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Most awesomely bad hack

- by Zypher

As I sit watching one of my latest dirty dirty hacks run, I started wondering what kind of dirty hacks you have created that are so bad they are awesome. We all have a few of them in our past - and they are probably still running in production somewhere, chugging along somehow still working. Which reminds me of the hack we had to put into place when we were moving data centers. Our IVRs had to keep running, as the data center we were moving from was the primary DC, and the new Primary wasn't quite ready to take traffic. So what do we do. Well we answer the calls in DC1, then ship the sip stream over the internet to DC2 1900 miles away ... that just felt oh so wrong. So the question is, what is one (or more) of your awesomely bad hacks?

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"Request not supported" in IPCONFIG (WinXP SP3)

- by pablog

In a customer PC (Windows XP SP3), suddenly the network went down: the network adapter appears with an error mark. I replaced the network card, but the new one does the same thing. When I enter IPCONFIG, XP shows this error (in standard and safe mode): Internal error occurred Request not supported Unable to query host name If I start the system with a boot cd the PC runs fine, so the problem seems to be in the XP installation. I tried: uninstalling and reinstalling the network card in the Device Manager disabling and reenabling the card netsh int ip reset netsh winsock reset catalog and a couple of "reset" programs (WinsockxpFix.exe, etc) with no luck. Is there any way to fix it without reinstalling XP? TIA, Pablo

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Printing to shared printers across VPN

- by CYMR0

I have a program that prints labels at five remote sites. Two sites, aren't working, but the rest are with an identical (as far as I can tell) setup. Using Wireshark, I have determined that the handshaking all goes well, but after the "Open Print File Response" the packet that is sent from the server, doesn't reach the client. But I'm a bit at a loss as to where I go from here. I know the port the packet was sent on (445) isn't being blocked, the RST packet gets sent on the same port and that gets there fine. It's also weird that the three out of five sites are working fine. This has been up and running for years without issue, all that we have changed is our connectivity (from DSL to bonded DSL). But this traffic is over a VPN - so it can't be the ISP interfering either can it? I'm totally stuck, and any help would be much appreciated. Thanks!

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How to run a DHCP service on Windows 7 Home

- by Joshua Lim

I'm trying to setup a DHCP server on Windows 7 Home, tried using a couple of freeware which I found on the Internet but none seemed to work. What I did: On the Windows 7 machine which I install the DHCP Server with the range 192.168.1.12-192.168.1.256. I set the Gigabit Ethernet adapter to a static IP address of 192.168.1.11 and subnet mask of 255.255.255.0. When I did an IP config, it showed. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet Physical Address. . . . . . . . . : 8C-73-6E-75-A7-56 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::196d:b6bb:8f93:2555%12(Preferred) IPv4 Address. . . . . . . . . . . : 192.168.1.11(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled I connected another Window 7 machine to the "DHCP server" using a cross cable and set network adapter on that machine to automatically detect IP address. The client fails to acquire the correct IP address from the DHCP server and showed the autoconfigured IPv4 address instead. Here's the information returned by config /all on the client machine. Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Atheros AR8152/8158 PCI-E Fast Ethernet Controller (NDIS 6.20) Physical Address. . . . . . . . . : 54-04-A6-40-96-4B DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Link-local IPv6 Address . . . . . : fe80::4885:4082:5572:5a85%12(Preferred) Autoconfiguration IPv4 Address. . : 169.254.90.133(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DHCPv6 IAID . . . . . . . . . . . : 341050534 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-54-78-12-00-08-CA-46-4C-5A DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1 fec0:0:0:ffff::2%1 fec0:0:0:ffff::3%1 NetBIOS over Tcpip. . . . . . . . : Enabled DHCP client are running on both machines. I've tried many times but failed. Googling also returned no useful information for my scenario. Have I missed out any step? Thanks.

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Network Diagramming software options?

- by Zak

I've used The Dude to map my network, but I can only export the network map as a graphics file. I've also used Dia and Vision to manually diagram portions of my network. Does anyone out there have a solution where I can do automatic network mapping using a tool like "The Dude", then pull that file over to a manually editable format for cleaning up and/or enhancing in Visio or Dia?

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How to bypass vpn talking to VMWare Guest?

- by marc esher

Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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flowchart for debugging a slow/unresponsive server

- by davidosomething

So the server is slow: Roll back to the previous known working build - Success? Code problem - Fail? Go on. Ping ip address - Success? maybe a DNS problem, go on. - Fail? Server or connection problem, go on. Ping and tracert your domain.com from inside your network - previous success - fail: DNS problem - success? go on. - previous fail and: - Fail? Go on, could be you or network. - Success? Go on. Try it from outside your network (http://centralops.net/co/) - Fail? The server's network connection sucks. - Success? If inside network was fail, your network sucks. Check the server load: CPU/RAM usage. Is it overloaded? - Yes. Who's the culprit? Kill some processes/reboot. - No? Go on. what other steps should i add?

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Test server on a local network with XAMPP

- by hopscotch1978

Hi, I'm not very proficient with networks and could use some help. I've got a Win 7 desktop with XAMPP which acts as my local dev machine. I've configured a virtual host on the desktop which I'm able to access fine. If I'm understanding things correctly, the virtual host uses port 80 (<VirtualHost 127.0.0.1:80>). I've just tried to configure a separate Win XP laptop on the local wireless network to connect to the main desktop for testing purposes. I've added the IP address and virtual host name to my Hosts file on the laptop. My virtual host is imaginatively named "virtualhost1". When I type this into my laptop browser, it connects correctly to the main desktop and I get the XAMPP welcome screen. But I can't seem to get to the actual site, just the XAMPP welcome screen. It kind of jumps the browser to http://virtualhost1/xampp/. I think it's a port issue of some sort but I have no idea how to resolve it. I would get the same XAMPP welcome screen on my desktop if I omitted ":80" from the virtual host declaration. On my main desktop, typing "virtualhost1" to the browser address bar gives me the site correctly, not the XAMPP welcome screen. Help would be appreciated. Thank you.

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How to ping ip dslam which is in other subnet

- by vito

I want to ping ip dslam, which is in another subnet The connection is like this: MyPc-----Rj45----------Adsl2+ Modem---------Rj11-------Dslam 192.168.1.4----192.168.1.1---172.80.1.3-------------172.80.1.2 -----------------LanSide-----------WanSide--------------------- The modem is set to Static Ip Address Encapsulation. How can I ping ip dslam with this setup, or what do I need to change about the architecture?

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open source solution to a gateway for a network of a housing cooperative of 150 people

- by SirDinosaur

i just inherited a barely functioning network for a student housing cooperative of about 150 people. in it's current state, as i understand it from the previous person in charge of the network, we have working wireless access points and working ethernet cords going to working gigabit switches going to a barely functioning gateway (right now a simple home router) to one of three possible outbound connections. it is possible to connect to the network through the wireless or ethernet, but especially during peak hours, packets / connections are likely dropped or otherwise get no response. my intuition tells me to replace the gateway with something that can handle multiple outbound connections (WAN) and one inbound connection (LAN), while the rest of the network seems suitable for now. i'm somewhat knowledgable in Linux (been using Debian after first Arch Linux) and i want to use as much open source as possible, but i'm confused whether or not a simple server that i could easily understand will work for this situation. do i need specialized hardware to handle the switching more effectively? if so, what are my options? (i found this, thoughts?) or if a Debian server would work, anything else i should about the specs required for this type of server? also links to any useful information on using open source to maintain this type of network would be most appreciated. <3 P.S. crossposted http://redd.it/yybp2.

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LXC container can only access host via bridge

- by vitaut

I have an LXC container with i686 Ubuntu 12.04 running on a x86_64 Ubuntu 12.04 host. I've set up a bridge using instructions here. However the ping from the container only goes through to the host and not to other machines on the local network. Similarly only the host and not the other machines see the container OS. The host's /etc/network/interfaces file looks as follows: auto lo iface lo inet loopback iface eth0 inet manual auto br0 iface br0 inet dhcp bridge_ports eth0 bridge_fd 0 bridge_maxwait 0 The container's /etc/network/interfaces file looks as follows: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp And here's the relevant part of the container's config: lxc.network.type=veth lxc.network.link=br0 lxc.network.flags=up Any ideas what I'm doing wrong? Additional info: The output of iptables-save on host: $ sudo iptables-save # Generated by iptables-save v1.4.12 on Sat Oct 26 06:06:48 2013 *filter :INPUT ACCEPT [6854:721708] :FORWARD ACCEPT [4067:538895] :OUTPUT ACCEPT [4967:522405] COMMIT # Completed on Sat Oct 26 06:06:48 2013 # Generated by iptables-save v1.4.12 on Sat Oct 26 06:06:48 2013 *nat :PREROUTING ACCEPT [82235:21547307] :INPUT ACCEPT [16:1070] :OUTPUT ACCEPT [9386:583359] :POSTROUTING ACCEPT [14693:1291952] -A POSTROUTING -s 10.0.3.0/24 ! -d 10.0.3.0/24 -j MASQUERADE COMMIT # Completed on Sat Oct 26 06:06:48 2013 The output of brctl show on host: $ brctl show bridge name bridge id STP enabled interfaces br0 8000.080027409684 no eth0 vethBkwWyV The output of ifconfig br0 on host: $ ifconfig br0 br0 Link encap:Ethernet HWaddr 08:00:27:40:96:84 inet addr:192.168.1.11 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe40:9684/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:232863 errors:0 dropped:0 overruns:0 frame:0 TX packets:59518 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:34437354 (34.4 MB) TX bytes:198492871 (198.4 MB) The output of ifconfig eth0 on host: $ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 08:00:27:40:96:84 inet6 addr: fe80::a00:27ff:fe40:9684/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:299419 errors:0 dropped:0 overruns:0 frame:0 TX packets:203569 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:59077446 (59.0 MB) TX bytes:372056540 (372.0 MB) The output of ifconfig eth0 on container: $ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:16:3e:74:08:2b inet addr:192.168.1.12 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::216:3eff:fe74:82b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:81 errors:0 dropped:0 overruns:0 frame:0 TX packets:113 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8506 (8.5 KB) TX bytes:9021 (9.0 KB)

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Step by step USB Wi-Fi driver install for mint 15

- by Andy

I'm running Linux mint 15 32 bit on a Dell inspiron 2200. I have given up trying to get the Broadcom BCM4318 built in wireless working, so bought a Dynamode Nano 802.11n wireless USB adapter. It came with an install disc. I have no idea how to install it. Could someone please point me in the right direction for full, idiot proof, step by step instructions. I've been using Ubuntu 12.04 but am totally new to mint 15, so best to assume no previous knowledge. Thanks in advance.

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OpenVPN/Tunnelblick through wireless router, no connection.

- by Oscar

I'm using OpenVPN with Tunneblick on my Macbook Pro to access a server on my job. I't works fine, but i can't get it working with my Netgear WGT624v3 wireless router. I get this warning: WARNING: potential route subnet conflict between local LAN [192.168.1.0/255.255.255.0] and remote VPN [192.168.1.0/255.255.255.0] Someone told me that i should "port forward" on my router, but i can't figure out the right settings. Also not shure i'm doing it right.

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Cannot browse remote networks even with WINS configured

- by paradroid

As the NetBIOS protocol acts on Layer 2 and so is not routable, In order to enable network browsing of remote networks, WINS has been installed and configured on two domain controllers, both of which are on different networks. The WINS servers seem to be replicating with eachother, and each has 127.0.0.1 set as the Primary WINS Server in each of their LAN interface properties, with nothing entered for Secondary WINS Server. The DC which holds the PDC Emulator FSMO role has the Computer Browser service running and set to Auto start, and it has the WINS/NBT node type network setting at 0x8 (H-node - Hybrid node). Remote network browsing does not work. Is the WINS/NBT node type correct for this scenario? The reason why I think it may not be the right one is because I set the DHCP Server's 046 WINS/NBT node type option to 0x8 as well, after which the DHCP clients started to disappear from the Network folders. When that option is not set, does it default to B-node (Broadcast node)? Or could it be a problem with the WINS servers setup?

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Configuring https access on HP A5120 Switch

- by GerryEgan

I am trying to configure HTTPS management on a HP a5120 switch running Version 5.20.99, Release 2215 and not having much luck. I have followed the manual by creating an SSL policy first and then enabling the HTTPS server with the SSL policy: ssl server-policy sslpol ip https ssl-server-policy sslpol ip https enable When I try and log onto the switch with Google Chrome I get the following error: Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error. When I look this up I have found references to errors due to TLS being used in SSL. I can find no way to specify the SSL version in the server policy. The manual has a configuration example that uses MSCEP to retrieve a certificate but in Windows 2008 R2 that feature is only available in Enterprise and Datacentre editions which I don't have. I have SSH configured and it is using a locally generated certificate so I'm not sure if I can use that but I'd like to if possible. Has anybody been able to setup HTTPS management on HP A series switches without MSCEP? Any and all help appreciated! here is a copy of my config with the interfaces removed: version 5.20.99, Release 2215 # sysname MYSYSNAME # irf domain 10 irf mac-address persistent timer irf auto-update enable undo irf link-delay # domain default enable system # telnet server enable # vlan 1 # vlan 100 description Management # radius scheme system primary authentication 127.0.0.1 1645 primary accounting 127.0.0.1 1646 user-name-format without-domain # domain system access-limit disable state active idle-cut disable self-service-url disable # user-group system group-attribute allow-guest # local-user admin password cipher authorization-attribute level 3 service-type ssh telnet terminal service-type web # stp enable # ssl server-policy sslpol pki-domain MYDOMAIN # interface NULL0 # interface Vlan-interface199 ip address 192.168.199.140 255.255.255.0 # interface GigabitEthernet1/0/1 poe enable stp edged-port enable # interface Ten-GigabitEthernet2/1/2 # dhcp-snooping # ntp-service unicast-server 192.168.1.71 # ssh server enable # ip https ssl-server-policy sslpol ip https enable # load xml-configuration # user-interface aux 0 1 user-interface vty 0 15 authentication-mode scheme

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Vlan and Switch setting - dummy

- by Andras Sebestyen

I need to speak tomorrow the network engineer and I would like to understand his so apologise for the Dummy question: In the school we have a cab with a 24 port Netgear manageable switch with an admin and curriculum VLAN settings. Usually, as I over heard, in the morning and around 4.30pm there are a slowdown period on the computers which connect to this switch. No one could track this back yet. Questions: What is the best way to track back this slowdown Would it be a temporary solution to physical separate the two network with 2 switches If that would work how can I link them together to be able to see the curriculum from the admin side. Do I need an extra router then? Too many questions but I have no clue where to start and the gentleman will be paid by hours... can you see where I am coming from?:) Could you guide me in the right direction please? Any comment would be appreciated and please send links if you down vote the question:)

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Teamed network cards on a Proliant Server

- by Matt

We have 4 network cards in a Proliant server with Server 2008R2 running Exchange 2010, with 1 card set to a static IP address and the other 3 set to DHCP. I just need some clarification as I have not teamed network cards. Do all the network cards need to have a static IP when I set as a team. The connection that has the static IP is the IP that I need to use for the Server. Is it possible to set the teamed cards to the same static IP or do I have to change the static IP to another IP then use it for the teamed IP? I will be using HP Network Configuration Utility to set this up.

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How to block annoying facebook and other social network widgets

- by lesmana

We have facebook buttons, twitter buttons, linkedin buttons, google+ buttons, stumbleupon buttons, younameit buttons. These social network buttons and widgets are creeping up the internets like the plague. Sometimes even with cool javascript popups which obscure content if moused over. How can I get rid of them? I mean stuff like this: and this: and last but not least, this: How can I get rid of them?

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Ubuntu second static IP, ifconfig, /etc/network/interfaces

- by Schmoove

I would like to add a second static IP to my local Ubuntu 11.10 desktop machine and have it automatically available after rebooting. So far I am successfully using ifconfig to to temporarily set up an alias for my primary network interface: # ifconfig eth1:0 192.168.178.3 up # ifconfig eth1 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.2 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::ca60:ff:feef:a3d9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:61929 errors:0 dropped:0 overruns:0 frame:0 TX packets:64034 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:45330863 (45.3 MB) TX bytes:28175192 (28.1 MB) Interrupt:42 Base address:0x4000 eth1:0 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.3 Bcast:192.168.178.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:42 Base address:0x4000 However, when I add the following to /etc/network/interfaces, the alias is not up and running as expected after a reboot: # vi /etc/network/interfaces auto eth1:0 iface eth1:0 inet static address 192.168.178.3 netmask 255.255.255.0 I would like to know what to configure to get this to work. As a side note, I am running gnome shell.

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How to get Tenda W322U V2.0 Wireless adapter running on Windows 7?

- by dircowander

My Tenda W322U V2.0 Wireless USB Adapter used to work with Ralink drivers and I can't make it work on the new Windows 7. Every time the network adapter is booted, it keeps looking for a driver update and after updating, no wireless connection shows in the launcher in the panel. I was wondering whether the adaptor uses the Ralink chipset at all. Is there a version available with a wider choice of drivers?

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What does this UDP Packet mean ?

- by asksuperuser

I'm total newbie at tcp/ip and I was experimenting with Wireshark. What this mean: 1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500 In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?

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Using multiple wifi connections simultaneously on Windows

- by Salman A

My office PC has a one wireless network card and there are three available wifi connections: primary, backup and backup of a backup (grin). Is it possible for me to use all three simultaneously. If this results in an increase in bandwidth that's well and good, but primary reason is every now and then one of the network fails and i have to switch back and forth between the available networks by disconnecting, viewing available networks and connecting to next one hoping its running. Do i need more than one network card or a software e.g. a proxy.

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Using multiple wifi connections simultaneously on Windows

- by Salman A

My office PC has a one wireless network card and there are three available wifi connections: primary, backup and backup of a backup (grin). Is it possible for me to use all three simultaneously. If this results in an increase in bandwidth that's well and good, but primary reason is every now and then one of the network fails and i have to switch back and forth between the available networks by disconnecting, viewing available networks and connecting to next one hoping its running. Do i need more than one network card or a software e.g. a proxy.

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WIFI: iPhone/iPad getting much slower bandwidth than laptop

- by Sam

I just got cable internet installed (Comcast). It claims that my down speed should be 25mbit. Over wifi, I get close to that on my laptop, but only about 8 on average with my iPhone/iPad. I'm using testmy.net in the browser on all devices. I have an ARRIS / Motorola SurfBoard SB6141 DOCSIS 3.0 Cable Modem and a Medialink Wireless N Broadband Router. I read somewhere that disabling WMM and the firewall on the router would help (is this even a safe idea?). I've tried both, and neither seem to make much of a difference, if any at all (sidebar: I've noticed that my download speeds vary wildly with cable internet... on my laptop, I'll get 12 down, then 22 five minutes later. Is this typical for cable internet?).

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How do I configure tinydns (with fefe's IPv6 patch) to listen on IPv6 address?

- by Christian Hudon

I'm setting up my network to support IPv6. I have static IPv6 addresses assigned to each interface of my router, and radvd advertising different prefixes on each interface. The next step would be to get my dnscache (from djbdns) working on IPv6. Said dnscache has fefe's IPv6 patch applied, so I assume it should work with IPv6. However, I can't find any documentation online on how to make the patched dnscache listen on IPv6. How do I configure tinydns and dnscache to listen on IPv6 too?

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