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• Is 192.168.122.1 a valid IP?

  - by Louise Hoffman

  From my understanding the networks is as follows Class A: 10.0.0.1 - 10.255.255.254 Class B: 172.16.0.1 - 172.16.255.254 Class C: 192.168.0.1 - 192.168.0.254 But then I look at ifconfig virbr0 on my Linux computer: virbr0 Link encap:Ethernet HWaddr 42:40:99:CB:02:7F inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:16 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:2842 (2.7 KiB) Here the IP address is 192.168.122.1. Is that an allowed IP? And if so, is 192.168 than actually a Class B network?

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• DHCP Relay setup in ubuntu server

  - by jerichorivera

  I have a network appliance (QNO) that works as traffic load balancer and dhcp server. I would like to add a linux server in between the network appliance and the client computers. The linux server will be used to monitor bandwidth usage. My problem is I still want DHCP to be served by the network appliance so that load balancing will still work efficiently. We are afraid that if we setup the linux server as the DHCP server the network appliance will not be able to load balance the traffic if it only sees the linux server as a single client connecting to it. I've been searching all over for a tutorial on how to setup DHCP relay but have not found any. How do I setup DHCP relay on my linux server given there are two NICs attached to it, one connects the linux server to the network appliance and the other connects the linux server to the client computers. EDIT Router (DHCP) ---- [eth0] Linux Server (Relay agent) [eth1] ----- PC (network) Router IP is 192.168.0.100 eth0 is on DHCP eth1 is static 192.168.2.11 (if I need to change this I can) Tried to do dhcrelay -i eth1 192.168.0.100, but the PC was not getting any DHCP lease from the DHCP router. I might be missing something here.

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• Find computer names on a private network (with nmap?)

  - by paracaudex

  On a LAN, I want to find out the names of all the connected computers using a cross-platform program, preferably nmap. I know I can do nmap -sn xxx.xxx.xxx.xxx/24 (where xxx.xxx.xxx.xxx is a local IP address) to find hosts which are up, but how do I find the computers' hostnames? Do they broadcast this in a way that I can find using nmap? UPDATE: It looks like Angry IP Scanner can do this. How does it do this? Can I replicate it with nmap?

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• How do I access my samba drive through several layers of network topology?

  - by stephenmm

  I have a new windows 7 Home Premium machine that is in a different room than my main computer area. As such I have to use a bridge and another router. Everything is working wonderfully except I cannot access the SAMBA drive with the new machine. I know that SAMBA is accessible as an older WinXP machine can access it. A picture of my network would probably be helpfull: To ISP | | +---------------------------+ | WAN | | Cable Modem | | (2WIRE678) | | | | | +---------------------------+ | +---------------------------+ | | (|) (|) +-----------+ | Belkin Router | | | | Wireless | | (F5D) |--+ +--| WinXP | | | |SAMBA USER | | | +-----------+ +---------------------------+ | | | | +------------+ | | Ubuntu | | | Apache + | | |SAMBA Server| | +------------+ | | +---------------------------+ | | | Netgear Bridge | | (XET1001) | | | +---------------------------+ # # +---------------------------+ | | | Netgear Bridge | | (XET1001) | | | +---------------------------+ | +---------------------------+ | | | D-Link Router | | (DI-524) | | | | | +---------------------------+ | | | | +-----------+ | | | Win7 | |SAMBA USER?| +-----------+ More interesting data points: 1. I can ping the SAMBA server from the Win7 machine locally (Ie. 192.168.2.2) 2. I can access the webserver from the Win7 machine locally (Ie. 192.168.2.2) 3. I followed the advice to get Win7 and SAMBA to play nice: http://www.tannerwilliamson.com/2009/09/windows-7-seven-network-file-sharing-fix-samba-smb/ Sorry for being so long winded but it is kind of complex and I am really at a loss as to how to fix it. If any of you have some suggestions I would love to hear it!

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• How do I replicate Gmail filtering (forwarding mostly)?

  - by projectdp

  I have reached the limits of Gmail forwarding. Before there was no need to verify forwarding addresses. It's a problem for me now because the addresses I want to forward to are not natural inboxes but automated systems with no way to track the verification email contents. I want to set this up for example: mobile - email - facebook-email - flickr-email - tumblr-email - posterous-email How do I do this without Gmail filters? I think I need to use fetchmail to watch my inbox and then autoforward to the above addresses. Is fetchmail the best solution to this issue? Any other MRA's? I'd like to do some more complicated things with the emails in an automated fashion too, how would I go about monitoring the inbox, doing some actions to the email before forwarding, and forward everywhere? prerequisites: a server: fetchmail daemon to poll the account local mailbox script to clean & forward appropriately (python probably) sendmail + ~/.forward file backup email account (Gmail probably) Any help would be greatly appreciated. I'm trying to automate my social content distribution.

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• Under FreeBSD, can a VLAN interface have a smaller MTU than the primary interface?

  - by larsks

  I have a system with two physical interfaces, combined into a LACP aggregation group. That LACP channel has two VLANs, one untagged (the "native vlan") and one using VLAN tagging. This gives us: lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4> ether 00:25:90:1d:fe:8e inet 10.243.24.23 netmask 0xffffff00 broadcast 10.243.24.255 media: Ethernet autoselect status: active laggproto lacp laggport: em1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=3<RXCSUM,TXCSUM> ether 00:25:90:1d:fe:8e inet 10.243.16.23 netmask 0xffffff80 broadcast 10.243.16.127 media: Ethernet autoselect status: active vlan: 610 parent interface: lagg0 Is it possible to set a 9K MTU on lagg0 while preserving the 1500 byte MTU on vlan0? Normally I would simply try this out, but this is actually on a vendor-supported platform and I am loathe to make changes "behind the back" of their administration interface. This system is roughly FreeBSD 7.3.

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• Conferences to go to 2011 Edition

  - by Zypher

  It's that time of year to start thinking about what conferences we want to beg,plead,borrow and steal to get to go to this year. We all like a good conference, but are generally limited in the funds available to go to them - if we are provided any - so we need to be at least a little picky. What are the conferences that you are really excited about this year, and what tracks do you think will be the most beneficial to a sysadmin?

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• Windows Server 2003 port forwarding

  - by Vitor Braga

  Using the "netsh interface portproxy" I added a port forwarding to a Windows Server 2k3. The command "netsh interface portproxy show all" shows the added forwarding. On the other hand, any client connecting to the incoming port will receive a "connection refused" message. netstat also doesn't show the incoming port as listening. The machine firewall is disabled. There is any other way to setup port forwarding on Windows or debugging tips?

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• ADSL Modem/Router sometimes hands out incorrect IP addresses

  - by Peter Keevill

  My setup is as follows:- Main ADSL modem / router (switch) configured as DHCP server with address range 192.168.0.25-60 The office machines are configured with fixed IP ( not in the same address pool of course ) and hard wired to this router. A wireless access point ( Router ) is connected to provide Internet access for guests in a separate area. This router is NOT configured as a DHCP server. Wireless authentication is turned off. IP address lease times are set to 4 hours. Sometimes guests are able to connect to the wireless access point but they are not given a valid IP. They get 169.x.x.x addresses. Rebooting their machines does not resolve the problem. The only way to resolve is to reboot the main ADSL/router which is often frustrating for other users who are successfully connected with valid IP and DG. The problem seems to occur more frequently to Apple/Mac guests although it also sometimes occurs with Win machines. I personally use Ubuntu on my Laptop and thus far, never have had any problem connecting and getting a valid IP address in the guest area. One further point of note which may give a clue is that certain guests ( always Apple/Mac ) get lease times of 90 days. However, this does not 'stack out' the number of available addresses and of course, rebooting the router clears them until the next time they login.

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• Net send question

  - by somacore

  I'm on a work laptop. If I do a 'net send' to all computers on the domain while not VPN'd into the network, and it says it's successful, one of the following is true: It failed, but thinks it's successful, and it won't send anything. It failed, but it will send next time it's on the work domain. I know I was off the domain when I sent it (I made sure of that first). What will happen?

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• How to tune TCP TIME_WAIT timeout on Solaris?

  - by Hongli Lai

  I'm trying to change the TCP TIME_WAIT timeout on Solaris. According to some Google results I need to run this command: ndd -set /dev/tcp tcp_time_wait_interval 60000 However I get: operation failed: Not owner What am I doing wrong? I'm already running ndd as root. Is there another way to tune TIME_WAIT?

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• Why would my mouse pointer be jerky when it can't get a signal from my router?

  - by izb

  I've got a fairly new PC but when moving the mouse across the screen, the pointer jerks as if the PC is freezing momentarily every second or so. Strangely, this only seems to happen if the signal from the wifi router is bad. If I move the PC closer to the router to get a full signal, it's fine. It also seems to affect the keyboard; Opening notepad and holding down a key shows the same momentary freezes. -- Update: It's a logitech wireless mouse, and a wired USB logitech keyboard.

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• Finding spoofed IP address on network

  - by Jared

  I have a few IP spoof dropped messages coming out of my Sonicwall firewall, we'll call them Source A and Source B. Both of these sources have the same mac address indicating they're coming from the layer 3 switch behind my firewall. Source A has an ip within a valid subnet on my network and it shows up in the ARP table of my layer 3 switch. I was able to trace the exact location and fix the issue. Source B's ip however, is not within valid subnet on my network and it's not showing up in my layer 3 switches arp table. Any idea how I can trace the location of this device within my network? Thanks in advance.

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• How can I detect if a NIC is UP in UNIX?

  - by Rich

  I am currently writing a bash script (for Nagios), and I would like to be able to detect if specific network cards are up or not. My best guess is to do something like this: ifconfig eth0 | grep UP | wc -l or: ethtool eth0 | grep "Link detected: yes" | wc -l Are either/both of those reliable ways of testing if the network card is up, or is there a better option? Perhaps there is a flag on ethtool which will do precisely what I want? Thanks in advance for any suggestions/pointers! Rich

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• Host a SSTP VPN Server on Windows 8

  - by Maarten

  I have a small server computer running Windows 8 at home. Currently it is hosting a PPTP VPN server using the build-in Windows 8 functionality for that. What I would want is something more secure, like an SSTP VPN server. However, I can't find any functionality of windows 8 or 3rd party software that can HOST a SSTP vpn server on Windows 8. I've only seen Client stuff and vpn pass trough services via google, all which i don't want/need. The only HOST stuff i find via google is the PPTP i set up currently. Is there any way of hosting a SSTP VPN server on my home machine? Thanks in advance, Maarten

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• impossible to connect.. days trying..

  - by dany

  I have a problem: I am on Debian. I configured my nic with a static ip (192.168.1.56). When I try to connect to a network, initially with ifconfig eth2 I get (correctly): eth2 inet addr:192.168.1.56 .... inet6 addr: fe80:221:ff:fe96:4598/64 but after a few seconds the 102.168.1.56 disappears and after some other seconds disappears the inet6 address too. When I press in the nm-applet it requires me the password but in the meantime it try to connect. At uni, the connection is a DHCP one. It works for the first few seconds but after it doesn't. Any possible solution? Here it is the relevant part of the syslog: (static ip configuration) http://pastebin.com/u3BPAsda

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• How to troubleshoot problems sharing internet connection via WiFi on Mac OS X

  - by sprugman

  I'm at a hotel, plugged into their network via ethernet on my MacBook. I want to share the connection via wifi to two other computers. I went to Prefs Sharing and set up internet sharing. I know it's working because my friend with a Mac access the net fine. My friend with the PC can see the network, but can't connect to it. In the sharing prefs, airport options, I chose these options: Channel: Automatic Enable encryption: yes WEP Key length 40-bit password length: 5 chars (as specified in the instructional text) Update: I tried it with encryption turned off, and it works. Of course, I'd rather not do that... Any ideas?

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• Loading guest OS's (Windows) localhost through my host's (Mountain Lion) browsers

  - by Jonah Goldstein

  For work, I have to develop in Visual Studio, which I run via VMware's fusion 5. I really want to test via my mac's native browsers for a multitude of reasons. that is, view the IIs web stuffs that my windows VM should expose, in my mac's own native Firefox, Chrome... etc. if i could expose a pretty url, that would be even better, but i would certainly settle for an ugly IP :) I got a decent number of views but no response when I asked in VMware's own boards. Everyone seems to want to go the other direction (developing in sublimetext/textmate serving up through MAMP and exposing it to windows browsers to test) and there seems to be tried a true solutions for this. unfortunately (or fortunately depending on your preference) my startup is pretty entrenched in the visual studio development tools. I'm really hoping that someone knows the answer to this. Thanks :)

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• Chain Gateways on the LAN

  - by Black2night

  I installed m0n0wall in a virtualized environment, i have 10 PCs connected to a router ( 192.168.1.0/24) which connect them to the internet through PPPoE, the problem is that this router does not have a QoS so what i want to do is the following :- let all the PCs get their IP from the Router and the default gateway will be m0n0wall the moon wall will have 2 interface (Lan 192.168.1.20) and (Wan 192.168.1.21 and default gateway 192.168.1.1) now when any PC want to access the internet it should go through m0n0wall and then m0n0wall will forward the connection to the default gateway through the wan interface which is the PPPoE running on the router (192.168.1.1) the big question is this scenario possible or not and what do you suggest? Thanks

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• Unable to ssh to a Linux VM after a day

  - by jogabonito

  I have a machine running 4 VMs on it. There is one Fedora VM which is causing me some trouble. The IPs of the VMs are something like 10.100.100.* I have a Windows PC which is in the same network. It has an IP 10.100.25.77. When I reboot the Fedora VM, I am able to ping it from my Windows PC as well as use putty to ssh to it. The next day, I cant ping it or ssh from my Windows PC. However I can ping and ssh to the other VMs on the machine. If I ssh to one of the other VMs, I can ping and ssh to the Fedora VM. Next if I restart it, things get back to normal and I can access it without any issues. The IP of the VM doesn't change after rebooting and it is statically assigned I would like to know what is causing this and how to get it fixed. As a last resort, I am thinking of running a cron job to restart the VM every night, it is not a critical server, but will be generally used occasionally in the day time.

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• How to find on the Windows 7 who and when use(d) a certain share?

  - by John Thomas

  We have a workstation using Win7 on a LAN with a domain. On that workstation we set up some network shares. Can we find who used (user name and/or computer name) and when the shares? Note that we know about Computer Management System Tools Shared Folders Open Files. We don't want to see so much real-time who's using the shares but we are interested more in a logging solution, ideally interpreting / using the data from Win7's Event Viewer.

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• Router loses connection to internet randomly

  - by tvanover

  I have a Belkin wireless G plus Mimo router and it randomly loses the connection to the internet. It seems to happen for a second or two, not enough to impact day to day browsing. But enough to disconnect games, or stall videos I am watching. It happens whether I am plugged into the router or connecting via wifi. I am unsure if it is my router or Comcast that is causing this issue. If I connect a computer directly to the modem the problem never occurs, so that tells me it is probably the router. But I also had a Netgear wireless router WGR614, and it had the same problem. I don't know where to start looking for the source of the problem. What logs should I be combing through? All my machines are win 7 of varying versions.

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• Ubuntu getting wrong hostname from DHCP

  - by sam

  When provisioning new Ubuntu Precise (12.04) servers, the hostname they're getting seems to be generated from the DNS search path, not a reverse lookup on the hostname. Take the following configuration BIND is configured with the hostname, and reverse name Normal zone $TTL 600 $ORIGIN srv.local.net. @ IN SOA ns0.local.net. hostmaster.local.net. ( 2014082101 10800 3600 604800 600 ) @ IN NS ns0.local.net. @ IN MX 5 mail.local.net. my-new-server IN A 10.32.2.30 And reverse @ IN SOA ns0.local.net. hostmaster.local.net. ( 2014082101 10800 3600 604800 600 ) @ IN NS ns0.local.net. $ORIGIN 32.10.in-addr.arpa. 30.2 IN PTR my-new-server.srv.local.net. Then DHCPD is configured to hand out static leases based on mac addresses like so subnet 10.32.2.0 netmask 255.255.254.0 { option subnet-mask 255.255.254.0; option routers 10.32.2.1; option domain-name-servers 10.32.2.1; option domain-name "util.of1.local.net of1.local.net srv.local.net"; site-option-space "pxelinux"; option pxelinux.magic f1:00:74:7e; if exists dhcp-parameter-request-list { option dhcp-parameter-request-list = concat(option dhcp-parameter-request-list,d0,d1,d2,d3); } group { option pxelinux.configfile "pxelinux.cfg/pxeboot"; host my-new-server { fixed-address my-new-server.srv.local.net; hardware ethernet aa:aa:aa:bb:bb:bb; } } } So the hostname should be my-new-server.srv.local.net, however when building a Ubuntu 12.04 node, the hostname ends up as my-new-server.util.of1.local.net When building Lucid (10.04) hosts, the hostname will be correct, it's only on Precise/12.04 nodes we have the problem. Doing a normal and reverse lookup on the host and IP returns the correct result Sams-MacBook-Pro:~ sam$ host my-new-server my-new-server.srv.local.net has address 10.32.2.30 Sams-MacBook-Pro:~ sam$ host my-new-server.srv.local.net my-new-server.srv.local.net has address 10.32.2.30 Sams-MacBook-Pro:~ sam$ host 10.32.2.30 30.2.32.10.in-addr.arpa domain name pointer my-new-server.srv.local.net. The contents of the hosts file is incorrect too 127.0.0.1 localhost 127.0.1.1 my-new-server.util.of1.local.net of1.local.net srv.local.net my-new-server So it looks like when it creates the hosts file, it puts the entire contents of the DNS search path into the local address so the FQDN according to the server is the short hostname as defined, then the first domain in the search path. Is there a way to get around this behaviour, or fix this so it gets the hostname correctly? It's picking up the first part of the hostname, then the rest is wrong.

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• Which program is using my network bandwidth on Mac OS X?

  - by leolobato

  Hey guys, I use iStats Menu to monitor my network usage on OSX. Is there a quick way to know which processes are using the network at any given moment? Sometimes my downstream bandwidth will be at close to 100% and I'm not downloading anything... I assume it's OSX auto-update stuff, but I just want to be sure.

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• Access points fighting for dominance?

  - by Phillip Oldham

  We have a small office with a large number of wireless devices (a mixture of desktop machines, laptops, and wifi-enabled phones) all working from a single Apple Airport Extreme which extends our wired network. I've added another Airport Extreme for resiliency, since we've been seeing a decrease in performance and (as far as I understand) access points can only handle a small number of clients. I set the new AP to extend the current network so that the clients weren't constantly switching between different wireless networks, however as soon as this AP was configured all the wireless devices started seeing network trouble, flicking on and off. I'm assuming that this is because both APs are reasonably strong, and the client can't decide which to use. What is the best route to follow to resolve this? What I'm aiming for is wireless resiliency; preferably having two APs share the network load, or if this isn't an option then having a primary AP with a "fail-over", should the primary go down for any reason.

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