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• diagnostic multicast issue using wireshark

  - by Abruzzo Forte e Gentile

  I have a network that is setup for multicast traffic. My setup is the following -Machine A : a server generates multicast traffic. -Machine A : few clients subscribing to that multicast traffic -Machine B : few clients subscribing to that multicast traffic # Address I am using IP : 239.193.0.21 PORT: 20401 The clients in machine A , even if they join the group (I can see IGMP messages through wireshark), don't receive any data while (and this is the funny part) machine B,C and D receive everything. I sorted that issue by completely disabling Linux firewall. Before doing that, I enabled the multicast on the firwall ('reject all'). iptables -A INPUT -m addrtype --src-type MULTICAST -j ACCEPT My question is the following: what I can check in wireshark that can help me in spot such firewall issues in the futures? For TCP/IP I realize by using ping and looking at ICMP packets rejected. What I can check/monitor for multicast? I am using LInux/Red-Hat Enterprise 6.2

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• Manage Internet connection for a program

  - by michel

  I am using a Windows 7 PC with 2 network cards. One for a public line and one for an internal line behind a proxy. Is there a way or a software program where I can manage which program (Outlook, WM) uses which Internet connection or network card? Using the option of interface metric is not what I am looking for. Someone also suggested me ZoneAlarm, but I dislike this program.

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• Configure IPv6 routing

  - by godlark

  I've got IPv6 addresses from SIXXS. My host is connected with SIXXS network over a AICCU tunnel ("sixxs" interface). My host address is 2001:::2, the host on the end has address 2001:::1. On my host IPv6 is fully accessible. I have problem with configuring IPv6 network on VMs. I use VirtualBox, the VM (Ubuntu) uses tap1 (on the host bridged by br0) #!/bin/sh PATH=/sbin:/usr/bin:/bin:/usr/bin:/usr/sbin # create a tap tunctl -t tap1 ip link set up dev tap1 # create the bridge brctl addbr br0 brctl addif br0 tap1 # set the IP address and routing ip link set up dev br0 ip -6 route del 2001:6a0:200:172::/64 dev sixxs ip -6 route add 2001:6a0:200:172::1 dev sixxs ip -6 addr add 2001:6a0:200:172::2/64 dev br0 ip -6 route add 2001:6a0:200:172::2/64 dev br0 Host: routing table: 2001:6a0:200:172::1 dev sixxs metric 1024 2001:6a0:200:172::/64 dev br0 proto kernel metric 256 2001:6a0:200:172::/64 dev br0 metric 1024 2000::/3 dev sixxs metric 1024 fe80::/64 dev eth0 proto kernel metric 256 fe80::/64 dev sixxs proto kernel metric 256 fe80::/64 dev br0 proto kernel metric 256 fe80::/64 dev tap1 proto kernel metric 256 default via 2001:6a0:200:172::1 dev sixxs metric 1024 Guest: interface eth1 (it is connected with tap1): auto eth1 iface eth1 inet6 static address 2001:6a0:200:172::3 netmask 64 gateway 2001:6a0:200:172::2 Guest: routing table 2001:6a0:200:172::/64 dev eth1 proto kernel metric 256 fe80::/64 dev eth0 proto kernel metric 256 fe80::/64 dev eth1 proto kernel metric 256 default via 2001:6a0:200:172::2 dev eth1 metric 1024 The guest pings to the host, the host pings to the guest, the host pings to 2001:6a0:200:172::1, but the guest doesn't ping to 2001:6a0:200:172::1. The guest tries to ping, on the host (by tcdump) I can capture its packets, but the host doesn't send them to 2001:6a0:200:172::1. What have I missed in configuration?

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• Setting up a wireless network with Verizon MiFi

  - by winarm

  I am trying to set up a home network. I live in a location without cable internet so I have a Verizon MiFi card. I have a few laptops at the moment and they each connect through the card but I want to set up an Ubuntu 10.10 server and see if I can use it for DHCP. I have a Trendnet TEG-S50G switch and the computer I plan to use for the server has a Linksys WMP-11 Wireless PCI card. Is there any other equipment I need in order to get this to work? Is this even doable? Is there a better way to make this happen?

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• What's a good, affortable ruter that will not give me problems when downloading torrents?

  - by Lirik

  I found several routers on newegg and they're in the $50-60 range, but I'm not sure if they'll handle the number of connections that are created when downloading torrents (100-300 seeds and around 50 peers). My roommate watches netflix movies, my brother and I download torrents, so my NETGEAR router ends up choking on the traffic and I have to restart it quite frequently. I've already posted a couple of questions on the topic and I've come to the conclusion that I need a new router. What are some routers that I should consider (my budget is in the $50 range)?

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• Wireless and Wired Network Access at same time?

  - by grasper

  At work, I use a laptop. It is a Dell Latitude D630 with Windows XP. I work in a lab environment where I need to use the Ethernet Port as a Static IP to interact with a local network (which cannot talk to the outside world). What I would like to do is use the Wireless as the internet connection so i can check email, etc at the same time I am using the ethernet network... It seems like this is not possible. Is there a piece of software or a way to configure it to allow me to do this?

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• SSH: Tunnel multiple ports to remote server

  - by user1594322

  See attached diagram. Host A - Windows server Host B - Linux server Host C - VMWare ESXi server From host A I can SSH to host B over the VPN tunnel. I can ping host C from host B, but not from host A. I am assuming this is because host C has lost its default gateway. Host C is a VMWware ESXi server, so I would need to tunnel several ports (80,443,902) in order to reach host C from host A. What is the correct ssh syntax to create the tunnel in order to reach host C from host A, and can I do it using a single command, or do I need to run three commands (one for each port, 80,443,902)?

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• Wireless Router will not allow connection

  - by Chris

  I am working with a RangeMax(TM) Wireless Router WPN824 v2, and it will not allow a wireless connection nor a wired connection. I am at an actual lost, with no way into the router I cannot test settings. I have unplugged it, left it off for a 32 hours, and reset it with no luck. Any ideas? Could the router just be done-zo?

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• How to configure wpa_supplicant on RHEL6?

  - by Yang Jy

  I am running a version of RHCE6 on my laptop. I uninstalled the default NetworkManager in order that I could configure the network all in the command line. The Ethernet part is okay, but I have problem bringing up the wireless interface. What I got is: Bringing up interface wlan0: Determining IP information for wlan0... failed; no link present. Check cable? I did exactly what this article says. I am not sure if it is because the article is obsolete or something else. Please help.

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• Mimic the behavior of a machine added to a domain

  - by Ian

  Hello, For some reason, the IT department at our company does not want to add Windows 7 and Windows Vista machine to the domain controller. I hate to always provide my network credentials everytime I access a shared folder on a machine that is joined to the domain. I also hate to always provide my password when I launch outlook or Visual Studio (Team Explorer). Is there a way to mimic the behavior of a machine that is added to a domain without actually adding the machine in the domain? For shares, I can create a batch file that will NET USE the different fileservers we use here but that is a huge security risk as I will type my password as plaintext. Thanks!

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• Copying files from NAS to NAS drives

  - by user1001421

  Very simple question. I've got 2 NAS drive that are "wire" connected via a router. If I have a wireless laptop and request a large amount of data be copied from one NAS drive to the other, does the network traffic go direct from the one drive to the other, going via the wired network, or does the network traffic go via my laptop, if you see what I mean. IE. From the NAS drives wired network, to the wireless network and then back to the wired network. Is this a common bottle-neck when copying a large amount of data? And if so, is there a way to avoid it. Thanks.

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• Setting up a wireless connection

  - 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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• NAT, iptables and problematic ports

  - by Rajie

  I am building a small office network with virtual machines. My schema is this: Computer A: gateway, ip 1.1.1.1, iptables used for NAT [eth0=public internet dhcp, dhcp; eth1=gateway] Computer B: client, ip 1.1.1.2, using gateway from Computer A. NAT is working, and Computer B can access the internet using the A's gateway. I redirected some incoming ports from A to B (for instance, if A receives a request to port 80, it goes automatically to Computer B's Apache). The thing is that I do not really understand how to open/close ports for Computer B from Computer A. I know how to close a port: iptables -A INPUT -p tcp --dport 80 -j DROP And it will refuse all incoming (not output) connections to port 80. However, this works for main interface eth0. I tried to, for instance, drop ingoing and outgoing connections for Computer B, port 80: iptables -A FORWARD -i eth1 -o eth0 -p tcp --dport 80 -j DROP iptables -A FORWARD -i eth0 -o eth1 -p tcp --dport 80 -j DROP But it does not work. And I cannot figure out what I am doing wrong. Any clue?

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• Delayed startup of network icon (wi-fi)

  - by Michael Dy

  When my Windows 7 Starter netbook boots up and after everything is loaded, it takes about five minutes before the network icon near the clock becomes functional. When there's an available wi-fi signal (which automatically connects to my netbook as preconfigured) after the boot, my netbook seamlessly connects to it even if the network icon cannot be clicked or accessed. (The icon is shown to be loading for about five minutes.) During this time, when I go to Network and Sharing Center, it takes the same time to load. So even while the icon and the Center cannot be accessed, I can surf the Internet. When my netbook was still new, it didn't have this issue. How do I fix this?

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• Should I use 802.11n with a 15 Mbps ISP (Comcast Cable)?

  - by stackoverflowuser2010

  I currently own a LinkSys-WRT54GL 802.11a/b/g wireless router, and my ISP is Comcast Cable providing me with 15 Mbps (that's bits per second, I believe) download speed. I am wondering if there is any benefit with using an 802.11n wireless router to access the Internet? The maximum theoretical speed of the WRT54GL router is 54 Mbps (802.11g), which is faster than the 15 Mbps provided by my ISP. I know that 802.11n has a max bandwidth of 300 Mbps, and it would help for intra-house transfers, such as streaming video from one computer to another. But is there any benefit to 802.11n for Internet activity, such as web browswing, gaming, and streaming video from Netflix?

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• Issues with ForceBindIP on Windows 7 (x64)

  - by Craig

  I am desperately needing a solution to binding certain applications to specific network interfaces. ForceBindIP seems to be my only solution. Although the website claims it works up to XP, Google says that many users running 7 have had it work successfully. I have UAC disabled, yet still: Does anyone know why this is happening? If not, does anyone know a viable alternative to ForceBindIP? I'm a gamer and I'm addictively trying to torrent on a secondary connection while playing games online.

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• Can't view other computers on Network

  - by Darkart

  Systems: My Machine: Windows 7 Ultimate connected through ethernet into router Her Machine--Other Machine: Windows 7 Ultimate connected through wireless Router:F5D8236-4 N Wireless Router Version 1 Firmware: 2.01.03 (Apr 28 2009) ISP: Comcast Problem: I can not view the "Other Machine" on the network at all. I opened command prompt and ran net view and saw the pc name. I tried pinging the pc and it times out. Went inside the router and tried viewing the computer on the DHCP list and it can not be seen. I restored the router back to default settings and firmware and completely reset the modem and router, and created home group. I went to the other machine to configure home group settings and made sure that both PC's had identical settings. She was able to see my machine but I could not see hers. I restarted both machines and now we cant see each other at all. Also her PC ("Other Machine") had exclamation mark in the wireless icon but was connected just fine. There is no firewalls on currently or anti-virus enabled, and still can not see each other. Right now I am checking for updated drivers for the wireless card, but my question is could it be the router or something hardware related? I have went through all the settings in the Home group and visited most FAQ's and still no luck. Also as it stands I can not view her machine inside the router DHCP Client List :(

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• How do I add wireless-router to existing VPN-router>DHCP-server network?

  - by j03lar50n

  Our office just acquired a Cisco/Linksys RVL200 VPN Router for use as our primary router. We handle DHCP serving via dhcpd on a Debian server. I want to enable wireless access to our network. We have a Linksys WRT54G v5- and I'm having some difficulty setting it up to work correctly, please help!

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• Ericsson W35 ssh administration

  - by jblaster

  I picked up a Ericsson W35 at a pawn shop the other day and when I login to the administration section at 192.168.1.1 I get an error message about connecting to the database. It apparently supports ssh administration and I get a password prompt when attempting to ssh [email protected] but no passwords I try work and theres no documentation for it. Has anyone had success with ssh on the Ericsson W35 and is this issue fixable? Thanks.

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• How to make DD-WRT router's (configured like a repeater) devices be accessible on LAN? (i.e. integrate DHCP for both routers)

  - by Annonomus Penguin

  I have a D-Link DIR-600-A1 router running DD-WRT (using the 601's firmware: except for the model number, they are near identical). It has an Atheros chip, so there is no "repeater" option. You can bypass this by setting the main radio as a client to the main router, and adding a virtual radio configured as an AP. You can then set up the credentials for connecting to the main router and allowing devices to connect to the repeater/router. I have a few devices on my network: Ethernet computers Server with Samba running WiFi devices connected to the main router I then wanted to add a repeater. I have a couple of other things on the repeater: WiFi Computer Other WiFi devices. Anyway, I wanted to connect my WiFi computer to the share on my server via Samba. However, for some reason, my router treats the main router as WAN, not another device. I've tried disabling the SPI firewall: However, that doesn't work. I've tried pinging my WiFi computer from my server. However, I can ping my server from my WiFi computer. AFAIK, they are on the same subset, just using different IPs: the main one uses 192.168.0.x and the repeater uses 192.168.1.x (starting at 100 for some reason). It seems as I need to configure my router(s) to work together for DHCP. I noticed there was a "DHCP forwarder" option, but I have no idea what that would do. A quick note: for some reason (that's beyond me) my ISP disabled the capability to bridge a WiFi to ethernet connection with the router they provide (something about PPPoE or similar...). The service rep I talked to when I was having issues after I changed ISPs said that, but they couldn't explain exactly what they were "blocking." How can I get DD-WRT to not treat the client connection as WAN and the router to recognize the devices connected to the repeater?

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• Need to setup an office network, suggest some hardware?

  - by Yegor

  We have 6 windows workstations, spread out over a fairly large area. Need to share a DSL connection (upgrading to 100/100 mbit fiber in a few months) with these machines over a 1gbit network. Also need Wifi to be available for laptop use. Plan to add 2 rackmount servers for internal use as well. Can someone suggest a decent (preferably low cost) setup that will let me achieve the stuff mentioned above.

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• Is is possible to change MAC address of a WiMAX USB adapter?

  - by Salman A

  Wondering if it is possible to change the MAC address of a WiMAX USB adapter (read WiMAX, not Wi-Fi) manufactured by Motorola, ZTE, Intel etc. I've tried a few tools that did changed the MAC address of the adapter to another valid MAC address (that I coped from another equipment made by same company) but then I was not able to connect to the network, the connection software took long time stating "obtaining IP address"; then few seconds after it got one said "lost IP address". Wondering if changing MAC address of such devices actually work.

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• Why does my internet connection get cut off and is slow sometimes?

  - by user3716773

  When I first set up my internet connection it was all good and fast but after 2 months the connection started to be slow sometimes and sometimes there is no connection until i turn off my wifi then turn it on again on the laptop. And sometimes I have to restart the router. I don't know what's wrong. I think there is something wrong with the router because this problem happens with my brother's laptop and my phone too.

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• Is there any way to abstract IP address during ssh?

  - by Vivek V K

  I have a server which is in the middle of a forest. It is connected to the Internet via a microwave link and an ADSL link.Hence it has two different static IP addresses. Now if there is heavy rain, the microwave link breaks and I should use the much slower ADSL link. And I ping the microwave ip time to time to check if it is up again . But at times, I end up using the very slow ADSL link even if the microwave link is back up. Hence I need a way to automate this in the following way. 1.I need to abstract the IP address of the machine with some other name which when I use ssh or sftp, will poll both the IP and connect me to the best one. so for eg: if I say ssh -Y name@server, It should first try to connect to the microwave link if it cant, then connect to ADSL. 2.Suppose the first time I connect, the microwave link is down so it connects to ADSL, I need it to dynamically change to the microwave link once it is working again. Is this even possible?

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• How can I add a wireless router to a wired router?

  - by Tester101

  The Setup: wired D-link (EBR-2310) router connected to my cable modem. Wireless NetGear N300 (WNR2000v3) router connected to a LAN port on the wired router. What I'm trying to do: I'm trying to setup the wireless router to be a separate network, that only accesses the internet through the wired router. What I've done so far. I setup the wireless router's WAN port to get an address from ISP (which should be coming from my wired router running DHCP), and the LAN as a subnet (192.168.1). Wired router's LAN is 192.168.0. The problem: I'm not able to connect to the internet from the wireless router. At one point my wired router showed that it was handing out an IP to the wireless router, but that is not happening anymore. The question: Is what I'm trying to do possible? Am I not thinking about this properly? Do I need to buy a better wired router, with 2 WAN ports? How can I configure these routers to work together?

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