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• Discover MAC address

  - by Kami

  I've to setup a bunch of server ! I need to discover their mac address with the following situation : MacBookPro >----------< Server I'm directly connected (not behind a router/switch) to the server. I've no clues about the ip address the server is using as default setup. I can't use a display connected to the server displaying its newtwork card config. How can I discover the MAC address of the server network card ? I'm looking for a command line tool. If something exists in MacPort it's also ok !

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• GNS3 Cannot ping/resolve DNS record

  - by Eldad Cohen

  I set up an internet lab with GNS3, which has 3 routers, in each node there is a computer directly connected. One of the hosts is a DNS server, Windows 2003 Server. The other one is a Windows XP machine. Ping is good between routers and machines but no ability to ping domain.com record on DNS server 2003. I set a static nat on the router to route all traffic from gateway to the DNS server internal ip address, still no answer for the dns request. Any ideas or thoughts will be most welcome.

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• European wireless data

  - by drewk

  I am on my way to Europe for 20 days with the wife and teenage kids. Among us, we have 3 iPhones, 1 Blackberry, 2 iPad 3G and 2 Macbook Pro laptops. Each has Skype. I am very concerned about AT&T data charges, and I am looking for a sensible alternative. For example, the AT&T data plans for the phones and iPads are $200 EACH for 200 MB per device. That is $1,200 and does not even cover the laptops. Ouch!!! I am thinking about a prepaid data plan from a European cell system of some sort combined with a GSM data modem and a Cradlepoint router, such as the CTR500. So, questions: 1) Anyone know of a GSM data source in Europe where I can buy a GSM Modem compatible with the CTR500 at a reasonable prepaid rate? 2) Experience with the CTR500?

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• Certain users cannot get to my server

  - by Zeno

  I am finding more and more users that report they cannot reach my server (website or services). Their tracert from that user looks like this: Tracing route to domain.com [*.*.*.255] over a maximum of 30 hops: 1 * * * Request timed out. The server is up and functional and every else reports it is fine. But there are various users who cannot get to it. I have no firewall or anything that would block anyone. Yes, the last part of the server IP is 255. Could this be causing it? http://www.dslreports.com/forum/r18539206-Last-octet-255-bug-on-Windows Or would a certain ISP be denying traffic to my server? Or something on their router level?

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• Tcpreplaying using VMware

  - by Methos

  This is more like a testbed setup question. I want to use VMware to debug some networking code in the linux kernel in the VM. My VM has two network interfaces. What I want to do is replay the capture file in the host and receive the packets in the VM. My problem is I do not see replayed packets in the VM. I am running VMware and tcpreplay on the host as sudo. Hence I think there should not be any problem access devices files. I am running VMware workstation 7.0 a. I first began with Custom networking as that provides option of creating your own virtual network name. I wrote /dev/vmnet3 and /dev/vmnet4 for the two interfaces respectively. However, after booting the guest, I did not see any of these interfaces or devices files (in /dev) created on the host. b. Then I tried 'Host Only', but that does not show what bridge/device file is associated with the interface. c. Finally I tried bridged networking mode. I see vmnet1, vmnet8 and vboxnet0 on the host. I have tcpreplayed the capture file on each of these interfaces, for all the above three cases. I tried to capture packets in the VM using "tcpdump -i any". However, I do not see any packets. Any ideas/pointers?

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• Why does WebDAV fail from inside home network

  - by Claus

  On my OSX server there is a folder that is configured in the Server App to be accessible via WebDAV. This folder is used to sync OmniFocus. On my router, I have set up a dynamic dns. When I am outside my home network (physically away or when connected via a vpn), I can connect and sync fine via: https://<server name from dyndns>/<username>/<path to WebDAV folder> However, when I am in my home network, the connection to WebDAV does not work (other connections, AFP, f.ex, do work). What could be some reasons why I can't connect to WebDAV from within my home network? What log files could give hints and where are they stored? I am running OSX server 10.9.3. and server.app. Thanks for your help.

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• Can I turn my Mac Mini into a Wi-Fi Hotspot without additional tool

  - by user262325

  Hello everyone I have an app need to test via wifi. I just wonder if there is a way to turn my Mac Mini into a Wi-Fi Hotspot without additional tool. I try to setup airport new network name is"mymacmini'. My iPod Touch also can recognize the network "mymacmini". I set my iPod wifi as "mymacmini" But if I try to connect to Internet, Safari always reports failure and connnection with Wifi. I hope to know if I need purchase a wireless router for MAc Mini or there are something wrong I did above? Thanks interdev

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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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• Reconnect feature in Jdownloader for BSNL broadband

  - by pragadheesh

  Hi, I recently downloaded JDownloader for downloading from RS. But clicking the Reconnect icon in toolbar gives the error, "Reconnect failed. Please try manual reconnect". :( In the reconnection settings, there is an entry for Router's IP. and the rest(User,pwd, Reconnection script) are blank. I having BSNL dataone broadband connection in Bangalore. I connect to internet just by turning on the modem and no user name and password is required. How can i allow Reconnection feature in JDownloader.? If a reconnection script is required how to write the script.? Badly in need of this. Thanks in advance.

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• windows 7 wireless knocks off other computers on the network

  - by Sean

  I am trying to fix a wireless network issue. When a new windows 7 machine (we have 2 in the house) we have problems with any other windows xp machines connecting to the wireless network. I am using a linksys WRT110 running Firmware Version: 1.0.04 (which is not the latest firmware its Ver.1.0.07 but the router would not use the bin update file). I have tried a ton of variations in setting for the wireless network, changed the channel, the security level (none, wep wpa, wpa2), network type (g,bg mixed). I have also read some stuff about homegroup settings for windows 7 but have not seen any differences that make a difference. Basically windows 7 does not like to connect to our network but when I manage to get it to work the windows xp pro machines get kicked off. The windows xp pro machines are a few years old but both windows 7 machines are less than 6 months old.

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• Blocking ports on the public IP assigned to lo interface in GNU/Linux

  - by nixnotwin

  I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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• dd-wrt Bonjour/ netbios etc on two subnets

  - by user72182

  Hi I was wondering if any clever people out there could help me. I have a network setup with two different subnets 192.168.1.0 and 192.168.0.0 one router is connected to a VPN (via OpenVPN) the other is not. Both routers have static routes to each other and a device on one can communicate to another without issues when using IP addresses. My problem is I want to use services like Bonjour, Netbios and Apple Talk across the two networks, which currently does not work. A laptop connected on one subnet will not see a laptop connected on another. Is there anyway that you can connect the two networks together so these sort of local service will work??? I guess I have to forward the boardcast packets but I have no idea how to do this. Thanks for any help...

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• Wake on Lan/Wan won't work after some time has passsed

  - by Vian Esterhuizen

  I have the following set up: Gigabyte Z77X-UD5H Wake On Lan Enabled Asus N66U Port Forwarding Static IP assigned to my computer Windows 7 Advanced Power Management - PCI Express - Off Intel 82579V - All options under Power Management checked I'm trying to set this up for Wake on Wan capabilities. If I shut down my computer and immediately try to Wake on Wan (and Lan) it works and starts up. While the computer is on, I've used a few WOL specific packet sniffers and the packet comes through on the correct port. After any period of time over a few minutes, waking on Wan or Lan won't work. The back "activity" light is blinking on my ethernet port on my computer, as well as on the router, so I would assume the network card is on and able to receive a signal. Any ideas? Suggestions? What can I do to troubleshoot the problem?

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• Installing and running a guest OS on KVM-qemu with only serial console access

  - by nixnotwin

  I am trying to installing a bsd distro with virt-installer. With a Linux distro I used this: virt-install -n debian -r 1024 --vcpus=1 --accelerate -v --disk /var/kvm/installation-disks/debian.img,size=6--nographics --network=bridge:br0,model=ne2k_pci,mac=52:54:00:66:68:09 -l http://ftp.de.debian.org/debian/dists/squeeze/main/installer-amd64/current/images/ -x console=ttyS0,115200 This loads the installer directly from the online mirror. With Fedora I used this mirror: http://www.nic.funet.fi/pub/mirrors/fedora.redhat.com/pub/fedora/linux/releases/16/Fedora/x86_64/os/ Are there such mirrors for freebsd or openbsd? The reason I want direct installable ftp/http mirrors is because I can access my physical server only via ssh, and it doesn't have a X server or a window manager to give me a VNC GUI. When I tried installing centos 6 with an online mirror I was able to finish the installation via serial console, but after I rebooted it, the serial console never worked for me. I tried everything possible---editing menu.lst, inttab and securtty files. Fedora 16 booted fine from serial console, but got stuck when it loaded anaconda installer. I tried editing freebsd iso installation media by adding serial console option to boot option. And installation was successful. But couldn't boot into it becuase it wasn't giving console acess. I couldn't edit any files as ufs partition cannot be loaded with write access on my Ubuntu server 10.04. Only debian squeeze worked well, it worked for me even without editing a single configuration file. I want to have CLI versions of fedora/centos and freebsd/openbsd. But, looks like there isn't any hope for me to have them, as I have to depend on a serial console to do everything.

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• Updating Cisco VPN config to add vpnc support

  - by Igor Kuzmitshov

  I have a Cisco 1841 configured for VPN connections of two types: Peer-to-peer for partners' routers (IPsec) — using different crypto isakmp key and crypto map with set peer, set transform-set, match address for every peer (same map name, different priorities). That crypto map name is added to the WAN interface. Client access (PPTP) — using vpdn-group with accept-dialin protocol pptp. Now, a new partner wants to connect using vpnc client. The latter needs IPSec ID (group name) and IPSec secret in addition to username and password. I guess that IPSec secret is pre-shared key that can be specified in crypto isakmp key on Cisco. But I could not find any VPN tutorials involving groups. Hence, my questions: How to add IPSec ID (group name) and IPSec secret on Cisco router for vpnc connections? Should I add a new crypto map matching all addresses as well? Is it possible to add this configuration without breaking the existing setup? Thank you.

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• USB 3.0 hard disk not detected on a particular host controller?

  - by Alvin Wong

  I have a USB 3.0 hard disk which has always been working on my desktop with an XHCI. Now I just bought a notebook with an XHCI (something with Intel's Ivy Bridge setup). The first time I plug the hard disk in its 3.0 port it is detected and working. A few hours later I try to connect it again, but seems that the notebook just ignored it! The light on the hard disk didn't blink as usual (instead it is hold at on). I then tested it with my desktop again and it is working perfectly. It gets trickier when I plug it in the USB 2.0 port of that notebook it is detected and working perfectly (despite the slower speed). Then I try to plug in an USB 2.0 USB flash drive to that USB 3.0 port, and it is detected (of course as USB 2.0). So, there are two USB 3.0 ports on my notebook's XHCI. Both of them are not working with my hard disk but working perfectly fine with my USB 2.0 UFD. What's wrong with it? When I plug in the hard disk, device manager doesn't change. I've tried re-installing the driver for the XHCI, but it changes nothing. Had I broke the USB 3.0-specific pins of both USB 3.0 ports?

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• Mails bounce because of invalid character ('@') in username

  - by user1598585

  I have a working exim setup with virtual users, working alright, except for when I try to send email to certain servers. These servers reject my emails because of #5.1.3 Invalid character ('@') in username. The offending header parts seem to be: Return-path: <"[email protected]"@smtp.example.com> and ...(envelope-from <"[email protected]"@smtp.example.com>)... The problem is that I cannot find where and why the usernames are being generated like this. My router for submission is: dnslookup: driver = dnslookup domains = ! +local_domains transport = remote_smtp ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 no_more And the respective transport: remote_smtp: driver = smtp What can be producing this problem?

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• Not working WEP key in Ubuntu

  - by stupid-idiot

  This time I've got some problem with connection to the internet from my old laptop with ubuntu, I already had some problems with setting up the radio on my network card but I think it works now since it finds some wireless networks. The problem is that I can't connect to my router via wi-fi even if I'm hundred-percently sure the wepkey I punch there is correct, it works via LAN though. Also, I'm not able to ping myself with 127.0.0.1. I'm sorry to say it but I don't think I can stand this shitness for much longer. Although it's much much faster than Windows it's useless since i can't download any libraries for development. If anyone has any experience with this, even indirect, please leave your answer or comment thx

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• Recover from running "route -f"

  - by James L.

  I was trying to capture localhost traffic with Ethereal, which doesn't work without re-routing localhost traffic to your router gateway. I didn't get the route command quite right, and messed up my routing table. I typed route -f to clear the routing table and rebooted, but when I finished rebooting, the routing table wasn't restored to its original state. I didn't use the -p parameter, so none of my changes should have persisted after a reboot. What can I do to restore the routing table to its default routes?

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• Windows File Sharing - Long Initial Delay

  - by Isaac Sutherland

  I have two Windows 7 machines connected to a router. I created a shared folder on machine A, and I can access it from machine B. The transfer speed is great. However, there is sometimes a long initial delay when I try to access the shared folder from machine B. I'll click to open the folder, and windows explorer pauses for a few minutes before actually loading the contents of the folder. After it loads, however, I can navigate the subfolders and edit files with no noticeable delay. Then, some time later, I will get the huge delay on saving a file, after which subsequent saves have no delay. What is the problem here, and how can I fix it?

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• routing wiredness - traceroute 'vanishes' en route

  - by The Journeyman geek

  I'm attempting to set up one of my boxes as a server (again), but i'm having some odd connection issues- the box itself connects fine to the internet, but trying to connect to my external ip address seems to result in the trace getting 'lost' partway. http://pastebin.com/HCQAGbvn - this is a traceroute from another system that's connected to another ISP - starhub is my own one, while i have another system that i have access to on singtel. I'm wondering if my ISP is messing around with routing, or is something very odd going on. As you note, the traceroute dosen't reach me, but if it helps, i use a dd-wrt router.

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• help setting up an IPSEC vpn from my linux box

  - by robthewolf

  I have an office with a router and a remote server (Linux - Ubuntu 10.10). Both locations need to connect to a data supplier through a VPN. The VPN is an IPSEC gateway. I was able to configure my Linksys rv42 router to create a VPN connection successfully and now I need to do the same for Linux server. I have been messing around with this for too long. First I tried OpenVPN, but that is SSL and not IPSEC. Then I tried Shrew. I think I have the settings correct but I haven't been able to create the connection. It maybe that I have to use something else like a direct IPSEC config or something like that. If someone knows of a way to turn the following settings that I have been given below into a working IPSEC VPN connection I would be very grateful. Here are the settings I was given that must be used to connect to my supplier: Local destination network: 192.168.4.0/24 Local destination hosts: 192.168.4.100 Remote destination network: 192.167.40.0/24 Remote destination hosts: 192.168.40.27 VPN peering point: xxx.xxx.xxx.xxx Then they have given me the following details: IPSEC/ISAKMP Phase 1 Parameters: Authentication method: pre shared secret Diffie Hellman group: group 2 Encryption Algorithm: 3DES Lifetime in seconds:28800 Phase 2 parameters: IPSEC security: ESP Encryption algortims: 3DES Authentication algorithms: MD5 lifetime in seconds: 28800 pfs: disabled Here are the settings from my attempt to use shrew: n:version:2 n:network-ike-port:500 n:network-mtu-size:1380 n:client-addr-auto:0 n:network-frag-size:540 n:network-dpd-enable:1 n:network-notify-enable:1 n:client-banner-enable:1 n:client-dns-used:1 b:auth-mutual-psk:YjJzN2QzdDhyN2EyZDNpNG42ZzQ= n:phase1-dhgroup:2 n:phase1-keylen:0 n:phase1-life-secs:28800 n:phase1-life-kbytes:0 n:vendor-chkpt-enable:0 n:phase2-keylen:0 n:phase2-pfsgroup:-1 n:phase2-life-secs:28800 n:phase2-life-kbytes:0 n:policy-nailed:0 n:policy-list-auto:1 n:client-dns-auto:1 n:network-natt-port:4500 n:network-natt-rate:15 s:client-dns-addr:0.0.0.0 s:client-dns-suffix: s:network-host:xxx.xxx.xxx.xxx s:client-auto-mode:pull s:client-iface:virtual s:client-ip-addr:192.168.4.0 s:client-ip-mask:255.255.255.0 s:network-natt-mode:enable s:network-frag-mode:disable s:auth-method:mutual-psk s:ident-client-type:address s:ident-client-data:192.168.4.0 s:ident-server-type:address s:ident-server-data:192.168.40.0 s:phase1-exchange:aggressive s:phase1-cipher:3des s:phase1-hash:md5 s:phase2-transform:3des s:phase2-hmac:md5 s:ipcomp-transform:disabled Finally here is the debug output from the shrew log: 10/12/22 17:22:18 ii : ipc client process thread begin ... 10/12/22 17:22:18 < A : peer config add message 10/12/22 17:22:18 DB : peer added ( obj count = 1 ) 10/12/22 17:22:18 ii : local address 217.xxx.xxx.xxx selected for peer 10/12/22 17:22:18 DB : tunnel added ( obj count = 1 ) 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : proposal config message 10/12/22 17:22:18 < A : client config message 10/12/22 17:22:18 < A : local id '192.168.4.0' message 10/12/22 17:22:18 < A : remote id '192.168.40.0' message 10/12/22 17:22:18 < A : preshared key message 10/12/22 17:22:18 < A : peer tunnel enable message 10/12/22 17:22:18 DB : new phase1 ( ISAKMP initiator ) 10/12/22 17:22:18 DB : exchange type is aggressive 10/12/22 17:22:18 DB : 217.xxx.xxx.xxx:500 <- 206.xxx.xxx.xxx:500 10/12/22 17:22:18 DB : c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 DB : phase1 added ( obj count = 1 ) 10/12/22 17:22:18 : security association payload 10/12/22 17:22:18 : - proposal #1 payload 10/12/22 17:22:18 : -- transform #1 payload 10/12/22 17:22:18 : key exchange payload 10/12/22 17:22:18 : nonce payload 10/12/22 17:22:18 : identification payload 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v00 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v01 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v02 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( draft v03 ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports nat-t ( rfc ) 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local supports DPDv1 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SHREW SOFT compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is NETSCREEN compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is SIDEWINDER compatible 10/12/22 17:22:18 : vendor id payload 10/12/22 17:22:18 ii : local is CISCO UNITY compatible 10/12/22 17:22:18 = : cookies c1a8b31ac860995d:0000000000000000 10/12/22 17:22:18 = : message 00000000 10/12/22 17:22:18 - : send IKE packet 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 ( 484 bytes ) 10/12/22 17:22:18 DB : phase1 resend event scheduled ( ref count = 2 ) 10/12/22 17:22:18 ii : opened tap device tap0 10/12/22 17:22:28 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:38 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:48 - : resend 1 phase1 packet(s) 217.xxx.xxx.xxx:500 - 206.xxx.xxx.xxx:500 10/12/22 17:22:58 ii : resend limit exceeded for phase1 exchange 10/12/22 17:22:58 ii : phase1 removal before expire time 10/12/22 17:22:58 DB : phase1 deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : closed tap device tap0 10/12/22 17:22:58 DB : tunnel stats event canceled ( ref count = 1 ) 10/12/22 17:22:58 DB : removing tunnel config references 10/12/22 17:22:58 DB : removing tunnel phase2 references 10/12/22 17:22:58 DB : removing tunnel phase1 references 10/12/22 17:22:58 DB : tunnel deleted ( obj count = 0 ) 10/12/22 17:22:58 DB : removing all peer tunnel refrences 10/12/22 17:22:58 DB : peer deleted ( obj count = 0 ) 10/12/22 17:22:58 ii : ipc client process thread exit ...

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• What is the best way to setup a public and private wireless access point on the same home network?

  - by Dougman

  For my home network (with internet provided from a cable modem) I would like to setup a secure wireless access point that I use for all of my personal connections (home PC, iPhone, Xbox, etc) and also another public access point that friends and folks in the neighborhood may connect to (for good karma). I want to ensure that my private traffic cannot be accessed from users of the public access point. I currently have one router that is running the Tomato firmware that I use with WPA security. What is the best way to accomplish this kind of setup securely (if it is possible in a home environment)?

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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers? What we ended up doing In case anyone are courious, we ended up doing seperate VLANs for each user. And as a matter of fact, not just the 550 users, but for 2500 users (11 dorms). Here's a page describing the setup: http://k-net.dk/technicalsetup/ (the section "Transparent firewall using VLANs"). There was no significant load on the router server as I feared in one of the comments below. Even at 800Mpbs.

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• Create 301 Redirection in Amazon Route 53 for Wildcard Subdomains

  - by Eric Yin

  My domain name hosted on Route 53 DNS. Amazon has a guide to do 301 redirection for www. To naked domain by point www. version to a S3 static website with 301 setted up. My question is, how can I have *.domain.com all have 301 redirec to naked domain name. I guess either: Some way to get all wildcard subdomains end up into one S3 bucket, how? Or: Use CloudFront on the www. version S3 site and put wildcard subdomains on the CloudFront, but how? Or: There's some hidden settings just lies on Router 53, then where? Or: use EC2, better not suggest me this, too costing for this task. Please advice.

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