homes and small offices. They are expensive (upwards of 60$), lack a great deal of useful configuration options, and seem to need to be restarted quite often. (Linksys comes to mind). I've been on the market for a good router lately, and slowly collecting a set of requirements I feel good routers should meet. Maximum number of TCP/IP connections. - This isn't something I see any routers advertise, but in terms of supporting torrent applications, I've been screwed by routers that support less than 20 here. From what I understand a fairly standard number is 200, but there are not so expensive routers that support thousands. Router configuration menu - Most have standard menu's that let you set up basic things like your wireless network encryption settings, uPnP, and maybe even DMZ (demilitarized zones). An absolute requirement for me, however, are routers with good enough firmware to support: Explicit Port forwarding Assigning static local ips to specific mac addresses, or at least Port forwarding by MAC address Port, IP and MAC filtering Dynamic DNS service for home users who want to set up a server but have a dynamic IP Traffic shaping (ideally) - giving priority to packets from certain machines or over certain ports. Strong wireless signal - If getting a reliable signal requires me to be so close to the router that I can connect an Ethernet cable, it's not good enough. As many Ethernet ports as possible. - Because I want to be able to switch from console gaming to PC gaming without visiting my router. So far, the best thing I've stumbled upon (in the bargain bin at staples) was a 20$ retail plus router. It was meant to be the cheapest alternative until I could find something better to purchase online, but I was actually blown away by the firmware capabilities. It supports defining reserved bandwidth for certain network traffic, dynamic DNS, reserving local IPs for specific MAC addresses, etc. At 2 am when my roommate is killing our Internet with their torrents, I can limit their bandwidth without outright blacklisting them. I have, however, met serious limitations when it comes to network traffic between local machines. It claims a 300Mbps connection, but I have trouble streaming videos from my PC to my console or other laptops wirelessly. It has a meltdown and needs to be reset once in a while (no more than a couple times a month), and it's got a 200 connection limit. There 4 Ethernet ports in the back but I'm pretty sure the first doesn't work. So some great answers to this question would be: Any metrics you use to compare routers, and requirements you have for new candidates. The best routers you've found for supporting home servers, file management systems, high volume torrent traffic, good price/feature ratio, etc. Good configuration advice (aside from 'use Ethernet whenever possible') Thanks for your feedback and experiences!

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• getting Internet connection sharing working in a slightly more complicated configuration

  - by tirichitirca t

  I have the following configuration: Computer A - Mac OSX 10.8.4, wireless & wired adapters Computer B - Windows 7 (64 bit), wireless & wired adapters, has internet connection via the wired adapter (ethernet) d-link wired/wireless router. Problem to solve: Connect from computer A to the internet through the wired connection of computer B. I tried the following: I set up a local network between A and B using the d-link router. The configuration is this: D-link router - 192.168.0.1 A - wired connection to the d-link router, static 192.168.0.101 (I could have used the wireless but I preferred the wired connection) B - wireless connection to the d-link router DHCP 192.168.0.102 (but I made sure it always gets the same address) B - wired connection to the internet using some address that begins with 10.x.y.z. In this configuration A can see B. I enabled ICS on the wired adapter of B. I set up the Gateway of A to point to B and DNS servers to point to the DNS servers specified for the 10.x.y.z address. It doesn't work, A goes only as far as B. It can ping the 10.x.y.z address of B though. I then found this article: http://terrybritton.com/windows-internet-connection-sharing-ics-not-working-with-linux-bridging-is-the-solution-916/. Terry is suggesting that a bridge should be defined on B between the two connections. I tried that but basically computer B is screwed as soon as I create the bridge. It can't connect to the internet anymore. It is as if the network bridge seems to think the traffic to the internet should go from the wired connection to the wireless and not the other way around. The other thing that puzzles me is the router itself. In general the router needs an internet address. In a normal configuration it is the router that gets the ip address and the internet traffic goes through the router. In my case I am not interested in that. So, any suggestions to get this working? I wouldn't shy away from using a commercial software but I would think windows 7 should allow me to do it. Thanks

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• 802.11N Windows XP Clients Unable to See Each Other

  - by zippy_raggle

  I am attempting to update my wireless network from 802.11g to 802.11n. When connected to the 'G' access point, the client laptops (there are 7 running Windows XP) are able to connect and browse the network for each other. When I connect them to the 'N' access point they can see the access point, but not the rest of the network. I tried swapping out the access point with a wireless router, but this did not change anything. I verified in both the AP and the router that isolation was turned off. Searching the web has not turned up any other ideas. The manuals don't show anything either. Why can't my wireless client nodes see each other on the 'N' network?

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• Linux (Ubuntu 12.04) two gateways one nic

  - by David

  I have Ubuntu 12.04 Server edition Two gateways, both on 192.168.0. network, let's make them 192.168.0.1 and 192.168.0.2 I've read you should be able to add second gateway into /etc/network/interfaces, that it will build out all the routing automatically, but I get "duplicate option" error. So if I have one default gateway, let's say 0.1, and a connection comes through from the 0.2 gateway, my understanding is that it still tries to respond through 0.1 gateway. Can we change this behavior?

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• Looking for network simulator (subnets, routers, etc..).

  - by meyosef

  Hi, I looking for network simulator (subnets, routers,wireless etc..) to study ho for interview that i have. Thanks

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• Using wireless interface in guest OS with bridged network in VMware fusion 3

  - by Chetan

  I'm running Ubuntu in Snow Leopard with VMware fusion 3, and I want to be able to access the wireless network on eth1 within Ubuntu so I can run tools like aircrack-ng. However, the bridged network that VMware sets up connects my Airport interface in Mac to the wired interface eth0 in Ubuntu. How do I set it up so that the Airport interface is connected to the wireless interface eth1 in Ubuntu?

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• accessing a web server from the LAN and WAN

  - by jessh

  My router does not support loopback. In order to view a webpage on my server, I either have to type in the local ip (192.168.1.201), or be on another network. What are my options for making this easier? Here are some possible things: Route all web traffic through an external proxy (seems to be overkill) Run my own DNS server (where to start?!) Buy a new router that supports loopback. Surely there is another way that I can use my laptop on the LAN and the WAN by typing in my domain more easily than these solutions.

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• Motorola SBG6850 / Linksys WRT54G network problem

  - by user96407

  I am trying to resolve issues with connecting my desktop and LAN capable printer to my network. I recently upgrade to the Motorola Cable Modem Gateway SBG6580 and have TWC coming into it, this works great for wired and wireless connectivity. Although, I am unable to connect to my device from this modem gateway. So, I am trying to cable a Linksys WRT54G (firmware 4.21.4 build 0) to the backside of the SBG6850 so I can use my printer on my network from both my wired desktop and wireless devices. I am pulling wireless off of the SBG6580 and do not want to change this. I have disable the wireless feature on the Linksys WRT54G at this moment. Can someone please help me through this dilemma? I am open to both wired and wireless solutions, but please tell me which approach your sharing in the first line of your response. Cheers!

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• Upgrading my home network to Gigabit Ethernet and Wireless-N turns out slower than before

  - by Raheel Khan

  My home network has three desktops, three laptops and some NAS drives. All desktops and NAS drives support Gigabit LAN and all laptops support Wireless-N. I was running a 100 BaseT switch though. I recently purchased a Gigabit Ethernet Switch and an Wireless-N ADSL Modem-Router. After upgrading, I noticed that the wireless file transfer speeds from laptop-to-NAS and vice versa became terribly slow. Possibly even slower than before the upgrade. The transfer speeds from desktop-to-NAS (wired) have improved though. As an example, copying a 50GB file from laptop-to-NAS was estimated at 15 hours! Is there something I can do to improve this? Also, should I consider buying a dedicated wireless access point for speed rather than using the Wireless modem-router?

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• DIR 601 No wireless internet

  - by ashley

  I have an orange globe on my d link router. I signed into 192.168.0.1 and went to Manuel Internet Connection Setup as I was told to do. When I clicked on that and tried to clone my PC's MAC address, it said invalid MAC address. Host Name : DIR-601 Use Unicasting : (compatibility for some DHCP Servers) Primary DNS Address : 0.0.0.0 Secondary DNS Address : 0.0.0.0 MTU : (bytes) MTU default = 1500 MAC Address : F8:1E:DF:EA:38:E6 How do I get a valid MAC address so I can save the settings and move on to the next steps I was told to do in order to get wireless internet again?

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• Mysterious problem...can remotely connect to a system but can't browse back out.

  - by GregH

  I have LogMeIn installed on my home system. I went on travel and my wife called saying that none of our home systems could browse the internet. I thought I would try to connect to my home system using logmein. Surprisingly, I was able to connect to my home system and log in without any problems using logmein. When I opened a browser from my home system, I indeed could not browse. I opened a command prompt and tried to ping my router (192.168.1.1) and it failed/timed out. How is this possible? I can remotely connect to my system but once logged in cannot even ping my router. What's up with that?

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• Number of Splitters on Coaxial Connection and Cable Internet Quality of Service

  - by Matthew Ruston

  Does running multiple coaxial splitters on a single coaxial cable line effect quality of service for cable internet connections? Suppose there are 2-4 splitters between the cable line coming into a building before the connection to a cable modem, does this negatively effect the latency, throughput, etc of a cable internet connection by any measurable amount? Is there a maximum number of times that a coaxial cable can be split into multiple internet and TV connections before QoS suffers?

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• IPs on home network

  - by windchime

  I have a Linksys router and a Belkin wireless router at home. The Linksys router is connected to cable modem and two computers, as well as to the Belkin wireless router. A 3rd computer is connected to the Belkin router through Wifi. The IP addresses of the computers connected to Linksys are 192.168.1.101 and 192.168.1.102. The IP address of the Linksys router on LAN is 192.168.1.1. The IP address of the Belkin wireless router is 192.168.2.1(based on the 3rd computer's routing table) and the IP address of the 3rd computer is 192.168.2.5. If I ping 192.168.1.101 from 192.168.2.5, all are well. However, if I ping 192.168.2.5 from 192.168.1.101, Destination Host Unreachable. Why?

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• How to gain admin privileges on D-Link router if my isp is not allowing me to do so?

  - by Fischer

  So I switched to new ISP yesterday, they gave me a D-Link router, can't use my old router. I want to change the wireless password, went to 192.168.1.1, I can login with the the username and password user user, but not as admin. On the catalog it says that the default username and password are admin admin, tried that didn't work. Tried admin and no pass, tried many combinations, none worked. I asked some other users and they said that the isp is blocking the users from logging in as admins, and blocking the reset button, and said that there's a hack where you do something like: cmd telnet "router ip" and do something like dumpcfg. Could you please give a better explanation on how to gain admin privileges on your own router if your isp is not letting you do so by default?

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• How can I monitor network traffic in an all Mac home network?

  - by raiglstorfer

  I have an all Mac network consisting of an Airport Extreme, 1 MacPro, 1 Mac Mini, 2 MackBook Pros, 2 iPads, and 2 iPhones. The Mac Pro is connected directly to the Airport Extreme via Cat5 and the rest is all running via Wireless. Lately I've been getting prompted by Google to enter Capchas frequently. The message states that I might have software running on my network I'm not aware of. My wireless router is password protected using WPA2 Personal and I frequently change my password so I don't think someone is using the network from outside (but I've no way to confirm this). I'm looking for a relatively cheap (preferably open source) solution that would enable me to monitor and profile the network usage by machine and port. Can someone recommend a solution?

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• Unable to outside access service from inside LAN

  - by erotsppa

  I have a weird port forwarding problem. I tried to open my port 22 to the outside network. I was able to access it as long as I am not inside the LAN. I can access it from my office for example. But from within the LAN, I can access the port using the local ip, but I can't access the port using the external IP. It's as if the router is blocking the loopback. I've check all my router settings, turned off anything firewall/filtering related. Any ideas?

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• Hardware, network infrastructure for runnng gaming server nd on VirtualGL

  - by archer

  Foud nice project VirtualGL (http://www.virtualgl.org/). Tried to run 3D fames (EVE Online, Prototype) on server and display the output on thin client using 100Mbps network. Server: Gentoo Linux on AMD Phoenom II x6 3.4Gz, 8GB RAM, 2x NVIDIA 9800 GTX in single session with display resulution 1024x768 on client. Performance is very promising. Going to increase network speed to 1Gbps (using either Ethernet or Fiber) and run 5-6 clients simultenously. My questions are: a) what would be better for network - 1Gbps Ethernet or Fiber (clients are distributed in max 20m around server)? Is that a must to use managed switch for better network performance? b) Should I increase number of video cards to put in SLI on server (going to use Gigabyte GA-890FXA-UD7 which has 6 PCIExpress slots [2 x4, 2 x8 and 2 x16]). Will it impact performance significantly. If I need to increase the number of video cards - what would be better - put 2 banks of video cards with 3 in bank using SLI, or 3 banks with 2 in the bank? Would linux recognize that and properly use all banks of video cards? c) any suggestions on good thin clients supporting 1920x1080 HDMI video and 1Gbps network I understand that my questions can't be answered clearly (unless someone already managed to use this kind of stuff ;)) although any suggestions would be very helpful.

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• How to access internet from 2 laptops with data card plugged-in in one of the machine?

  - by learnerforever

  Hi, I have 2 laptops - one running Windows XP and other running Vista. Both have wifi card.I have one Reliance broadband data card. I want to be able to access internet on both the machines simultaneously using this one data card. Please help. I think, there would be many many ways to do it. I do have some linksys router but any simple quick way without any extra hardware? like we could set up p2p or WLAN between these 2 machines, because both have wifi card so we shouldn't compulsorily need any extra hardware(?) I am fine with connecting data card to either of the machines. Thanks,

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• Why am I seeing MailSlot Browse messages on unrouted ports of my Linux box?

  - by nmichaels

  I have a Linux box (Debian squeeze) with several NICs. The ones of interest are: eth3 - my main link to the network (dhcp on 10.20.30.0/24) eth0 - the first connection to my test network (static: 192.168.1.2) eth4 - the second connection to my test network (static: 192.168.1.1) My routing table looks like this: $ sudo route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.20.30.0 * 255.255.255.0 U 0 0 0 eth3 default 10.20.30.254 0.0.0.0 UG 0 0 0 eth3 I have the 2 test net ports connected to each other with a crossover cable and an instance of wireshark running on each port. Every once in a while, I'll see a packet like the following show up. Who could be doing this, and how do I convince them to stop? I do have Samba running on the machine (for a cifs mount) but don't see why it would be sending packets out to unrouted ports. I had a Windows VM running in VMWare Client and thought that might be causing it, but it still happens without it. What I want is totally silent interfaces so I can run some tests with Scapy over them.

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• How can I auto-connect to a WPA2 Enterprise network?

  - by Demetri

  I would like my computer to automatically connect to a WPA2-Enterprise network as soon as it boots whenever the network is available, without any action needed by me. The computer already offers to connect, and even remembers the password, but I must still hit 'Enter' to connect. Also, connection does not occur if my login is at the terminal. I would like to automatically connect every time I login, no matter how I do so, unless a more preferred network is available. What is the best way to do this? I am running Fedora 19. A shell script that can be invoked at the terminal would be preferred. Connecting even if the Gnome-desktop has not launched is a must.

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