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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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  • Share laptop's Wi-Fi with a LAN connection and a mobile device

    - by xperator
    OS: Windows 7 64bit I want to share my laptop's internet connection between my PC and my Android device. But I can only do one of them at a time. The laptop is connected to internet wirelessly. The PC is connected to the laptop using a Ethernet cable and internet is shared between them. I want to connect my mobile device to my laptop by making the laptop into a Wi-Fi hotspot. PC (Ethernet) == Laptop (connected to net by Wi-Fi) <== Mobile device (Wi-Fi hotspot) I have 3 connections in my laptop: Wireless Network Connection (internet - shared) Local area connection (PC) Wireless Network Connection 2 (Wi-Fi hotspot) Every time I have to disable either the LAN to get the Wi-Fi hotspot working, or disable the Wi-Fi hotspot to get LAN working. How can I share so I can use both at the same time?

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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 I am not sure if it is because the article is obsolete or something else.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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Diagnosing packet loss / high latency in Ubuntu

    - by Sam Gammon
    We have a Linux box (Ubuntu 12.04) running Nginx (1.5.2), which acts as a reverse proxy/load balancer to some Tornado and Apache hosts. The upstream servers are physically and logically close (same DC, sometimes same-rack) and show sub-millisecond latency between them: PING appserver (10.xx.xx.112) 56(84) bytes of data. 64 bytes from appserver (10.xx.xx.112): icmp_req=1 ttl=64 time=0.180 ms 64 bytes from appserver (10.xx.xx.112): icmp_req=2 ttl=64 time=0.165 ms 64 bytes from appserver (10.xx.xx.112): icmp_req=3 ttl=64 time=0.153 ms We receive a sustained load of about 500 requests per second, and are currently seeing regular packet loss / latency spikes from the Internet, even from basic pings: sam@AM-KEEN ~> ping -c 1000 loadbalancer PING 50.xx.xx.16 (50.xx.xx.16): 56 data bytes 64 bytes from loadbalancer: icmp_seq=0 ttl=56 time=11.624 ms 64 bytes from loadbalancer: icmp_seq=1 ttl=56 time=10.494 ms ... many packets later ... Request timeout for icmp_seq 2 64 bytes from loadbalancer: icmp_seq=2 ttl=56 time=1536.516 ms 64 bytes from loadbalancer: icmp_seq=3 ttl=56 time=536.907 ms 64 bytes from loadbalancer: icmp_seq=4 ttl=56 time=9.389 ms ... many packets later ... Request timeout for icmp_seq 919 64 bytes from loadbalancer: icmp_seq=918 ttl=56 time=2932.571 ms 64 bytes from loadbalancer: icmp_seq=919 ttl=56 time=1932.174 ms 64 bytes from loadbalancer: icmp_seq=920 ttl=56 time=932.018 ms 64 bytes from loadbalancer: icmp_seq=921 ttl=56 time=6.157 ms --- 50.xx.xx.16 ping statistics --- 1000 packets transmitted, 997 packets received, 0.3% packet loss round-trip min/avg/max/stddev = 5.119/52.712/2932.571/224.629 ms The pattern is always the same: things operate fine for a while (<20ms), then a ping drops completely, then three or four high-latency pings (1000ms), then it settles down again. Traffic comes in through a bonded public interface (we will call it bond0) configured as such: bond0 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:5d inet addr:50.xx.xx.16 Bcast:50.xx.xx.31 Mask:255.255.255.224 inet6 addr: <ipv6 address> Scope:Global inet6 addr: <ipv6 address> Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:527181270 errors:1 dropped:4 overruns:0 frame:1 TX packets:413335045 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:240016223540 (240.0 GB) TX bytes:104301759647 (104.3 GB) Requests are then submitted via HTTP to upstream servers on the private network (we can call it bond1), which is configured like so: bond1 Link encap:Ethernet HWaddr 00:xx:xx:xx:xx:5c inet addr:10.xx.xx.70 Bcast:10.xx.xx.127 Mask:255.255.255.192 inet6 addr: <ipv6 address> Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:430293342 errors:1 dropped:2 overruns:0 frame:1 TX packets:466983986 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:77714410892 (77.7 GB) TX bytes:227349392334 (227.3 GB) Output of uname -a: Linux <hostname> 3.5.0-42-generic #65~precise1-Ubuntu SMP Wed Oct 2 20:57:18 UTC 2013 x86_64 GNU/Linux We have customized sysctl.conf in an attempt to fix the problem, with no success. Output of /etc/sysctl.conf (with irrelevant configs omitted): # net: core net.core.netdev_max_backlog = 10000 # net: ipv4 stack net.ipv4.tcp_ecn = 2 net.ipv4.tcp_sack = 1 net.ipv4.tcp_fack = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_timestamps = 1 net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_max_syn_backlog = 10000 net.ipv4.tcp_congestion_control = cubic net.ipv4.ip_local_port_range = 8000 65535 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_thin_dupack = 1 net.ipv4.tcp_thin_linear_timeouts = 1 net.netfilter.nf_conntrack_max = 99999999 net.netfilter.nf_conntrack_tcp_timeout_established = 300 Output of dmesg -d, with non-ICMP UFW messages suppressed: [508315.349295 < 19.852453>] [UFW BLOCK] IN=bond1 OUT= MAC=<mac addresses> SRC=118.xx.xx.143 DST=50.xx.xx.16 LEN=68 TOS=0x00 PREC=0x00 TTL=51 ID=43221 PROTO=ICMP TYPE=3 CODE=1 [SRC=50.xx.xx.16 DST=118.xx.xx.143 LEN=40 TOS=0x00 PREC=0x00 TTL=249 ID=10220 DF PROTO=TCP SPT=80 DPT=53817 WINDOW=8190 RES=0x00 ACK FIN URGP=0 ] [517787.732242 < 0.443127>] Peer 190.xx.xx.131:59705/80 unexpectedly shrunk window 1155488866:1155489425 (repaired) How can I go about diagnosing the cause of this problem, on a Debian-family Linux box?

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  • How to increase wifi speed for laptops

    - by sagar
    Now, Let me explain the situation. I am having a query regarding Wi-Fi network. I am having PC & laptop. I requested my Wi-Fi providers that I want connection in my PC. So that - Wi-Fi provider set up an Antenna on my building Terrace - They joined a cable to pc & that Antenna. ( I think using RJ45 connector ) - The reason behind this - my does not have a built in Wi-Fi adapter. Now - almost laptops have built in Wi-Fi. Now - On terrace there is Wi-Fi with superb speed. But on my flat - Wi-fi comes with low speed. So, when ever I use internet on my pc - it has great speed - but my laptop works with low speed. The reason behind this - PC is catching wifi from terrace & laptop is catching the wifi from it's own place. Now, My question is something like this. Can we place an antenna or something like that & connect it to laptop for better wifi speed? ( I am not technical person - Please add comment for down vote - if any ) ( Please add comment for more explanation of my Problem ) Thanks in advance for sharing your knowledge. Sagar

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  • What is a reasonable range for signal strength when next to my router?

    - by Jeff
    I know that these things depend largely on specific hardware but I don't even know if I am in the neighborhood. What would a reasonable range of signal strength be when my device is less than 5 feet from my router? House3 is my main router at 61% strength and that seems very low! Repeater is my... repeater which is 50' away in the next room. I'm not terribly concerned with the Repeater until I get my main router settled.

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  • Shareing two internet connections on my laptop running Windows XP

    - by ashwnacharya
    I have two internet connections, one is internet via our organization's corporate LAN network, and the other one is mobile broadband via a USB modem Is there anyway I can share internet connections and use them simultaneously? I want to use the corporate LAN network for normal browsing and connecting my email client, and I want to use the USB modem for establishing a VPN connection. Will I be able to maintain both the connections simultaneously? Can I have parallel downloads, one using our corporate network, and the other one using the mobile broadband? Will I be able to switch my browser between these two connections? My laptop runs Windows XP Service Pack 2.

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  • What is a usable throughput for a home media server

    - by Craig
    I am looking to setup a home server that will act as a media server. This will include both video (possibly HD) and audio. The clients will be a fun mix of hardware but that is a different question. What I want to know is what is the minimum throughput for streaming video without hitches? Is there a "sweet" spot for throughput (price vs. throughput)? I am determining my budget for this "upgrade" and I need to evaluate wether or not upgrading to a 1 Gbps home LAN is required. Sure, it would be sweet and easily handle the traffic but I don't want to do it unless it is necesary.

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  • Configuring home wireless network

    - by dvanaria
    I'm new to setting up a home wireless network. I have Comcast tv/internet/phone service (modem included) as well as a wireless router. My question is pretty basic. How can I tell the performance of the following parts of the network? 1. incoming internet speed 2. speed of the modem 3. speed of the wireless router I basically want as fast an internet connection as possible, of course, but I'm not sure where to look for the bottleneck (and so, not sure where I can spend some money to speed things up). Right now I'm getting about 36 Mbps (as it shows in Windows). If I run an online speed test (xfinity has one) it shows Average download speed of 14.91 Mbps and Average upload speed of 5.72 Mbps. Thanks for your help.

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