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• Network bridge does not work on Windows 7

  - by D. Strout

  I am trying to use Windows 7 to bridge my wireless and wired connections together to get wireless on a second Windows XP computer (fresh install). The network bridge is created successfully, but when I connect the cable from the first computer with the bridged connections to the second one with just a wired connection, nothing happens. The second computer doesn't connect, and the first computer shows no sign of anything different. I tried bridging the connections of a third computer, and connecting this computer to the second computer. This worked (third computer bridged the wireless to the second computer). Thus, the problem must be with the first (Win 7) computer. However, I have no idea what the problem could be. All Internet Connection Sharing is turned off. Homegroup is disabled (it was originally enabled, I thought that might be a problem, so I disabled it). Also, I had VMWare fusion installed, and that created extra items in the "This connection uses the following items" box in the properties dialog. Thinking this might be causing issues, I uninstalled that too. Still, with everything I tried, I can't get it to work. Any suggestions? Edit: Another thing I noticed that might be worth mentioning: The network icon in the Win7 taskbar has a red X on it that means it's not connected, but when I click the icon, it says connected next to my wireless connection, and I am able to access the internet.

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• Microsoft Windows DHCP: Steering IPv4 clients into specific scopes based on MAC

  - by Easter Sunshine

  We have visitors on our campus who bring their own laptops and devices and use our wireless and wired networks. When we receive a copyright infringement notice (typically BitTorrenting), we are required to quarantine that MAC address so that it no longer has Internet access. No matter what website it tries to visit, it is sent to a web page explaining to the user that the device has been quarantined. We have thus far implemented this in ISC DHCP on Linux. We have multiple VLANs with one or more public-IP subnets and one RFC1918 quarantine subnet each. All clients are leased IPs in the public-IP subnet(s) unless you're in a list of known bad MACs. Then, you are sent to the quarantine subnet so that your traffic is unroutable on the Internet (you are isolated by subnet only, not by VLAN). We would like to move to Windows DHCP in light of the IPAM role but I cannot figure out how to replicate this in Windows DHCP 2012 (Assign DHCP IPs for specific MAC prefixes on Windows Server 2008 R2 suggests it was not possible in 2008 R2), even while using policies. So here's what I'd like: The administrator/help desk provides and maintains a list of MAC addresses that are to be quarantined. The DHCP server places those MACs into the quarantine subnet on the respective VLAN, no matter which VLAN the client is in. I don't think reservations would work: We currently have about 300 registered bad MACs and about 12 VLANs. I don't want to make 300 x 12 reservations nor have to add 12 reservations per new MAC address. Not to mention all of the quarantine subnets are /24s. We do not have NPS/NAC. You do not have to register your MAC address get network access. We use Cisco routers/switches. Thanks.

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• IP address reuse on macvlan devices

  - by Alex Bubnoff

  I'm trying to create easy to use and possibly simple testing environment for some product and got some strange behaviour of macvlan's. What I'm trying to achieve: make a toolset for one-line start/stop of lxc containers(via docker) bound to external ip(I have enough of it on host machine). So, I'm doing something like this: docker run -d -name=container_name container_image pipework eth1 container_name ip/prefix_len@gateway and pipework here does this: GUEST_IFNAME=ph$NSPID$eth1 ip link add link eth1 dev $GUEST_IFNAME type macvlan mode bridge ip link set eth1 up ip link set $GUEST_IFNAME netns $NSPID ip netns exec $NSPID ip link set $GUEST_IFNAME name eth1 ip netns exec $NSPID ip addr add $IPADDR dev eth1 ip netns exec $NSPID ip route delete default ip netns exec $NSPID ip link set eth1 up ip netns exec $NSPID ip route replace default via $GATEWAY ip netns exec $NSPID arping -c 1 -A -I eth1 $IPADDR And it works for first time per IP. But for second time and later packets for containers IP isn't getting into container, while all configuration seem fine. So it looks like this: External machine ? ping 212.76.131.212 ....silence.... Host machine root@ubuntu:~# ip link show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip addr show eth1 2: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:15:17:c9:e1:c9 brd ff:ff:ff:ff:ff:ff root@ubuntu:~# tcpdump -v -i eth1 icmp tcpdump: WARNING: eth1: no IPv4 address assigned tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 00:00:46.542042 IP (tos 0x0, ttl 60, id 9623, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2345, length 64 00:00:47.549969 IP (tos 0x0, ttl 60, id 9624, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2346, length 64 00:00:48.558143 IP (tos 0x0, ttl 60, id 9625, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2347, length 64 00:00:49.566319 IP (tos 0x0, ttl 60, id 9626, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2348, length 64 00:00:50.573999 IP (tos 0x0, ttl 60, id 9627, offset 0, flags [DF], proto ICMP (1), length 84) 5.134.221.98 212.76.131.212: ICMP echo request, id 6718, seq 2349, length 64 ^C 5 packets captured 5 packets received by filter 0 packets dropped by kernel 1 packet dropped by interface Host machine, netns of container root@ubuntu:~# ip netns exec 32053 ip link show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff root@ubuntu:~# ip netns exec 32053 ip addr show eth1 48: eth1@if2: mtu 1500 qdisc noqueue state UNKNOWN link/ether b2:12:f7:cc:a1:9d brd ff:ff:ff:ff:ff:ff inet 212.76.131.212/29 scope global eth1 inet6 fe80::b012:f7ff:fecc:a19d/64 scope link valid_lft forever preferred_lft forever root@ubuntu:~# ip netns exec 32053 tcpdump -v -i eth1 icmp tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes ....silence.... ^C 0 packets captured 0 packets received by filter 0 packets dropped by kernel So, can anyone say, what can it be? Can this be caused by not a bug in macvlan implementation? Is there any tools I can use to debug that configuration?

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• Windows server 2008R2 routing with single NIC

  - by Fabian

  I'm trying to duplicate a Linux server configuration to a windows server 2008R2 box. Basicaly this linux server acts as a router, but it is doing its job with only 1 interface (1 NIC). Here is the network configuration in place (I cannot change it) : INTERNET <== Router (local ip = 194.168.0.3) <== linux Server (ip : 194.168.0.2). The router is configured with a DMZ to 194.168.0.2, and only allow this IP to connect to internet (Cannot change this router configuration). The linux server is configured with a default gateway to 194.168.0.3, with the option : "Act as router". All other computer on the lan have this configuration (given by DHCP) : IP range : 194.168.0.X MASK : 255.255.255.0 Default gateway : 194.168.0.2 And everything is working perfectly. I'm trying to reproduce this way of routing with only one NIC from a windows server 2008R2, but it seems that you cannnot do it with only one NIC (all exemples I see are refering to 2 NIC with 2 different network). Does someone have an idea how to achieved this in Windows server 2008R2 ? Tx you for your help ! Fabian.

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• Virus / Malware: Explorer window with strange user logged into Hotmail

  - by abel

  I was looking into a PC, the user of which had complained that he couldn't connect to the internet and that the PC was experiencing random restarts. The PC runs WinXP SP3. On examination, I found that the Wireless Zero Configuration service was stopped. I enabled that and the internet was back on(The pc connected through wifi). Then I started firefox and browsed to gmail.com. I did not launch any other program, except for a few explorer windows. It was then I noticed a window had popped up(it was not a pop up). It had the explorer folder icon and instead of explorer folder contents, it showed a hotmail page, with a user named "Homer Stinson" logged in. The titlebar was empty and there were no toolbars. I asked the client whether this was his email id, which he said it was not. I opened task manager, which did not show this explorer window in it's Application tab. I switched back to the 'rogue' window and found that the hotmail settings page was now open, which later changed to the hotmail edit profile page for the same user. I was not clicking anything. Then suddenly the window closed. I checked the autorun locations, fired up a Malwarebytes Anti Malware scan which gave a clean result. The system also had an updated installation of AVG. I don't want a solution for this virus(?) problem. I asked this here because I wanted to know if somebody has come across something similar. What kind of malware can this be? The user had not seen a similar window before and I should have taken screenshots. (PS:Homer Stinson is an imaginary name. I searched for the other real name with some relevant keywords but could not come up with a virus/malware discussion post.) UPDATE: When I checked the PC later a DEP error had popped up closing which restarted the PC.

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• network latency, TCP and UDP packets

  - by user115848

  Hello recently my network has started to cause me lots of problems. I have a cable modem, connected to a tp-link router (with some port forwarding). Everything was working fine then i started to get lots of udp (port 53) "UNREPLIED" logs in the router. Now there are tcp UNREPLIED logs too. This is causing lots of latency and failed connections when trying to connect to different internet sites. Also, we run an openfire server for spark connections, and I believe its causing connectivity issues for some users who are trying to connect using Spark (some people connect fine, others don't). Please see screen shot below for packet logs. It has to be something internally, as I connected straight to the comcast modem and i was able to connect to the internet and various sites as normal. I tried to swap out the router with a different and got the same issue. I scanned both my internal dns servers for viruses or malware and it came up empty. Another anomaly is that when i try to connect to www.cnn.com, i get redirected to the different site. I scanned my own machine for hijacks. Not sure if this is related to the networking issue. Please let me know if you have any ideas for troubleshooting.

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• Connecting a network printer via a Thecus N2100 - works in Vista, not in Windows 7

  - by Jon Skeet

  I have a Lexmark E250d printer attached to a Thecus N2100 NAS. On Windows Vista I've managed to configure this using an "Internet" printer port with the URL of http://thecus:631/printers/usb-printer. I can add a printer in a similar way in Windows 7, but it never manages to print the test page. If I go to "Configure Port" in Vista, it just has "Security Options" - on Windows 7 it's asking about Raw mode vs LPR mode etc. On Vista I'm using an E250d-specific driver from Lexmark; on Windows 7 there's a Microsoft E250d driver, or a Universal PCL XL driver from Lexmark... I wouldn't expect this different to be related to the problem, but I thought I'd mention it anyway. (Lexmark doesn't have a Windows 7 E250d-specific driver as far as I can see.) Any suggestions? I was thinking of upgrading my main laptop from Vista to Windows 7, but I'd really like to get this sorted first... EDIT: If I connect to http://thecus:631/printers/usb-printer via Chrome while capturing with Wireshark, I get this response: HTTP/1.1 200 OK Date: Wed, 06 Jan 2010 16:47:23 GMT Connection: Keep-Alive Keep-Alive: timeout=60 Content-Language: C Transfer-Encoding: chunked Content-Type: text/html;charset=iso-8859-1 0 No idea what that's meant to be doing... EDIT: On further consultation, this would appear to be the Internet Printing Protocol which is layered on HTTP. Printing a test page successfully from Vista posts to that URL. Will attempt the same on Windows 7...

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• windows clients cannot get dns resolution until you open and close ipv4 properties page

  - by GC78

  This strange problem has started recently. Some windows clients cannot seem to get dns resolution to the internet after boot, and sometimes again at some point in the day. Internal hosts are also slow to resolve. trying to ping an interal host by name will take a long time for the hostname to resolve to ip address and trying to ping a website by name will fail to resolve. If you go into the tcp/ip v4 properties and view but not change anything, ok/close out of that then the client starts working fine, hostnames will resolve quickly. I have seen this happen on both Vista and W7 clients. ipconfig /all at a client experiencing this problem shows everything in order. proper ip addr, gateway, dns server, dns suffix ect.. ipconfig /dnsflush will not fix them, neither will /release and /renew the clients get their ip address, mask and dns server info from either one of 2 OES dhcp servers that assign addresses in different scopes in the same subnet. the internal dns server is a different OES dns server the default gateway is not assigned by the OES server but is statically put in at the client (only for those who need to get to the Internet for their job) flat network topology What can I do to get to the bottom of this? It only happens to a few of the client machines and typically the same ones. It started happening when we made a change to one of the DHCP scopes in iManager. Strangly this problem only happens to clients that get an IP address from the scope that we didn't make any changes to.

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• Setting "Run WWW service in IIS 5.0 isolation mode" does not persist in IIS 6

  - by Saul Dolgin

  Our IIS server was recently patched with the latest Microsoft Security Updates and since then, I am unable to enable the "Run WWW service in IIS 5.0 isolation mode" setting. This setting was enabled prior to patching and somehow changed during the updates. I have tried both using the IIS Manager console and the adsutil.vbs approach to change it. Either way, after resetting IIS for the change to take effect, when I go to verify that the isolation mode setting is enabled (true) I find that is reverts back to being disabled (false). Now... The patches have already been rolled back, however the setting still does not persist when I enable it. While I am trying to research the patches that were applied to see if there is a known issue (or perhaps a change in this setting's behavior) I was hoping someone else might have come across the same problem. Any help towards a workaround would be greatly appreciated! >cscript adsutil.vbs set W3SVC/IIs5IsolationModeEnabled TRUE IIs5IsolationModeEnabled : (BOOLEAN) True >iisreset Attempting stop... Internet services successfully stopped Attempting start... Internet services successfully restarted >cscript adsutil.vbs get W3SVC/IIs5IsolationModeEnabled IIs5IsolationModeEnabled : (BOOLEAN) False

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• Squid with mikrotik router

  - by niren

  I tried to connect squid3 in my network to use high anonymity proxy. This is how my network is right now WAN LINK | ------------- ----------------------------- | Mikrotik Box | | Ubuntu Server with squid3 | ------------- ----------------------------- | / | / ---------------------- | Switch ( Cheap one ) | ---------------------- | | | Client1 Client2 Client3 etc. after this setup I changed squid.conf in Ubuntu server as http_port 8080 acl localhost src xxx.xxx.xxx.xxx(Ubuntu server IP) acl to_localhost dst xxx.xxx.xxx.xxx(Mikrotik router gateway) I assume that redirected http from Mikrotik router will be redirect again to Mikrotik router. uncomment access log /var/log/squid3/access.log add visible_hostname myname save squid.conf and restart squid3 server. Then I have added nat rule in Mikrotik router ip/firewall/nat 1. add chain=dstnat src_address=xxx.xxx.xxx.xxx(ununtu server IP) dst-port=80 protocol=tcp action=accept 2. add chain=dstnat src_address=xxx.xxx.xxx.xxx/28(LAN address) dst-port=80 protocol=tcp action=dst-nat to-address=xxx.xxx.xxx.xxx(ununtu server IP) to-port=8080 now I can not able to access internet from client1 system, If I remove these two nat rule then I can access internet. what is wrong I have made?

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• Why won't dhclient use the static IP I'm telling it to request?

  - by mike

  Here's my /etc/dhcp3/dhclient.conf: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, netbios-name-servers, netbios-scope, interface-mtu; timeout 60; reject 192.168.1.27; alias { interface "eth0"; fixed-address 192.168.1.222; } lease { interface "eth0"; fixed-address 192.168.1.222; option subnet-mask 255.255.255.0; option broadcast-address 255.255.255.255; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; } When I run "dhclient eth0", I get this: There is already a pid file /var/run/dhclient.pid with pid 6511 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/eth0/00:1c:25:97:82:20 Sending on LPF/eth0/00:1c:25:97:82:20 Sending on Socket/fallback DHCPREQUEST of 192.168.1.27 on eth0 to 255.255.255.255 port 67 DHCPACK of 192.168.1.27 from 192.168.1.254 bound to 192.168.1.27 -- renewal in 1468 seconds. I used strace to make sure that dhclient really is reading that conf file. Why isn't it paying attention to my "reject 192.168.1.27" and "fixed-address 192.168.1.222" lines?

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• Cisco Catalyst 3550 + Alteon 184 Load-Balancing Issues...

  - by upkels

  I have just deployed a couple Cisco Catalyst 3550 switches, and a couple Alteon 184 Web Switches for load-balancing. I can ping all RIPs and VIPs to/from the Alteon. Topology Before: (server) <- (Alteon) <- (Internet) Topology Now: (server) <- (3550) <- Alteon <- (Internet) Cisco Port Configuration (Alteon Uplink Port): description LB_1_PORT_9_PRIMARY switchport access vlan 10 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 9 Configuration (VLAN 10 WAN): >> Main# /c/port 9/cur Current Port 9 configuration: enabled pref fast, backup gig, PVID 10, BW Contract 1024 name UPLINK >> Main# /c/port 9/fast/cur Current Port 9 Fast link configuration: speed 100, mode full duplex, fctl none, auto off Cisco Configuration (Load-Balanced Servers Port): description LB_1_PORT_1_PRIMARY switchport access vlan 30 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 1 Configuration (VLAN 30 LOAD-BALANCED LAN): >> Main# /c/port 1/cur Current Port 1 configuration: enabled pref fast, backup gig, PVID 30, BW Contract 1024 name LB_PORT_1 >> Main# /c/port 1/fast/cur Current Port 1 Fast link configuration: speed 100, mode full duplex, fctl both, auto on Each of my servers are on vlan 10 and 30, properly communicating. I have tried to turn on VLAN tagging on the Alteon, however it seems to cause all communications to stop working. When I tcpdump -i vlan30 on any of the webservers, I see normal ARP communications, and some STP communications, which may or may not be part of the problem: ... 15:00:51.035882 STP 802.1d, Config, Flags [none], bridge-id 801e.00:11:5c:62:fe:80.8041, length 42 15:00:51.493154 IP 10.1.1.254.33923 > 10.1.1.1.http: Flags [S], seq 707324510, win 8760, options [mss 1460], length 0 15:00:51.493336 IP 10.1.1.1.http > 10.1.1.254.33923: Flags [S.], seq 3981707623, ack 707324511, win 65535, options [mss 1460], len gth 0 15:00:51.493778 ARP, Request who-has 10.1.3.1 tell 10.1.3.254, length 46 etc... I'm not sure if I've provided enough information, so please let me know if any more is necessary. Thank you!

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• Unable to send mail to hotmail from rackspace cloud

  - by Jo Erlang

  I'm having issue sending mail from postfix on a rackspace cloud instance for my domain. Hotmail says "550 SC-001 (SNT0-MC4-F35) Unfortunately, messages from 198.101.x.x weren't sent. Please contact your Internet service provider since part of their network is on our block list. " Here is the mail log Sep 20 08:02:59 mydomain postfix/smtpd[1810]: disconnect from localhost[127.0.0.1] Sep 20 08:02:59 mydomain postfix/smtp[1814]: 59CFF4B191: to=<[email protected]>, relay=mx3.hotmail.com[65.55.92.184]:25, delay=0.19, delays=0.1/0.01/0.06/0.01, dsn=5.0.0, status=bounced (host mx3.hotmail.com[65.55.92.184] said: 550 SC-001 (SNT0-MC4-F35) Unfortunately, messages from 198.101.x.x weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL FROM command)) Sep 20 08:02:59 mydomain postfix/smtp[1814]: 59CFF4B191: lost connection with mx3.hotmail.com[65.55.92.184] while sending RCPT TO I have implemented rDNS, SPF and DKIM they all are looking fine. I have checked my IP and domain, on most of the spam black lists and it is listed as ok on those, (not listed as spamming IP) What should I try next?

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• Multiple IP's using one NIC connectivity problem - Windows

  - by Vincent

  I have a frame relay network that is directly connected to a GPRS network. I also have a ADSL high speed network and recently I have been trying to achieve the following network configuration using windows 7 (Also tried XP) with no success to date. On one server I have two NIC's NIC1 I would like the following two static IP address's 10.0.1.110 and 10.0.1.200 the cisco router has a default gateway of 10.0.1.1 the ADSL is DHCP. NIC1 and the cisco router do not have access to the internet. NIC2 is setup for DHCP with a primary DNS and secondary DNS configured to enable internet connectivity. With NIC1 all incoming TCP connections are from IP address's starting with 10.192.x.x I cannot establish a TCP connection to both 10.0.1.110 and 10.0.1.200. Its either one or the other. I have a static route implemented in windows of: route -p 10.192.0.0 mask 255.255.0.0 10.0.1.1 metric 1 I have tried leaving out the gateway in the NIC1 and many other combinations with no success. Can anyone please help? What am I doing wrong?

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• Google Chrome doesn't want to access Facebook

  - by Pieter van Niekerk

  I have been experiencing a bit of a problem with Chrome over the last couple of days where it doesn't want to access Facebook. When I open Chrome it works fine for a while and then if I were to refresh the page it would give me the Chrome 'This webpage is not available' message. This webpage is not available Google Chrome could not load the webpage because www.facebook.com took too long to respond. The website may be down, or you may be experiencing issues with your Internet connection. Here are some suggestions: Reload this webpage later. Check your Internet connection. Restart any router, modem, or other network devices you may be using. Add Google Chrome as a permitted program in your firewall's or antivirus software's settings. If it is already a permitted program, try deleting it from the list of permitted programs and adding it again. If you use a proxy server, check your proxy settings or contact your network administrator to make sure the proxy server is working. If you don't believe you should be using a proxy server, adjust your proxy settings: Go to the wrench menu Options Under the Hood Change proxy settings... LAN Settings and deselect the "Use a proxy server for your LAN" checkbox. This problem only persists when using the proxy and doesn't occur at all when not on the proxy. I have also tried different browsers (IE9 and Firefox 9.01) but it doesn't occur in any of them. This problem goes away for a while when I restart Chrome, only to happen again a couple of minutes later. I have tried deleting the cookies for Facebook without restarting Chrome, but to no avail. I am using Windows7 with Chrome 17

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• Is encryption really needed for having network security? [closed]

  - by Cawas

  I welcome better key-wording here, both on tags and title. I'm trying to conceive a free, open and secure network environment that would work anywhere, from big enterprises to small home networks of just 1 machine. I think since wireless Access Points are the most, if not only, true weak point of a Local Area Network (let's not consider every other security aspect of having internet) there would be basically two points to consider here: Having an open AP for anyone to use the internet through Leaving the whole LAN also open for guests to be able to easily read (only) files on it, and even a place to drop files on Considering these two aspects, once everything is done properly... What's the most secure option between having that, or having just an encrypted password-protected wifi? Of course "both" would seem "more secure". But it shouldn't actually be anything substantial. I've always had the feeling using any kind of the so called "wireless security" methods is actually a bad design. I'm talking mostly about encrypting and pass-phrasing (which are actually two different concepts), since I won't even consider hiding SSID and mac filtering. I understand it's a natural way of thinking. With cable networking nobody can access the network unless they have access to the physical cable, so you're "secure" in the physical way. In a way, encrypting is for wireless what building walls is for the cables. And giving pass-phrases would be adding a door with a key. So, what do you think?

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• Access router set up as a bridge behind another router

  - by Alari Truuts

  I have a problem my ISP is refusing to help me with, even though they put up the whole system. Specifications: There's a Thomson TG784 router through which the internet comes in to the building, Behind that (for some reason) is a Juniper NetScreen 5XT - 105 Firewall/Router? which leads to an AMX nxa-enet24 switch that carries the connections all over the building and a series of Apple AirPorts for wifi. Problem: The first router (Thomson) is required for ipTV (by Elion). The tv or ipTV box has to be connected straight to the Thomson router. My service provider cannot see the Thomson router from their side, but see the Juniper, so we might think the Thomson has been configured as a bridge. I need a way to access the Thomson router and see it's configurations, because currently, when connecting a Samsung tv to that router (with elion app for ipTV viewing) or even a computer, it cannot access the internet and even if it could, it would update the Thomson router software, losing it's configurations which I need to preserve. I'm unable to find out the Thomson routers ip address to connect to it, and when directly conencting with a cat5 cable, it doesn't give me an ip address. Hope someone can show me the correct direction for solving my issue. Thank you all for reading, and I appreciate any help, Alari Truuts

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• Web Application Publishing on Citrix with Restricted Access

  - by Kanini

  We have a Citrix setup enabling users to access our applications from home. Basically, they login to our site using the Windows Authentication. Once, the are successfully logged in, they see the following icons Desktop - Full Screen (which provides them the Desktop as they would see when the login in our office) We now have a requirement where we would like to publish a web application, hxxp://ourlibrary on Citrix with the following security requirement. (this application is already accessible if the users launch the desktop and launch IE within it and navigate to it) The requirement is this - When the are successfully authenticated to our site, they should be able to see The Internet Explorer icon only, NOT the Dekstop - Full Screen icon. On clicking on the icon, Internet Explorer should open up and should automatically navigate to hxxp://ourlibrary They should not be able to access any other URL, such as Google, Hotmail etc., They should not be able to go FileOpen and Browse They should not be able to do FileSave and Browse In effect, they should be able to view the site and that should be it. Any ideas on how to accomplish the security feature? We have already published the application.

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• How do i set up a fully featured small business network?

  - by JoshReedSchramm

  This has the possibility to be a very large question but I recently acquired a few rack mount servers and the hardware necessary to run them. Unfortunately I'm a programmer with very little understanding of how to set up a good working network so I'm hoping someone on here might be able to help. What I want to do is run a domain with a series of subdomains which would all be externally accessible. The setup would live inside my home and my internet connection is your run of the mill cable model (which means a dynamic IP) I want to be able to set up a couple site, specifically: www.mycompany.com (mycompany.com with no subdomain would redirect to this) build.mycompany.com (for my continuous integration server) ruby.mycompany.com (for ruby projects) win.mycompany.com (for windows project) etc. Additionally this is still my home network so our personal machines need to be able to get on via wifi with at least the same security we have now through an out of the box router from best buy. I'm thinking i need a DNS server, DHCP server and one of those would run either no-ip or dyndns to accommodate the dynamic ip. I don't necessarily need mail but it might be helpful to have some sort of mail server i could use for testing, it doesn't need to get out to the greater internet though. So how do i set up this kinda of network? tl;dr Need to know how to set up your standard office style network in my home off my normal consumer level cable modem connection.

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• Can't log in using second domain controller when first DC is unreachable

  - by rbeier

  Hi, We're a small web development company. Our domain has two DCs: a main one (BEEHIVE, 192.168.3.20) in the datacenter and a second one (SPHERE2, 10.0.66.19) in the office. The office is connected to the datacenter via a VPN. We recently had a brief network outage in the office. During this outage, we weren't able to access the domain from our office machines. I had hoped that they would fail over to the DC in the office, but that didn't happen. So I'm trying to figure out why. I'm not an expert on Active Directory so maybe I'm missing something obvious. Both domain controllers are running a DNS server. Each office workstation is configured to use the datacenter DC as its primary DNS server, and the office DC as its secondary: DNS Servers . . . . . . . . . . . : 192.168.3.20 10.0.66.19 Both DNS servers are working, and both domain controllers are working (at least, I can connect to them both using AD Users + Computers). Here are the SRV records that point to the domain controllers (I've changed the domain name but I've left the rest alone): C:\nslookup Default Server: beehive.ourcorp.com Address: 192.168.3.20 set type=srv _ldap._tcp.ourcorp.com Server: beehive.ourcorp.com Address: 192.168.3.20 _ldap._tcp.ourcorp.com SRV service location: priority = 0 weight = 100 port = 389 svr hostname = beehive.ourcorp.com _ldap._tcp.ourcorp.com SRV service location: priority = 0 weight = 100 port = 389 svr hostname = sphere2.ourcorp.com beehive.ourcorp.com internet address = 192.168.3.20 sphere2.ourcorp.com internet address = 10.0.66.19 Does anyone have any ideas? Thanks, Richard

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• Connecting 2 different subnet masks

  - by Jonathan

  I'm no network genius, but I have managed to get most things running. I get confused about subnets and gateways though. We have an office server connected to around 20 PC's that all communicate fine. We have just gotten a cutting machine that won't connect to our network. The server has DHCP, but that fails on the cutting machine, so I've been trying to set the IP manually. Server details are as follows: IP: 10.1.1.12 SUBNET: 255.255.255.0 GATEWAY: 10.1.1.1 Internet connection is via the modem which is 10.1.1.1 An office PC is ussually set up through DHCP and has the following settings: IP: 10.1.1.36 SUBNET: 255.255.255.0 GATEWAY: 10.1.1.1 PRIMARY DNS: 10.1.1.12 Cutting Machine computer has 2 network ports. 1 is specifically for the communication between the PC and the cutting machine. It's details must be as follows: IP: 10.100.100.2 SUBNET: 255.255.255.252 GATEWAY: BLANK The other network port need to connect to the server. I was told that the IP and SUBNET need to be as follows: IP: 10.100.100.1 SUBNET: 255.255.255.252 GATEWAY: ?? How can I connect this port to the server and/or the internet. If anyone can offer assistance, it would really be appreaciated.

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• Using modem for sending voice recording

  - by ircmaxell

  I've got an interesting one for you. I've been going over my server monitoring and notification systems (Nagios based), and realized that if our internet connection goes down, there's no way for it to notify me. I already have a modem listening (Via CentOS 5) on a spare POTS line so that I can dial-in in case our internet goes down. I was wondering if I could come up with a script (Shell, Python, etc) that can dial out and play a recorded message (wave file I'm guessing) when it's picked up. I know Windows supports voice calls over a voice modem, I was wondering if a solution existed for Linux... I know asterisk can probably do it, but isn't that overkill (A full blown VOIP system just for a notification mechanism that will hopefully never be used)? And wouldn't it interfere with the modem's primary function as a backup network interface (PPP spawned via mgetty)? I've done some searching, and haven't really come up with much. I know how to dial out from the command line, but only as a modem (not as voice). Worst case, I could set it up to dial out as a modem, and then just realize that if I get a call with modem sounds from that number that it's the notification... Any insight would be appreciated...

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• Windows server 2008R2 routing with single NIC

  - by Fabian

  I'm trying to duplicate a Linux server configuration to a windows server 2008R2 box. Basicaly this linux server acts as a router, but it is doing its job with only 1 interface (1 NIC). Here is the network configuration in place (I cannot change it) : INTERNET <== Router (local ip = 194.168.0.3) <== linux Server (ip : 194.168.0.2). The router is configured with a DMZ to 194.168.0.2, and only allow this IP to connect to internet (Cannot change this router configuration). The linux server is configured with a default gateway to 194.168.0.3, with the option : "Act as router". All other computer on the lan have this configuration (given by DHCP) : IP range : 194.168.0.X MASK : 255.255.255.0 Default gateway : 194.168.0.2 And everything is working perfectly. I'm trying to reproduce this way of routing with only one NIC from a windows server 2008R2, but it seems that you cannnot do it with only one NIC (all exemples I see are refering to 2 NIC with 2 different network). Does someone have an idea how to achieved this in Windows server 2008R2 ? Tx you for your help ! Fabian.

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• Proxy settings in Java mail API

  - by coder

  I've written a piece of java code where user1 sends email to user2. I'm behind a proxy and hence I'm getting a javax.mail.MessagingException. How do I solve this problem? Here is the code- import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class Mail { public static void main(String[] args) { final String username = "[email protected]"; final String password = "abc"; Properties props = new Properties(); props = System.getProperties(); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.host", "smtp.gmail.com"); props.put("mail.smtp.port", "587"); Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); try { Message message = new MimeMessage(session); message.setFrom(new InternetAddress("[email protected]")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("[email protected]")); message.setSubject("Testing Subject"); message.setText("Dear Mail Crawler," + "\n\n No spam to my email, please!"); Transport.send(message); System.out.println("Done"); } catch (MessagingException e) { throw new RuntimeException(e); } } }

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• Connection refused in ssh tunnel to apache forward proxy setup

  - by arkascha

  I am trying to setup a private forward proxy in a small server. I mean to use it during a conference to tunnel my internet access through an ssh tunnel to the proxy server. So I created a virtual host inside apache-2.2 running the proxy, the proxy_http and the proxy_connect module. I use this configuration: <VirtualHost localhost:8080> ServerAdmin xxxxxxxxxxxxxxxxxxxx ServerName yyyyyyyyyyyyyyyyyyyy ErrorLog /var/log/apache2/proxy-error_log CustomLog /var/log/apache2/proxy-access_log combined <IfModule mod_proxy.c> ProxyRequests On <Proxy *> # deny access to all IP addresses except localhost Order deny,allow Deny from all Allow from 127.0.0.1 </Proxy> # The following is my preference. Your mileage may vary. ProxyVia Block ## allow SSL proxy AllowCONNECT 443 </IfModule> </VirtualHost> After restarting apache I create a tunnel from client to server: #> ssh -L8080:localhost:8080 <server address> and try to access the internet through that tunnel: #> links -http-proxy localhost:8080 http://www.linux.org I would expect to see the requested page. Instead a get a "connection refused" error. In the shell holding open the ssh tunnel I get this: channel 3: open failed: connect failed: Connection refused Anyone got an idea why this connection is refused ?

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