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• Assign two static IP addresses to one mac address

  - by Timo Ylikännö

  Can Isc-dhcp-server give two static ip addresses to one mac address? I have several home terminals in my network. Each terminal have two interfaces. One for public traffic and one for a management traffic. Both interfaces have same mac address. DHCP server can detect interfaces via dhcp option field and dhcp class declarations. Every terminal have to have static ip address instead of dynamic address. With dynamic address and dynamic pools this would be an easy task. Or is there any dhcp server that can do this?

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• DHCPD Offering ip address on wrong subnet

  - by Logan

  I just recently added a new subnet for our wireless network to our DHCP configuration for the 192.168.254.0 subnet. Most of the time when wireless clients connect it works just fine. However, sometimes on seemingly random occasions the DHCP server will send out a DHCPOFFER with an IP address on the wrong subnet. Example: dhcpd: DHCPDISCOVER from MACADDRESS (ThinkBook2) via 192.168.254.1 dhcpd: DHCPOFFER on 192.168.22.236 to MACADDRESS (ThinkBook2) via 192.168.254.1 Here is the subnet configuration in dhcpd.conf: subnet 192.168.254.0 netmask 255.255.255.0 { option routers 192.168.254.1; range 192.168.254.34 192.168.254.254; default-lease-time 14400; authoritative; } How can I make sure the server always sends out an IP address on the right subnet?

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• Gathering IP's from a complicated log

  - by Harry

  I have a question regarding the use of some more advanced grep, awk, sed. I have a log file, for a proprietary MTA, that contains IP's in a string, delimited by [redacted]^~x.x.x.x^[redacted]. So far all of my grepping, awking, and sedding hasn't gotten me very far. This log file has 331520 lines in it. My goal was to simply grep out the ip's, then do a for loop with sed, to sed 's/$i/redacted'. I'm including a sample of one of the log entries. If you all have any idea, I would be greatly appreciative. Jun 4 15:21:52 host.name mta-name: 13388^~88/CC-04671-FCA0DCF4^~D^~<redactedmessageid>^~@^[email protected]^~redacted.hostname^~000.00.000.000^~port^~esmtp^~^~external_routing_nobounce^~0^~0.51^~subjectofmessage^~250 2.6.0 <redactedmessageid> [InternalId=2178458] Queued mail for delivery

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• MySQL Workbench sends computer name with login not IP

  - by Android Addict

  I am attempting to connect MySQLWorkbench to a remote MySQL Server. The server has granted access to user@IPAddress However, when I try to connect MySQLWorkbench, it sends user@computername instead. How do I configure the connection to use the IP address instead in MySQLWorkbench? Reference: The remote server is on the local network, so I need to use the local IP address assigned to my client. EDIT What I have tried so far: from the server: mysql -u user@IPAddress -p --host=(ServerIPAddress) Returns: mysql> So that tells me the user account is operational. Furthermore, I confirmed it exists using: select user from mysql.user; returning a table of all users, of which the user I am using is present. I have also opened the port 3306: sbin/iptables -A INPUT -i eth0 -s clientIPAddress -p tcp --destination-port3306 -j ACCEPT Still I encounter Access Denied

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• Does IP helper forward subnet broadcasts?

  - by Eamon

  Hi, I have a device on a VLAN that uses UDP subnet broadcasts to advertise its presence to similar devices. This works fine on a single VLAN, but now I need to allow it to communicate with similar devices on a second VLAN. I thought of using the IP helper command in the router, but I am wondering if that only forwards global broadcasts (255.255.255.255)? My device sends out a subnet broadcast (e.g. 192.168.6.255) Will IP helper change the destination address to the target subnet (e.g. 192.168.7.255)? Eamon

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• Looking for a external soundcard with midi

  - by Chris

  Can someone help me pointing to a soundcard (external) with midi ports?

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• How to setup heartbeat for IP fail over on SSH failure

  - by Tony

  I wonder if anyone can help me, I am trying to setup heartbeat on a redhat 5 to failover an IP address when ssh stops responding on a server. So basically you ssh to a VIP and then get put through which ever server has the floating ip. 192.168.0.100 | | /------------------------\ | /------------------------\ | Server 01 | | | Server 02 | | eth0 - 192.168.0.1 |-----/ | eth0 - 192.168.0.2 | | eth0:0 - 192.168.0.100 | | eth0:0 - down | \------------------------/ \------------------------/ if ssh stops responding i want eth0:0 to be brought up on the second machine to allow ssh connections to carry on being served. I have tried to follow some documents I have found online so here is my current configuration: ha.cf bcast eth0 keepalive 2 warntime 10 deadtime 30 initdead 120 udpport 694 auto_failback off node vm-bal01 node vm-bal02 debugfile /var/log/ha-debug logfile /var/log/ha-log authkeys auth 1 1 sha1 sshhhsecret1234 haresources server01 192.168.0.100/24/eth0:0/192.168.0.255 Hope someone can help as this is driving me nuts...

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Weird DNS bug - external server resolves to internal IP

  - by emilecantin

  I have a server that is hosted by my university. I have root access, but no control over network setup, firewall, etc. This server's DNS resolves to an internal IP here on campus (10.x.x.x), and an external IP outside campus. I also have a few servers hosted at Amazon, and they mostly work well. However, one of them started to resolve the university server by its internal IP address. This causes problems, as 10.x.x.x on Amazon EC2 is someone else. I have connected to the Amazon server with SSH agent forwarding a few times in the past, to access a Git repository on the university server. Any idea what could cause this? EDIT: Here's my /etc/resolv.conf # Generated by dhcpcd for interface eth0 search ec2.internal nameserver 172.16.0.23 Here's the output of dig myserver.myuniversity.ca.: ; <<>> DiG 9.8.1-P1 <<>> myserver.myuniversity.ca. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34470 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myserver.myuniversity.ca. IN A ;; ANSWER SECTION: myserver.myuniversity.ca. 537586 IN A 10.43.x.x ;; Query time: 2 msec ;; SERVER: 172.16.0.23#53(172.16.0.23) ;; WHEN: Wed Nov 28 16:07:21 2012 ;; MSG SIZE rcvd: 60 Here's the expected output (on another Amazon server): ; <<>> DiG 9.8.1-P1 <<>> myserver.myuniversity.ca. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8045 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myserver.myuniversity.ca. IN A ;; ANSWER SECTION: myserver.myuniversity.ca. 601733 IN A x.x.239.1 ;; Query time: 1 msec ;; SERVER: 172.16.0.23#53(172.16.0.23) ;; WHEN: Wed Nov 28 16:09:36 2012 ;; MSG SIZE rcvd: 60

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• Forward one RDP port on one machine to multiple external users at the same time

  - by matnagel

  We have a windows server 2003 machine with rdp service listening on the standard port 3389. For security reasons this port is not opened on the router, but we have freesshd service running and a remote admin can login via ssh and this port is forwarded to external port 33001 for the first external user. This works great. Now we have another admin who wants to work remote (he uses a different windows account, but needs to work on the same machine.) So this is basically a ssh port forwarding question. Will the other user be able to login at the same time using the same port 33001 ? Please keep in mind that there will be a second tunnel, and this second tunnel will also use the local port 3389 on the windows server.

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• Creating a bootable external drive in OSX

  - by Brian Postow

  I want to do some slightly dangerous testing, testing an install package I've written, so I've got an external drive, and I want to make it a bootable OSX disk, then I can boot up on the external, do my install, and if it screws things up, it doesn't actually affect the usability of my machine. The problem is that when I stick the disk that came with my computer (It's actually another computer in the office, but they're both minis) in and try to run the installer, it says "You cannot install OSx 10.6 on this computer". Now, the computer is ALREADY running 10.6, so that's a kind of silly error message... It does this when I boot to the DVDRom as well. Am I doing something really really dumb? or what?

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• Configure IIS to rewrite IP Address to Site Name

  - by Bath Man

  So i've started my first web site from home, and I'm trying to get it up and running and google crawlable and the like, but I can't seem to figure out how to have my site name returned in the address bar instead of my IP address. I've purchased a domain name for my site on Godaddy and then set it to redirect to my site. When you type in the domain name, you get redirected to http://0.0.0.0/default.aspx (not my real IP obviously), and that stays in the user's address bar. In order to fix that temporarily, I've set up masking on Go Daddy which keeps the URL in the address bar, but just shows my website in a frame. This is fine for users visiting the site, however any kind of automated robot such as GoogleBot cannot discover my content because of the frame. I've looked into ISAPI filters and server-site-rewriting, and the like... but I just can't quite figure out how to do what I need it to do. Any simple suggestions or links would be appreciated.

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• VPN Error 868 when connecting even if using IP address

  - by Fr33dan

  I am trying to connect to a public VPN from VPNGate. However when I attempt to connect to a VPN from the list using MS-SSTP protocol I get the following error: Error 868: The remote connection was not made because the name of the remote access server did not resolve. If I open a command prompt and ping the address in question it resolves to the IP shown on the listing. If I configure the VPN using that IP address directly I still receive the error even though the name no longer needs to resolve. This was working yesterday but it seems the VPN I was using has been removed from the list. What is happening and how can I fix it?

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• Proxmox 31 + KVM routing + IP subnet + csf

  - by KeyJey

  We have proxmox 3.1 server in netzner with routuing network and IP subnet block. We want to implement csf firewall without interfering the traffic of the KVM VMs, what would be the easiest way? We readed that we should add this lines to /etc/csf/csfpost.sh: iptables -A FORWARD -d 144.76.223.155 -j ACCEPT iptables -A FORWARD -d 144.76.223.156 -j ACCEPT iptables -A FORWARD -d 144.76.223.157 -j ACCEPT iptables -A FORWARD -d 144.76.223.158 -j ACCEPT iptables -A FORWARD -d 144.76.223.159 -j ACCEPT iptables -A FORWARD -d 144.99.183.323 -j ACCEPT But when we enable csf the ping breaks, this is the network config (IPs are modified): auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address 144.76.166.100 netmask 255.255.255.255 pointopoint 144.76.183.97 gateway 144.76.183.97 # for single IPs auto vmbr0 iface vmbr0 inet static address 144.76.166.100 netmask 255.255.255.255 bridge_ports none bridge_stp off bridge_fd 0 up ip route add 144.99.183.323/32 dev vmbr0 # for a subnet auto vmbr1 iface vmbr1 inet static address 144.76.166.100 netmask 255.255.255.248 bridge_ports none bridge_stp off bridge_fd 0 Thanks in advanced ! :)

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• Windows XP SP3 TCP/IP No buffer space available

  - by Natalia

  I have the exactly same problem as here: Windows XP TCP/IP No buffer space available On Windows XP Pro, SP3 if one does an experiment where one tries to open TCP/IP sockets in a loop (bascially, listen port 7000, listen port 7001, etc.) After approx 649 open sockets, one will start getting errors: No buffer space available (maximum connections reached?) I've tried to edit the registry as described here http://smallvoid.com/article/winnt-tcpip-max-limit.html I set MaxUserPort = 65534 and MaxFreeTcbs = 2000, but it didn't help. What else can I do? I need 1000 server sockets. Here is the error stack: 05.04.2012 10:23:57 java.net.SocketException: No buffer space available (maximum connections reached?): listen at sun.nio.ch.ServerSocketChannelImpl.listen(Native Method) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:127) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:52) at channelserver.NIOAppServer.initSelector(NIOAppServer.java:40) at channelserver.NIOAppServer.(NIOAppServer.java:27) at channelserver.NIOServer.main(NIOServer.java:433) at channelserver.NIOServer.main(NIOServer.java:438)

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• Internal+external interfaces with multiple default gateways on win2003

  - by fileitup

  Im trying to set up several web servers for a load balanced cluster and need to have each server connected to the internal network (for load balancing) as well as to an external network (internet - for administration). I have two NICs but since I cant set two default gateways I have the external gateway as default and the internal as a route rule. This setup only works half way - the internal network is fine but I cant log in from outside or see the web from the box. If I switch the gateways remote login/web will work, but the internal wont. Im sure someone encountered this before but wasnt able to find anything online. Any help will be appreciated.

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• Metro Apps on Win 8 aren't working with static ip behind auth proxy

  - by Kamal

  In Windows 8 Professional, Metro Apps and Windows Update do not work on static IP settings behind authenticated proxy server. They work on DHCP on the same proxy settings. (We have DHCP for wifi and static IP for LAN, both using the same proxy server). IE, Chrome and other desktop apps work nicely on both. Metro apps worked on an auth proxy (DHCP only), when I changed their proxy settings from the 'edit group policy' option. (StartSettingsEdit Group PolicyComputer ConfigurationAdministrative TemplatesNetwork IsolationInternet Proxy for Apps) Can this be fixed?

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• How to forward UDP and TCP traffic from one IP to another

  - by Rishabh Agnihotri

  Well i have a server with two LAN Card Installed.I have a server in U.S and one in India.I have created a GRE tunnel to route all traffic from U.S Server to my Indian Server.My Traffic has UDP,TCP,HTTP,etc Traffic.Now i have two LAN Card on my Indian Server.Well i have configured two IPs on the system for some of my needs on the system.One is a /30 and another is a /24.Well now i want the /30 IP to talk to my /24 IP.Lets take a e.g the IPs are 180.151.130.34 - /30 and 103.243.19.254 -/24 I want to forward all the TCP,UDP,HTTP,etc like traffic coming to 180.151.130.34 to 103.243.19.254.In the sense i want to make them talk to each other in a way if a TCP/UDP Packet comes to 180.151.130.34 it should be forwarded to 103.243.19.254 and then that packet is sent back by 103.243.19.254 to 180.151.130.34.I am not able to configure this part.Can anyone tell me step by step how to do so? Well i forgot to specify i am using Windows Server 2008. Any help would be greatly appreciated.Thanks in advance.

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• Get sessions' remote IP from Teamviewer log file

  - by etuardu

  I'd like to know who has logged in to my machine and when. I have two TeamViewer log files: Connections_incoming.txt and TeamViewer7_Logfile.log. The first one is quite plain and lists, as its name says, the incoming connections to the machine, reporting the local name of the remote host, login time, logout time, and some ids. e.g.: 173274362 MYLAPTOP 20-02-2012 17:32:16 20-02-2012 17:50:42 Master RemoteControl {C5AAE483-ED0B-54B8-9235-7AE597CAD342} This is almost all what I need, but unfortunately no remote IP address is reported here, so I checked for IPs in TeamViewer7_Logfile.log but it is really messy. It indeed contains some IP addresses but I can't understand which one is bound with the items in the first log file. Is there a way to interpolate the two logs to get what I need? Should I search the second file for some particular text? What do you suggest?

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• IIS Seems to Forward Domain/IP to Domain Controller

  - by asinc

  We have a server (Server 1) with Win 2008 that is accessible by RDP and also is set as the primary DNS IP for a domain (example.com). This server is on the same network as an SBS 2008 server (Server 2) which is the domain controller and internal Dns server. Web requests going to example.com with IP of Server 1 are being passed to Server 2 and served up by IIS from Server 2. What causes this to happen? Is there a safe way to have Server 1 IIS handle the web requests which was our expected outcome? Example: DNS entry on ISP: example.com = 111.111.111.111 Server 1 = 111.111.111.111 Server 2 = 111.111.111.112 Web user goes to example.com in browser, and the page is actually returned from 111.111.111.112?

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• Known Hosts ECDSA Host Key Multiple Domains on One IP

  - by Jonah

  Hello, world!, I have a VPS set up with multiple domain names pointing to it. Arbitrarily, I like to access it via SSH through the domain name I'm dealing with. So for example, if I'm doing something with example1.com, I'll log in with ssh [email protected], and if I'm working with example2.com, I'll log in with ssh [email protected]. They both point to the same user on the same machine. However, because SSH keeps track of the server's fingerprint, it tells me that there is an offending host key, and makes me confirm access. $ ssh [email protected] Warning: the ECDSA host key for 'example2.com' differs from the key for the IP address '123.123.123.123' Offending key for IP in /home/me/.ssh/known_hosts:33 Matching host key in /home/me/.ssh/known_hosts:38 Are you sure you want to continue connecting (yes/no)? Is there a way to ignore this warning? Thanks!

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• htaccess IP blocking with custom 403 Error not working

  - by mrc0der

  I'm trying to block everyone but 1 IP address from my site on a server running apache & centos. My setup is follows the example below. My server: `http://www.myserver.com/` My .htaccess file <limit GET> order deny,allow deny from all allow from 176.219.192.141 </limit> ErrorDocument 403 http://www.google.com ErrorDocument 404 http://www.google.com When I visit http://www.myserver.com/ from an invalid IP, it gives me a generic 403 error. When I visit http://www.myserver.com/page-does-not-exist/ it redirects me correctly to http://www.google.com but I can't figure out why the 403 error doesn't redirect me too. Anyone have any ideas?

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• Accessing C$ over LAN on Win2008R2 - cannot by hostname but can by IP and FQDN

  - by Idgoo

  Having an issue with one of our Win2k8 R2 file servers. Trying to access C$ or the Admin share is giving us an error (see error details that the bottom), however we are able to connect using the server's IP and FQDN. can access \\172.16.x.x\c$ with domain cred can access \\server.domain.local\c$ with domain creds cannot access \\servername\c$ with same domain creds Server pings fine with Hostname, IP, FQDN, the Primary DNS suffix is also correct. DNS, PTR and Wins records are all correct for the Server I have checked that I am not trying to connect with cached credentials in the Windows vault, the server is also appending primary and connection specific DNS suffixes to the hostname. Any ideas what might be causing this issue? Error Details: c$ 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

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• external pop email relay

  - by Pixman

  I want to offer to my customer this possibility : get her pop3 emails from external pop3 server forward the news emails to the new external pop3 server I have find lot of tools for sync imap accounts, or sync pop to imap, but i just want get pop and send to another email adress ! I search a answer for linux ( if i can make a simple daemon for make it's it's good ). Thanks a lot for your help. edit for more detail : For simplify my question, in my use case, it's just want to connect as client via pop protocol ( like a mail app ). And i check news emails, and forward to other email adress. I search about an app or code for create this on linux. In this situation have no access to mailbox dirs, or server configuration ( in this case i have already the answer by create a qmail hook ) Maybe, it's not the good website ? my question must be post on the stackoverflow part ?

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• How to stop ethernet interface in bridge configuration from obtaining IP address via DHCP

  - by user71061

  Hi! I'm trying to configure openvpn in bridging configuration. First step of doing this requires creating bridge interface (br0), bridging together physical ethernet interface (eth0) and logical tap0 interface. This can be done with simple script but I want to use less popular approach, configuring bridge interface entirely via /etc/network/interfaces file (on Debian linux). So I have removed all eth0 definitions form /etc/network/interfaces and replaced if with following br0 definition: auto br0 iface br0 inet static pre-up openvpn --mktun --dev tap0 address 10.0.0.1 netmask 255.255.255.0 bridge_ports eth0 tap0 post-down openvpn --rmtun --dev tap0 This works as I expected, but there is only one problem: interface eth0 is part of bridge interface br0 AND it also receive it's own IP address from my DHCP server (located on same LAN where eth0 is connected). My questions is: how to stop eth0 interface from obtaining it's own IP address? (It should only be part of br0 bridge).

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