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• Changing externally visible IP on a multi-IP router?

  - by AlternateZ

  I work at a public library and I'm trying to configure OCLC's EzProxy software. I've run into a problem and I think it's related to our network config. I'm punching above my weight here a little so I need some help. I think I'm trying to configure a 1:1 NAT, but not sure how or if our hardware supports it. The EzProxy machine is on an internet line which supports multiple external IPs. Our router is a Billion BiGuard30. There's another server on this line, let's say its IP is x.x.x.9. The EzProxy machine is x.x.x.11 I've set up port forwarding from x.x.x.11 on the http ports to the EzProxy machine. Trying to browse to x.x.x.11 from an external PC works fine - we get to the EzProxy page we are serving. However, if we go to something like WhatIsMyIP from the EzProxy machine, it says that its IP is x.x.x.9. This causes problems with our user authentication software. How do we make the rest of the internet see that the machine is x.x.x.11? There doesnt seem to be any "outbound port forwarding" on the Billion router, nor is there any "1:1 NAT" options in its config webpage. The EzProxy machine is running Ubuntu 12.04, if that helps.

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• How to use nsupdate to create NAPTR record

  - by Jon Skarpeteig

  What's a working example for creating a NAPTR record using nsupdate against Bind9? man nsupdate sais: update add {domain-name} {ttl} [class] {type} {data...} Adds a new resource record with the specified ttl, class and data. But I can't seem to find the correct format for NAPTR My attempt: echo -e 'update add enum.example.com 60 IN NAPTR 1.1.1.1.1."u"."E2U+sip"."!^.*[email protected]!" .'"\nsend"|nsupdate results in: invalid rdata format: not a valid number syntax error

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• Force netsh/arp binding multicast IP addres with specific MAC address

  - by Olivier

  I would like to setup an binding from an IP address to a MAC address using netsh. Goal is to bond an IP address which is a multicast address (224.224.x.y) to a given MAC address (which is NOT the calculated one from the multicast IP address : 01:00:5e:X:Y:Z It used to work with Windows XP (was it a bug that used to be "perfect" for my needs?), but Windows 7/8/8.1 forces the MAC address to the calculated one instead of letting me put what I want! (http://nettools.aqwnet.com/ipmaccalc/ipmaccalc.php shows MAC address calculation for multicast IP address) Thus I'm doing the following. Listing existing mappings: netsh.exe interface ip show neighbors "Ethernet" Interface 12 : Ethernet Internet address Physical address Type 224.0.0.22 01-00-5e-XX-YY-ZZ static Then adding my interface mapping manually: netsh.exe interface ip add neighbors "Ethernet" "224.xxx.yyy.zzz" "00-80-EE-UU-VV-WW" Finally, listing again my mappings: netsh.exe interface ip show neighbors "Ethernet" Interface 12 : Ethernet Internet address Physical address Type 224.0.0.22 01-00-5e-XX-YY-ZZ static **224.xxx.yyy.zzz 01-00-5e-UU-VV-WW static** As you can see, the MAC Address of the second entry (the one I just made) has been dynamically replaced by the calculated MAC Address corresponding to my IP Address... Calculation is done as follow (and displayed in hexa): UU=(xxx-128) VV=yyy WW=zzz But I don't want that behavior. My IP address and MAC address cannot be changed, and I must associate them accurately. Does anybody know how to disable MAC address substitution/calculation in netsh? Thanks, Olivier.

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• How do I view the job queue in lftp after it has moved to a background process?

  - by drpfenderson

  I've just started using lftp for remote transferring files on my Raspberry Pi running Debian. I know how to transfer the files, and use queue and jobs to add and view transferring files. However, I'm not actually sure on how to view these transfers once lftp moves to the background. The lftp man page mentions how lftp is moving to the background, but when I open a new instance of the program from shell and type jobs, the queue is empty. However, I can clearly see using my file manager that the transfers are still happening, as the files are there and growing in size. I'm guessing that when I reopen lftp, it's just opening a new instance that isn't connected to the nohup mode lftp that has the active queue. I've tried searching various places, but no one else seems to have this particular issue. So, I guess what I'm asking is twofold: Is there a way to easily attach to the background lftp process to view the current jobs list? If not, is there a way to view this at all?

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• Server and Network Lag

  - by DanSpd

  At my home I have a server and my computer. Server has Windows Server 2008 Standart 64 bit installed and then my computer has Windows 7 64 bit installed. My home router is DIR-615 My server has a game server installed on it and basically total open connections on server are around 700. Once its around 700 server and then whole home network lags really badly. My internet connection is good and only around 600kb/s is being used out of 2mb/s (real download/upload speeds). So far I assume that my router has a connection limit and with server + my computer connections it peaks at around 1k and lags everything. Another assumption server lag comes from connection limit. On the internet I have read that standart version of server has connection limit of 700 + 10 reserved. I do not rmember where I found that information but it was on microsoft website. So I have two options. First is to upgrade my router to Netgear FVS318G-100 and second is to change connections limit on server. Any advices? Thank you

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• Server and Network Lag

  - by DanSpd

  At my home I have a server and my computer. Server has Windows Server 2008 Standart 64 bit installed and then my computer has Windows 7 64 bit installed. My home router is DIR-615 My server has a game server installed on it and basically total open connections on server are around 700. Once its around 700 server and then whole home network lags really badly. My internet connection is good and only around 600kb/s is being used out of 2mb/s (real download/upload speeds). So far I assume that my router has a connection limit and with server + my computer connections it peaks at around 1k and lags everything. Another assumption server lag comes from connection limit. On the internet I have read that standart version of server has connection limit of 700 + 10 reserved. I do not rmember where I found that information but it was on microsoft website. So I have two options. First is to upgrade my router to Netgear FVS318G-100 and second is to change connections limit on server. Any advices? Thank you

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• Server and Network Lag

  - by DanSpd

  At my home I have a server and my computer. Server has Windows Server 2008 Standart 64 bit installed and then my computer has Windows 7 64 bit installed. My home router is DIR-615 My server has a game server installed on it and basically total open connections on server are around 700. Once its around 700 server and then whole home network lags really badly. My internet connection is good and only around 600kb/s is being used out of 2mb/s (real download/upload speeds). So far I assume that my router has a connection limit and with server + my computer connections it peaks at around 1k and lags everything. Another assumption server lag comes from connection limit. On the internet I have read that standart version of server has connection limit of 700 + 10 reserved. I do not rmember where I found that information but it was on microsoft website. So I have two options. First is to upgrade my router to Netgear FVS318G-100 and second is to change connections limit on server. Any advices? Thank you

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• "setpci: command not found" in CentOS

  - by spoon16

  I'm trying to configure my Mac Mini running CentOS 5.5 to start automatically when power is restored after a power loss. I understand the following command has to be executed: setpci -s 0:1f.0 0xa4.b=0 When I run that command on my machine though I get bash: setpci: command not found. Is there a package I need to install via yum or something? I'm not seeing a clear answer via Google and I looked at the man page for setpci and it doesn't mention anything. Also, does this command need to be run every time the machine starts or just once?

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• How to run Android-x86 project's ISO in VirtualBox with ethernet?

  - by Shiki

  I managed to find a way just days ago, but I had to leave my other PC and now I have no clue how to get it working again. Basically you have to get the image, then install it in a VirtualBox guest. Now the problem is ... when you launch your VM, there is no internet connection. No with NAT or Bridged. Tried all the network cards too. Since internet connection is crucial for Android development, I have to get this thing working. (As I said, I managed to fix it once.) I'm using: - The 4.0 RC1 images from Android-x86 - VirtualBox - Eclipse 4.2 Juno with the latest Android ADT - Android SDK v18 - upgraded to 19 via the Package manager. Now I seen a lot of different builds on the net, about different Android builds for VirtualBox. I have checked Buildroid for example, but there is no network connection. I have imported the virtual machine just as the howto said. The extension package is also installed and it's up to date.

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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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• Inter-vlan routing issues

  - by DKNUCKLES

  I've been brought in to help administer a network and I've run into an issue - I'm not sure why this one is beyond me, however I figure an extra set of eyes on the problem may help resolve the issue. I have an HP MSM720 controller and at the time I'm trying to set up a basic hotspot set up with access points. For the time being I'm just looking to have people authenticate with a PSK and access the internet and other resources (namely printers) on other vlans. The user authenticates and the DHCP server on the controller gives them a 192.168.1.0/24 address. They are able to successfully browse the internet and ping machines on other networks, however they are unable to print to network printers that sit on the same LANs as the very computers that wireless clients can ping. The (extremely simplified) topology is as follows Computers on the wireless 192.168.1.1 network are able to ping computers on the 192.168.0.0 network, however cannot ping or print to the printers on the same network. I'm baffled and I have no idea why this is the case. Can anyone shed some light on this for me? Can someone spot the error of my configuration? EDIT : It should be noted that for whatever reason other computers on the 10.0.100.0/24 network cannot even ping the gateway of the Wireless Access network (192.168.1.1) - I'm not sure if this is relevant. These are the VLANS listed on the controller.

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• Vmware Player 3.0 - cannot ping 32 bits guest from 64 bits (guest or host)

  - by npmj

  I'm stuck with what seems a bug in VmWare Player (build 203739). I'm using W7 Ultimate 64bits as host and have a CentOS 5.4 (64 bits) as a guest and a Windows XP Professional SP3 (32 bits) as another guest. From the 64 bits machines (the host and the linux guest) I cannot ping the windows XP. Off course, I already turned off the windows firewall in the guest and also in the host. The network is pretty basic, I'm using Vmnet8 (NAT), with DHCP and port forwarding (to the windows XP's IP). Everything is working ok, I have internet access from host and from both guests. Port forwarding to the XP guest is working ok too. The only problem is that I cannot access the XP guest through the Vmnet8. I monitored the traffic using wireshark (in the host and in the windows guest). If I try to ping the XP guest from the host, what I see is the ARP request leaving the host, being answered by the guest and, after that, there is no echo request leaving the host. The same occurs if I try to ping the XP from the CentOs guest. From the windows XP guest I can ping both the host and the CentOs guest. From the XP guest I can access the host shares. Obviously, from the host I cannot see the XP shares (as I cannot even ping the guest). I want to maintain this setup (using NAT to share the host's internet connection). Any suggestions?

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• How to avoid intrusion detection/anti spoofing issue on a sonicwall TZ series FW

  - by Ian

  We have a sonicwall tz series FW with two internet service providers connected. One of the providers has a wireless service which works a bit like an ethernet switch in that we have an ip with a /24 subnet and the gateway is .1. All other clients on the same subnet (say 195.222.99.0) have the same .1 gateway - this is important, read on. Some of our clients are also on the same subnet. Our config: X0 : Lan X1 : 89.90.91.92 X2 : 195.222.99.252/24 (GW 195.222.99.1) X1 and X2 are not connected, other than both being connected to the public Internet. Client config: X1 : 195.222.99.123/24 (GW 195.222.99.1) What fails, what works: Traffic 195.222.99.123 (client) <- 89.90.91.92 (X1) : Spoof alert Traffic 195.222.99.123 (client) <- 195.222.99.252 (X1) : OK - no spoof alert I have several clients with IPs in the 195.222.99.0 range and all provoke identical alerts. This is the alert I see on the FW: Alert Intrusion Prevention IP spoof dropped 195.222.99.252, 21475, X1 89.90.91.92, 80, X1 MAC address: 00:12:ef:41:75:88 Anti-spoofing is switched off on my FW (network-mac-ip-anti-spoofing - config for each interface) for all ports I can provoke the alerts by telneting to a port on X1 from the clients. You can't argue with the logic - this is suspicious traffic. X1 is receiving traffic with a source IP which corresponds to X2s subnet. Anyone know how can I tell the FW that packets with a src subnet of 195.222.99.0 can legitimately appear on X1? I know whats going wrong, I've seen the same thing before, but with higher end FWs you can avoid this with a few extra rules. I can't see how to do this here. And before you ask why we're using this service provider - they give us 3ms (yep 3ms, thats not an error) delay between routers.

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• Vmware Player 3.0 - cannot ping 32 bits guest from 64 bits (guest or host)

  - by npmj

  I'm stuck with what seems a bug in VmWare Player (build 203739). I'm using W7 Ultimate 64bits as host and have a CentOS 5.4 (64 bits) as a guest and a Windows XP Professional SP3 (32 bits) as another guest. From the 64 bits machines (the host and the linux guest) I cannot ping the windows XP. Off course, I already turned off the windows firewall in the guest and also in the host. The network is pretty basic, I'm using Vmnet8 (NAT), with DHCP and port forwarding (to the windows XP's IP). Everything is working ok, I have internet access from host and from both guests. Port forwarding to the XP guest is working ok too. The only problem is that I cannot access the XP guest through the Vmnet8. I monitored the traffic using wireshark (in the host and in the windows guest). If I try to ping the XP guest from the host, what I see is the ARP request leaving the host, being answered by the guest and, after that, there is no echo request leaving the host. The same occurs if I try to ping the XP from the CentOs guest. From the windows XP guest I can ping both the host and the CentOs guest. From the XP guest I can access the host shares. Obviously, from the host I cannot see the XP shares (as I cannot even ping the guest). I want to maintain this setup (using NAT to share the host's internet connection). Any suggestions?

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• Torque and maui node status

  - by Lafada

  I am new for torque and maui. I was checking for node state to looking for which nodes are free and which nodes are in use. For torque one command is pbsnodes. Which gives status and other info related to node. When I was checking for maui then I found command diagnose -n which also shows status of the node. I was wondering between these 2 status. Both are giving different status for the same situation. When I do man pbsnodes I got the possible states for node "free", "offline", "down", "reserve", "job-exclusive", "job-sharing", "busy", "time-shared", or "state-unknown" But this type of different state I cant find for diagnose -n. How pbsnodes and diagnose -n get the status for node. Is there any database like xCAT use for torque or maui? Thx in advance for your valuable time.

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

  - by Tester101

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

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• Ping: sendmsg: operation not permitted error after installing iptables on Arch GNU/Linux

  - by estol

  Yesterday I got a new computer as my homeserver, a HP Proliant Microserver. Installed Arch Linux on it, with kernel version 3.2.12. After installing iptables (1.4.12.2 - the current version afaik) and changing the net.ipv4.ip_forward key to 1, and enabling forwarding in the iptables configuration file (and rebooting), the system cannot use any of its network itnerfaces. Ping fails with Ping: sendmsg: operation not permitted If I remove iptables completely, networking is okay, but I need to share the Internet connection to the local network. eth0 - wan NIC integrated on the motherboard (no idea of vendor, probably HP). eth1 - lan NIC in a pci-express slot (Intel Gigabit CT Desktop http://www.intel.com/content/www/us/en/network-adapters/gigabit-network-adapters/gigabit-ct-desktop-adapter.html) Since it works without iptables(server can access the internet, and I can login with ssh from the internal network), I assume it has something to do with iptables. I do not have much experience with iptables, so I used these as reference (separate from each other of course...): wiki.archlinux.org/index.php/Simple_stateful_firewall#Setting_up_a_NAT_gateway revsys.com/writings/quicktips/nat.html howtoforge.com/nat_iptables On my previous server, I used the revsys guide to set up nat, worked like a charm. Anyone experienced anything like this before? What am I doing wrong? Thanks, estol

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• If I'm a web server, for which accounts can I turn off shells within passwd file?

  - by eric01

  I am making a web server running LAMP and want to access it using SSH. When I open the passwd file, I see all those accounts and I want to know for which ones I can put false. I have the following accounts: root, daemon, bin, sys, sync, games, man, lp, mail, news, uucp, proxy, www-data backup, list, irc, gnats, nobody, libuuid, syslog, messagebus, whoopsie, mandscape, sshd, eric Except root, sshd and eric, which ones should I not disable? How about www-data and sshd? Thanks a lot for your help.

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• VSFTPD and Implicit SSL

  - by Luma

  Hi Everyone, I have a Debian Dedicated server and I want to enable Implicit SSL on it using VSFTPD and I am having a hard time. I have read online and the only thing I can really find is how to enable SSL and in the man pages it lists one implicit ssl command. but since Implicit ssl uses a second listener (990 by default) I have no idea how to make it work on Debian. Has anyone managed to get this working? Here is my config: listen=YES anonymous_enable=NO local_enable=YES write_enable=YES local_umask=022 connect_from_port_20=YES pam_service_name=vsftpd ssl_enable=YES allow_anon_ssl=NO force_local_data_ssl=NO force_local_logins_ssl=NO ssl_tlsv1=YES ssl_sslv2=NO ssl_sslv3=NO rsa_cert_file=/etc/ssl/certs/vsftpd.pem if I include Implicit_SSL=YES the server won't even start. thanks

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• Limiting bandwidth on internal interface on Linux gateway

  - by Jack Scott

  I am responsible for a Linux-based (it runs Debian) branch office router that takes a single high-speed Internet connection (eth2) and turns it into about 20 internal networks, each with a seperate subnet (192.168.1.0/24 to 192.168.20.0/24) and a seperate VLAN (eth0.101 to eth0.120). I am trying to restrict bandwidth on one of the internal subnets that is consistently chewing up more bandwidth than it should. What is the best way to do this? My first try at this was with wondershaper, which I heard about on SuperUser here. Unfortunately, this is useful for exactly the opposite situation that I have... it's useful on the client side, not on the Internet side. My second attempt was using the script found at http://www.topwebhosts.org/tools/traffic-control.php, which I modified so the active part is: tc qdisc add dev eth0.113 root handle 13: htb default 100 tc class add dev eth0.113 parent 13: classid 13:1 htb rate 3mbps tc class add dev eth0.113 parent 13: classid 13:2 htb rate 3mbps tc filter add dev eth0.113 protocol ip parent 13:0 prio 1 u32 match ip dst 192.168.13.0/24 flowid 13:1 tc filter add dev eth0.113 protocol ip parent 13:0 prio 1 u32 match ip src 192.168.13.0/24 flowid 13:2 What I want this to do is restrict the bandwidth on VLAN 113 (subnet 192.168.13.0/24) to 3mbit up and 3mbit down. Unfortunately, it seems to have no effect at all! I'm very inexperienced with the tc command, so any help getting this working would be appreciated.

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• signed software :: installer -- system software and package installer tool (Apple *.pkg)

  - by fyodor78

  Does anybody know a few details about signed software and /Applications/Utilities/Installer.app? I didn't find more at Wikipedia (https://secure.wikimedia.org/wikipedia/en/wiki/Installer_%28Mac_OS_X%29) and the UNIX-Manual (man 8 installer). I have here a valid signature from iLife 11 Installer.app (http://i.imgur.com/Y3raY.jpg). Does this mean I can be 100% sure that nothing is modified? It means I can trust this PKG because signed by Apple? Or did I get something wrong?

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• File sync over LAN

  - by Jack

  At the moment, I'm using Dropbox on my computer and Dropsync on my Android phone (over WiFi) to one-way sync the files (such as photos/app backups) on my phone to the Dropbox servers which are then synced to my computer. I like the features of Dropsync which can be set to sync only when the phone is charging and the WiFi is on. So everytime I charge my phone, i know my files are being backed up. Now I'm wondering if there's a similar app/program combo or something that can do what I'm currently doing but remove the middle-man (Dropbox servers)?

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• SSD - Tweaks/Recommended Configuration

  - by Miky D

  I've just purchased my first SSD drive (a 32GB MLC from Imation) without doing enough research ahead of time in the spirit of giving the new technology a shot and getting myself up to speed by empirical research rather than reading countless reviews and I'm now at a crossroads. I've built a new server to test the new drive and at first I wanted to test it with Windows Server 2003 R2 x86 but after I loaded the OS on it and it had problems loading the drivers of the motherboard I went to the internet and did more research and the more I read the more I got confused. Finally I decided to try out Windows Server 2008 R2 x64 since it supposedly has certain support for SSD drives inherent in the NT 6.1 core. Indeed I've had much better luck with the new OS and got all the drivers installed but now I still have some questions: Should I set the drive to: IDE Emulation or AHCI in the BIOS? Should I make any other changes in the BIOS (I've read on the internet that Write Through should be changed to Write Back) Should I make any other adjustments in Windows (i.e. Tweaks such as disabling prefetching or disabling the Last Accessed Timestamp on the filesystem) and if so, is there a good/reliable online resource with instructions? I'm so tired of reading through countless online posts which spend 80% of coverage on the history of SSDs and benchmarks and explanations of how SSDs work. I got that, now I'd like to know if there's anything I should actually do to make sure Windows Server 2008 R2 makes good use of the SSD.

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• How do you enable syslogd to accept incoming connections on Snow Leopard from remote loggers?

  - by Emmel

  How do I get syslogd to accept incoming connections from remote hosts on Snow Leopard? I'd like to centralize logging such that various devices and systems send logs to Snow Leopard's syslogd, which normally hangs out on UDP 514. However, I'm unable to get them to successfully be accepted by good ole syslogd. I tcpdumped on the Snow Leopard box to verify that packets are being spouted to port 514 -- they are. I checked that syslogd is listening on 514 -- it's not. Googling around told me that, on older versions of OSX (don't you love the way things change so rapidly on OSX), one just had to add a flag to the syslogd daemon to allow remote; one did this in com.apple.syslogd.plist. However the syslogd daemon has no flags (at least in its man page) that suggests any remote anything. What's the solution to this? Secondary, less import but relevant question: What's 'newsyslog'? I see a plist file but it's not running (apparently). Thanks

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• Can I attach a VPN firewall to an existing network and have it manage VPN connections?

  - by jules

  I'm quite new to networking and am trying to set up my first VPN connection. The Situation: I have been contracted for some programming at a facility some distance from my location. I would like to be able to set up a simple VPN connection to their network so that I may make adjustments without significant travel. Their Current Network: Six devices (one I need to connect to) plugged into a basic router (Dlink). This router has an internet connection and a static ip address. My Hopeful (questionable) Proposal: I attach a VPN Firewall I happen to own (Netgear FVS318) as device number seven on the client network. I disable routing / DHCP in the Netgear. I forward the appropriate IPSec ports from the Dlink to the Netgear. I then create a VPN connection on my office Windows 7 machine to the remote network. The request is forwarded from the Dlink to the Netgear where the VPN connection is authenticated. I now have a remote-access connection from my office PC to the client's local network. The Question: Will this proposal work? If not, would another possibility be to attach a computer with a VPN server to the client network? Also, as a note: the client has requested I not replace their router or place mine in-between theirs and the internet :( Thanks very much!

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