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• Can I replace a router and DHCP server without disrupting traffic?

  - by SRobertJames

  I have a device which acts as a router and DHCP server. I'm replacing it, and would like to minimize down time. If I unplug it, and plug in a different device with the same IP, will all the PCs with DHCP leases keep on working? (I have DHCP Conflict detect on, so it shouldn't reassign a DHCP address already used). What if I want to change the IP (new subnet) - is there anyway to tell all the clients (Windows PCs) to release their DHCP leases and request new ones in a minute? If before unplugging the old device, I have it release all DHCP leases, will the Windows PCs automatically ask for new DHCP addresses?

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• Configuring Linux Network

  - by Reiler

  Hi I'm working on some software, that runs on a Centos 5.xx installation. I'ts not allowed for our customers to log in to Linux, everything is done from Windows applications, developed by us. So we have build a frontend for the user to configure network setup: Static/DHCP, ip-address, gateway, DNS, Hostname. Right now I let the user enter the information in the Windows app, and then write it on the Linux server like this: Write to /etc/resolv.conf: Nameserver Write to /etc/sysconfig/network: Gateway and Hostname Write to /etc/sysconfig/network-scripts/ifcfg-eth0: Ipaddress, Netmask, Bootproto(DHCP or Static) I also (after some time) found out that I was unable to send mail, unless I wrote in /etc/hosts: 127.0.0.1 Hostname All this seems to work, but is there a better/easier way to do this? Also, I read the network configuration nearly the same way, but if I use DHCP, I miss som information, for instance the Ip-address. I know that I can get some information from the commandline (ifconfig), but I dont get for instance Hostname, Gateway and DNS. Is there a commandline tool that will display this?

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• Windows VPN - NO internet access

  - by sharru

  I host a network of servers behind a Fortigate 200a firewall in the DC. I connect to those servers via a VPN connection. The problem is that when i connect to the VPN, I lose my internet connection on the local PC (windows 7). I would like to be connected to the VPN and still surf the web. i guess this means to only forward a range of ip to the VPN connection. I've read other answers on serverfault, talking about "un-check the 'Use default gateway on remote network' option in your Windows 7 PPTP network connection settings". When i do that , i get internet access but no access to the servers in the VPN. Any idea how to get both working? Should i change something on the fortigate 200a config? Do i need two networks cards? Is there a place in windows to define ip range for the vpn connection?

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• Trouble opening my router to my web server

  - by Justin Heather Barrios

  Here's the story. I have a webs server created and connected to my router. The website works great when I'm connected to the router, but when I'm off the network I can't access the website. I got the IP for my router by googling "what is my ip." I have opened ports 80 to 10080 to link to the server in the router. One odd thing that I don't understand. When I am in network if I access XXX.XXX.XX.XX:80 I can access the web page no problem. If I access XXX.XXX.XX.XX:81 (or any other port) I get the error "Cannot access server." Any idea what the problem could be? Could it be my ISP?

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• Iptables REDIRECT + openvpn problem

  - by Emilio

  I want to redirect connection to port 22 to my openvpn binded port, on 60001. Openvpn is running on server on 60001 server:~$ sudo netstat -apn | grep openvpn udp 0 0 67.xx.xx.137:60001 0.0.0.0:* 4301/openvpn I redirect on server port 22 to 60001 server:~$ sudo iptables -F -t nat server:~$ sudo iptables -A PREROUTING -t nat -p udp --dport 22 -j REDIRECT --to-ports 60001 I start openvpn client (openvpn.conf is correct, it works with remote IP 22 replaced with remote IP 60001) client:~$ ./openvpn openvpn.conf Tue Apr 27 00:42:50 2010 OpenVPN 2.1.1 i686-pc-linux-gnu [SSL] [EPOLL] built on Mar 23 2010 Tue Apr 27 00:42:50 2010 UDPv4 link local (bound): [undef]:1194 Tue Apr 27 00:42:50 2010 UDPv4 link remote: 67.xx.xx.137:22 Tue Apr 27 00:42:52 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) Tue Apr 27 00:42:55 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) ... It doesn't connect. iptables shows requests from client to server but no answers. What's wrong with it?

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• Web Development - How to access custom host, defined in my hosts file, from another device in the same network

  - by Neara

  Ok, I hope i'll be able to explain the issue im experiencing. I'm working on a project, that has 2 parts: one takes all requests from usual localhost, the other handles requests from myhost.local. While trying to access both addresses from my computer, it works ok. But now i need to test myhost.local on mobile devices, connected to the same network. Usually i would just run server from my computer ip in the network: python manage.py runserver 10.0.0.8:8000 And then from any device, going to 10.0.0.8:8000 would show the project im working on. However, now accessing that ip address routes me straight to localhost. So, my question is how to access myhost.local from another device in same network? I don't want to change router settings, if that can be avoided, cos sometimes i work from places where i can't access router admin. Is there any network settings on my computer, that i can change to fix the routing to myhost.local w.o losing access to localhost as well?

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• tcp handshake failed.client send rst (after syn-ack). can any one advice?

  - by user1495181

  architecture: 2 linux computer connected . on the second (192.168.1.1) one run apache server . I have a small program that take tcp packets from nfqueue change the dst ip to 192.168.1.1 in case that the dst ip is 192.168.1.2 (i know that i can do it with iptables , but my program will do more things in the future), fix check sum and return to the queue. if i call to telnet 192.168.1.1 , means that my program dosnt need to do any manipulation, handshake is OK. If i call to telnet 192.168.1.2 , my program change the dest. server get the syn and return syn-ack, but right after getting the syn-ack the client send rst. Can anyone advice? wireshark of the telnet tcpdump of the telenet above

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• Port Forwarding for Remote Desktop

  - by Vaibhav Bajpai

  I have two Mac notebooks at home, I have assigned them static private IPs. I have also set my router to a DynDNS address, which updates everytime my router gets a new public IP. I have enabled Screen Sharing on both notebooks. I can successfully goto my router webpage using the DynDNS address. I understand I need to port-forward to get Screen Sharing to work from outside. Lets assume, notebooks have private IP 192.168.1.2 and 192.168.1.3 I am kind of lost here, would appreciate some help (I need to be able remote desktop to both notebooks)

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• Cisco Aironet 1200 Series AP Configuration

  - by nonterrorist

  I am attempting to configure a new CISCO Aironet 1200 Series Access Point to have a fixed IP. I have been searching online and I have come to the conclusion that the default IP address of this device is 10.0.0.1. These are the steps I have taken: My machine is plugged directly into the Ethernet port (not the Console port) of the AP. My Ethernet adapter is set to 10.0.0.2. I have reset the AP by holding the Mode button while powering up the device. The issue remains that I can not access 10.0.0.1 through the web, nor can I ping that address.

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• Windows Proxy Server advice

  - by Scott

  I have a webserver that currently has about 10 IP addresses. I have various clients that require a proxy server to route their internal traffic through. The load is not that great, so I'd like to have this ONE server act as a proxy server for 10 different clients, each client having their own unique IP on the server. The hardware is already setup, but I'm wondering what software solutions you guys recommend? I've looked at WinGate, Squid-Proxy, etc...but am pretty green with this. Maybe there's even a way to have Windows do this natively? I'm running Windows Server 2008, 32 bit.

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• Asterisk doesn't start properly at system startup. DNS lookup fails.

  - by leiflundgren

  When I start my Ubuntu system it attempts two DNS lookups. One to find out what my internet-routers external ip is. And one to find the IP of my PSTN-SIP-provider. Both fails. [Apr 7 22:14:54] WARNING[1675] chan_sip.c: Invalid address for externhost keyword: sip.mydomain.com ... [Apr 7 22:14:54] WARNING[1675] acl.c: Unable to lookup 'sip.myprovider.com' And since the DNS fails it cannot register properly a cannot make outgoing or incoming calls. If I later, after bootup, restart asterisk everything works excelent. Any idea how I should setup things so that either: Delay Asterisk startup so that DNS is up and healthy first. Somehow get Asterisk to re-try the DNS thing later. Regards Leif

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• First request too slow even if I have a load balancer in the back

  - by adrian7

  I have an Apache 2 on Centos + bind with a wordpress website on it (e.g example.com). I have also set up, on another server in a different contry a load balancer (varnish:80 + nginx 127.0.0.1:8080) for it - which task is to server all static content under /wp-content/. Using Simple DNS editor I added an A entry to cdn.example.com pointing to the server's IP. So no extra work from a 2nd dns server. Then using htaccess I redirect all requests to jpg|gif|css|js files to cdn.example.com. That works and all files are saved on the "cdn" server and served right away. My problem is that for the first time I enter on example.com (e.g after restarting the computer or closing the browser) the load time is 1 up to 3 seconds, while any subsequent page loads take only 300 to 600 miliseconds. I know it might be a DNS issue, but I have done a cache check on several websites and cdn.example.com indicates the right IP. Do you have any ideas where I should dig to solve this first-time slowness?

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• load balancing two web servers each on two different isp's?

  - by Scott

  I have two ISP's that provide me hosting via apache / php / mysql. I am running drupal on them. On occasion the mysql server will go away (crash), so I was hoping to find a reasonable way to have a fail over, if server A SQL is down, all traffic is sent to server B. I know traditionally this is handled in DNS where a second alternate ip is given if there is a problem - or similar. But I do not have control over the isp, other than I can run php, perl and the usual apache stuff. Also, I have static ip's on each isp, and I can create dns entries (A/CNAME/TXT). So, I was hoping there might be a way for me to have a script that checks if drupal has a problem, and if so, somehow alter dns, or ? Or, any other ideas? (other than spending lots more $ on a better isp)

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• understanding my site's DNS records

  - by DaveM

  firstly apologies for using the word 'pointage' this is the word my french domain registrar uses so I may have used to wrong term. OK I would like to better understand what is going on on my 'pointage' record on my domain registrars site. for my (currently empty) web site it reports the following details... Type : Host : Destination A : www.mydomain.org : 62.210.176.146 A : mail.mydomain.org : 84.246.225.176 Mx : .mydomain.org : mail.mydomain.org I think I understand the MX record, that simply relays anything onto the mail.mydomain.org location. However why are the destination for the www and mail domains different. Even more confusing (for me) is the fact that if I ping either of www.mydomain.org or mail.mydomain.org the ping returns a different IP address. This IP address is consistent with that of my server (ie 92.39.247.92). So what exactly is going on ? I'm sure I could find the information on the web,I've read a few thing on the debianhelp site regarding DNS records, and it seems to suggest that the record should be a reverse lookup, but certains isn't the reverse of my servers IP ? but I don't what I should be looking for, so links to docs and search terms for google will be happily accepteed (even though they go against the grain of SO answers to question). thanks in advance. David. ps. I should add that everything seems to work just fine, and I've just descovered this part of the management page of my registrar. Edit: Addition of DNS records and ping results. The DNS record for the site. From what I've read there should only realy be a single 'A' record, so has something gone wrong ? should I change it (remove the extras and then just point www.facilitee.org - .facilitee.org and mail.facilitee.org - .facilitee.org here is the DNS record A www.facilitee.org ? 92.39.247.92 A .facilitee.org ? 92.39.247.92 A mail.facilitee.org ? 92.39.247.92 A webmail.facilitee.org ? 92.39.247.92 MX .facilitee.org ? mail.facilitee.org ping results... ~$ ping www.facilitee.org PING www.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): ~$ ping mail.facilitee.org PING mail.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): So the DNS and the ping correspond, but the 'pointage' doesn't. ~ how can I get a report of the pointage records other than from my registrar ?

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• exim4: multiple domains/IPs

  - by ButterdBread

  On my VPS I have 3 IPs which all have their own domain and their own reverse-DNS records. I have a website on each domain, sending emails. The problem is: the emails are rejected by many hosts because the reverse dns doesn't fit the host in the helo. All the emails are sent from the primary IP and therefore only one of the three domains work. I am looking for a way for exim to check which email adress i'm using to send the email and adapt the domain/IP transmitted in the helo. I have already tried many configurations but nothing has worked up to now. Simply changing MX-Records is impossible too, as I recieve (and also send) email via gmail and I don't want to set up my own webmail. Does anyone know a solution?

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• tc rules block traffic from some hosts at network

  - by user139430

  I have a problem I can not solve. The script, which sets the rules for traffic shaping is blocking the traffic from some hosts.If I remove all the rules, then it works. I can not understand why? Here is my script... #!/bin/sh cmdTC=/sbin/tc rateLANDl="60mbit" ceilLANDl="60mbit" rateLANUl="40mbit" ceilLANUl="40mbit" quantLAN="1514" # Nowaday bandwidth limit set to 100mbit. # We devide it with 60mbit download and 40mbit upload bandthes. rateHiDl="30mbit" ceilHiDl="60mbit" rateHiUl="20mbit" ceilHiUl="40mbit" quantHi="1514" rateLoDl="30mbit" ceilLoDl="60mbit" rateLoUl="20mbit" ceilLoUl="40mbit" quantLo="1514" devNIF=eth0 devFIF=ifb0 modprobe ifb ip link set $devFIF up 2>/dev/null #exit 0 ################################################################################################ # Remove discuiplines from network and fake interfaces ################################################################################################ $cmdTC qdisc del dev $devNIF root 2>/dev/null $cmdTC qdisc del dev $devFIF root 2>/dev/null $cmdTC qdisc del dev $devNIF ingress 2>/dev/null if [ "$1" = "down" ]; then exit 0 fi ################################################################################################ # Create discuiplines for network interface ################################################################################################ $cmdTC qdisc add dev $devNIF root handle 1:0 htb default 12 # Create classes for network interface $cmdTC class add dev $devNIF parent 1:0 classid 1:1 htb rate ${rateLANDl} ceil ${ceilLANDl} quantum ${quantLAN} $cmdTC class add dev $devNIF parent 1:1 classid 1:11 htb rate ${rateHiDl} ceil ${ceilHiDl} quantum ${quantHi} $cmdTC class add dev $devNIF parent 1:1 classid 1:12 htb rate ${rateLoDl} ceil ${ceilLoDl} quantum ${quantLo} $cmdTC qdisc add dev $devNIF parent 1:11 handle 111: sfq perturb 10 $cmdTC qdisc add dev $devNIF parent 1:12 handle 112: sfq perturb 10 # Create filters for network interface $cmdTC filter add dev $devNIF protocol all parent 1:0 u32 match ip dst 10.252.2.0/24 flowid 1:11 $cmdTC filter add dev $devNIF protocol all parent 111: handle 111 flow hash keys dst divisor 1024 baseclass 1:11 $cmdTC filter add dev $devNIF protocol all parent 112: handle 112 flow hash keys dst divisor 1024 baseclass 1:12 ################################################################################################ # Create discuiplines for fake interface ################################################################################################ $cmdTC qdisc add dev $devFIF root handle 1:0 htb default 12 # Create classes for network interface $cmdTC class add dev $devFIF parent 1:0 classid 1:1 htb rate ${rateLANUl} ceil ${ceilLANUl} quantum ${quantLAN} $cmdTC class add dev $devFIF parent 1:1 classid 1:11 htb rate ${rateHiUl} ceil ${ceilHiUl} quantum ${quantHi} $cmdTC class add dev $devFIF parent 1:1 classid 1:12 htb rate ${rateLoUl} ceil ${ceilLoUl} quantum ${quantLo} $cmdTC qdisc add dev $devFIF parent 1:11 handle 111: sfq perturb 10 $cmdTC qdisc add dev $devFIF parent 1:12 handle 112: sfq perturb 10 # Create filters for network interface $cmdTC filter add dev $devFIF protocol all parent 1:0 u32 match ip src 10.252.2.0/24 flowid 1:11 $cmdTC filter add dev $devFIF protocol all parent 111: handle 111 flow hash keys src divisor 1024 baseclass 1:11 $cmdTC filter add dev $devFIF protocol all parent 112: handle 112 flow hash keys src divisor 1024 baseclass 1:12 ################################################################################################ # Create redirect discuiplines from network to fake interface ################################################################################################ $cmdTC qdisc add dev $devNIF handle ffff:0 ingress $cmdTC filter add dev $devNIF parent ffff:0 protocol all u32 match u32 0 0 action mirred egress redirect dev $devFIF Here is my /etc/modules: loop ifb ppp_mppe nf_conntrack_pptp nt_conntrack_proto_gre nf_nat_pptp nf_nat_proto_gre The system is Linux wall 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux

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• Where to find URLs for sources.list for debian for running apt-get update?

  - by Boda Cydo

  Can anyone tell me where to find URLs to put in /etc/apt/sources.list for debian so that I could run apt-get update? I couldn't find the precise answer by searching Google. When I currently try running apt-get update I get: W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/contrib/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/non-free/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] I have no idea how to solve this. Here is how my current sources.list looks like: deb ftp://ftp.debian.org/debian lenny main contrib non-free deb-src ftp://ftp.debian.org/debian lenny main contrib non-free deb ftp://ftp.debian.org/debian lenny/updates main contrib non-free deb-src ftp://ftp.debian.org/debian lenny/updates main contrib non-free I'm running debian_version 5.0.8: # cat /etc/debian_version 5.0.8 Thanks!

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• google video chat works faster on local LAN

  - by bashrc

  Recently the internet speed on our college LAN has dropped drastically. ( Avg file download speed 13 Kbps :( ). However g-talk's video chat remains unbelievably fluent when done with someone within the college's LAN. However video chat is practically impossible for anyone else who is not in the college network. My college has a proxy server through which all computers inside the college connect to the internet. I suspect its due to the proxy server. Also how g-talk maintains video chat? Is it something in the mechanism that speeds up video chat between two clients with the same IP? Since all computers use the same proxy,their IP would appear to be the same to google server.

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• Error configuring virtual hosts

  - by user148351

  i Have a problem using my virtual hosts: When i try to connect to my server on direct ip adress, for example http://111.11.11.111/ in apache error log i see following error: script '/var/www/html/mmm/public/index.php' not found or unable to stat File index.php exists!!! and has correct access rights. I have virtual hosts configured <VirtualHost *:80> DocumentRoot /var/www/html/mmm/public ServerName example.com ServerAlias example.com www.example..com <Directory var/www/html/mmm/public> AllowOverride All </Directory> </VirtualHost> Why when I try to connect to ip address - it try to search index.php not in servers root directory, but in root directory of virtual host.

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• Cisco 2911 - problem with DHCP

  - by bluszcz

  Hi, i am configuring DHCP daemon on Cisco 2911. At some point i assigned address 192.168.50.50 to one box (using MAC address 'relation'). When I wanted to saved config - I got warning, that address 192.168.50.50 is already in Pool, which sounds bit weird - it was first host which I started configuring. I tried with following commands: clear ip dhcp server statistics clear ip dhcp conflict but first one doesn't output anything (and show statistics shows that there are 2 addresses in pool), and second one throws "there is no conflicted ips" message. How I can force/purge/clear/allow to bind 192.168.50.50 to this box?

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• Airpot Express configuration

  - by Christina

  We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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• Superscope DHCP leases and configuration set up

  - by Vdub

  Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only 192.168.50.1 is handing our leases, 192.168.51 wont. here is a summary of our network Gateway: watchguard firebox x750e for our router/gateway at 192.168.50.1 I set up as a secondary IP address 192.168.51.1 Server: Server 2008 r2 standard, running our DNS @ 192.168.50.242 and 8.8.8.8 as a secondary, AD, and DHCP. On that NIC card i have 192.168.50.242 as the IP address and 192.168.51.242 as a secondary. 192.168.50.1 as the default gateway and 192.168.51.1 as a secondary. Im am not very knowledgeable at this but as far as i have researched after adding a super scope and activating scopes, they should automatically start handing out addresses and I cant figure out why only one does. any help at all would be appreciated.

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• vmware workstation - virtual network adapters missing from ipconfig, still show in networking (XP host)

  - by Adam

  Hi Folks - here's a new one for me, and my first time posting here: I installed VMWare workstation 7.1 on a new PC. VMWare properly installs the virtual network adapters under the Network Connections control panel, however for some reason they do not show up under ipconfig, which is very weird. They also don't appear anywhere in "route print". I don't have network connectivity to the VM. My guesses are perhaps some conflict with Symantec AntiVirus or Symantec Client Firewall. Tried the following things: enabling TCP/IP in the virtual network adapters (they often get installed with it disabled for some reason) Restoring defualts in the VMnetcfg gui tool (this causes an uninstall and reinstall of the virtual network adapters on the host) Re-installing vmware workstation Uninstalling checkpoint secureremote and then reinstalling vmware Just to be clear, this problem is totally on the host. In my searching for stuff about (non-vmware) adapters missing from ipconfig, I see some posts about resetting the TCP/IP stack using netsh. Looking into that next... Thanks!

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