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• Bind DHCP Server to Network Bridge

  - by Luke

  My wireless router died, so I decided to route everything through my server. So I installed a second NIC and a wireless card to be my new network: 1 NIC to the Modem, 1 NIC to the switch, and the Wireless to... Well, wireless. Anyways, I got far enough to get DHCP to work on just ONE adapter when I used Internet Connection Sharing (I couldn't get RRAS set up for the life of me), then I decided to try bridging the wireless and second NIC. Now, the DHCP server won't bind to the bridge, but I can enter manual IP's in my clients and it'll connect to the Internet. I also tried changing my wireless adapter's IP to 192.168.0.2, and to 192.168.1.1 to try to set up a separate scope, but to no avail. Running Windows Server 2003

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• Windows XP/7: custom routing for VPN connection

  - by Peter Becker

  We are dealing with a badly configured VPN connection from a vendor, which set up the default gateway but doesn't route traffic anywhere beyond their VPN zone. I managed to do some ad-hoc routing to configure a computer in a way that it can reach the vendor's VPN, our local network as well as the internet. I then tried to turn this into a script, but that failed since the interface number of the VPN changes on every connection. Is there a way in Windows XP and/or Windows 7 to configure custom routing on the client side of a VPN connection? What I would like to do is to have a script running just after the connection comes up that changes the routing table (similar to an ifup script on UNIX).

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• Load balancing and HTTPS strategies

  - by Dan

  I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all clients appear with same IP to our load balancer. I think we are using some hardware load balancing device (can investigate further if necessary). We need to maintain session affinity (site is constructed in ASP), so all requests with same IP get routed to the same node. Since all the communication goes over the HTTPS, no request data (like session Id) is available to balancer as a client discriminator. Is there a way to use some other data besides the IP to distinguish between clients and route the clients even when coming from same IP to different nodes? Note: I need to maintain the traffic between the balancer and nodes safe (encrypted).

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• How can I telnet to an IPv6 host using Mac OS X?

  - by Nate

  I’m testing IPv6 on a corporate network and having problems with OS X. With most IPv6 commands, such as telnet -6 or traceroute6, I get the error: connect: No route to host For example, I have a web server. This fails: $ telnet -6 fe80::… 80 # this fails I know the server is reachable because ping6 works (note that I have to use the -I argument): $ ping6 -I en1 fe80::… # this works And I know the web server is running because I can telnet to it from Windows: C:\> telnet fe80::… 80 # this works I suspect there is some configuration flag or command-line argument that I am missing.

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• Sonicwall with failover, multiple subnets, and preferred WAN interface per subnet

  - by Dan

  I am trying to set up my Sonicwall TZ-210 as follows: Two WAN interfaces (different ISPs), set up in failover mode. Two LAN interfaces with different subnets Each LAN subnet will have a preferred outbound WAN interface, but would failover when necessary. In this way, each ISP is being used for a separate subnet of my network, but both subnets could failover to the other ISP if their primary went down. I know how to do 1 and 2, but I don't know how to do 3. I could set up a route for each subnet to go through a specific interface, but what would happen in the event of a failover? Would it automatically update those routes? Thanks!

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• Site stopped working after adding NIC card

  - by Sachin Kainth

  My boss made a bit of blunder yesterday, he added a secondary NIC card to the a machine hosting a website so that it could be part of the local network. He also added it to the <blah>.local domain (which all our servers are being added too). The website failed following this. He thought this was because the machine was now called <blahblah>.<blah>.local, so he removed it from the domain and restarted. Same problem a asp.net error, something to do with a binding error. Sorry he didn’t make a note of it. He traced it back to the WCF services that are running on the site. Anyway, it looks like ASP.NET gets confused connecting to the database when there’s multiple network cards. The 173.x.x.x IP address (which is internal), doesn’t route to the internet.. Therefore it’s trying to connect via the wrong network. Any ideas about how to resolve it?

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• Converting text file to epub?

  - by jamesh

  I have a bunch of book length text files I'd really like to read on my EPUB reader (as it happens FBReaderJ). What would be the best route to convert them? I have access to OSX and Linux (Ubuntu). Probably happiest with a command line, but would setting for a GUI for batch conversion. My criteria for success are really based upon the shortfalls I have found with Calibre must do the whole book at least a guess of what the title/author may be. Minimum the source filename for the title. hygienic with files it uses - tidies up after itself (this is less important) doesn't try to be an all-in-one library manager (again, less important). is lenient in parsing special characters (e.g. < and & characters).

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• win xp client, win 7 host, only xp drivers

  - by brett

  I have a win 7 64 bit box which has xp on it in a vmware module and also the win7 version. I can use my old usb wifi card under virtual xp as i have the wifi drivers, but apparently the manufacturing company never made any further drivers, nor did it release the source code. Is it possible to get networking between the client and the host, so that my host can browse etc? I thought the microsoft loopback adapter might be the answer but ever example i can find of it's use describes a setup where the host is connected fine and needs to route data to the client as well.

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• Custom/personal dyndns solution?

  - by Eddie Parker

  Hey: I can't think of how to make this work, but it seems like something that should be doable.. I currently own my own domain, and have been using dyndns.com's "custom DNS" to allow me to redirect 'example.com' to my website at home, which is on a dynamic IP. I've now switched over to a VPS solution which hosts my website and allows me root access to a box (me likey), which will now host "example.com" on a static IP. My question is, is it possible for me to somehow make "home.example.com" route to my box at home? Is there any software available that could automate updates to the DNS for this? Ideally I'd like not to pay a service if possible, but if that's the only way then I suppose I'll have to go that way. Thanks!

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• Ping only works after about 30 seconds

  - by Ricardo Polo

  Today I am working on this issue and I would love your ideas. There is a network with something like this LAN 1 -- WAN CHANNEL--- LAN 2 The LAN 1 have two segments. When I make a ping from LAN 1 segment 1 it works like a charm. When I make a ping from LAN 1 segment 2 I have no ping, but after about 30 seconds of continues ping (ping -t) it start to work perfect. After some time of no activity with the destination host the issue happens again. Tracing the route packets stops in the last router before the target. This is the first router in LAN 2 after the WAN channel. In the next screenshot you can see thie issue, the first ping is before a continuos ping and the second one is while continous ping is running. Thank you in advance

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• Are there any 5.1 surround audio switches on the market?

  - by thepurplepixel

  (Somewhat related to this question) I have a set of Logitech 5.1 surround speakers, which use 3 stereo 3.5mm TRS connectors (minijacks) to transfer the audio (the typical green/black/orange audio outputs). I have a Griffin Firewave hooked up to my MacBook Pro, and my desktop has a Realtek ALC889 audio chipset. I have looked for a way to, essentially, switch the speaker inputs between my Firewave and my desktop without having to disconnect the cables from one, route them around my desk, and plug them into the other. I'd love to have something like an old Belkin DB-25/LPT switch, but for these audio cables. Of course, purchasing one and soldering my own cables on the connection terminals is always an option, but, is there a reasonably priced 5.1 audio switch (or 3x stereo) on the market that will accomplish the simple task of switching audio outputs between two computers into a set of 5.1 speakers? Thanks in advance!

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• Best MTA setup for home or laptop computers - not server

  - by thomasrutter

  Hello, What is a good MTA (e.g. Postfix or something else) setup for a home computer behind a NAT, or a laptop that connects to various different wifi networks? I've read a lot of Postfix tutorials on how to set it up this way or that, but they are usually geared towards computers that are servers ie they have a static IP have a domain name are always connected to the same network My requirements are, I guess: Ability to forward mail for "root" to another server of my choosing. No listening for incoming SMTP connections - outgoing only Ability to route outgoing mail via an external SMTP server with authentication (and perhaps encryption) If not Postfix, I need an MTA which can queue up mails in case it temporarily has no internet connection.

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• Internal only DNS?

  - by ethrbunny

  We are running a research project with hundreds (becoming thousands) of remote hosts. Each host is running OpenVPN so we can find them regardless of what their 'assigned' IP is. We have been using DynDNS to manage this but we're running into some issues with them ( API is weak/nonexistent, size constraints, etc). Im looking into setting up a internal-only domain (EG "our.stuff" so a host would be "site1.our.stuff" or "site3.net4.our.stuff") that I can configure with the info from the OpenVPN server. Since we'd have to point our internal DNS to this machine it would have to be able to route/cache requests for 'external' machines as well. I've been trying to read about 'internal DNS', 'private', 'non-routeable' but I'm not having much success. Summary: need info on internal, caching DNS server. Something with open-source would be ideal. If not, I can script out changes to .conf, etc.

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• Can't connect to a machine via Cisco VPN on Mac

  - by Alex

  Hi there, I have a curious problem. I can connect to work's vpn using Cisco VPN Client. I can get internet through that vpn. When I go check the IP online it tells me the IP address of the server I connected. However, when I try to ping one of the machines at work I get nothing. And traceroute says there is no route to the destination. But works for google. Any ideas? Is some traffic not sent through the VPN on mac Alex

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• VPN only connects to its server!

  - by Eddie

  Hi guys; Previously I bought a windows 2003 VPS and enabled routing and remote access so that users can make a vpn connection. I turend the firewall off and everything was working fine. But since 2 days ago whenever I try and connect to vpn it connects to vpn without any problem and I can see the connection status however it only connects to the server I mean what I can do with this vpn is to connect to the server via remote desktop and I can ping only the server's IP, neither I can open any webpages in browsers or ping other IP addresses beside the server one! I've also rebuilt the server and configured it for routing access and vpn connection from the beginning but it doesn't work either. It seems that server fails to route the traffic properly, as i'm sure that the firewall has been turned off I can't figure out what's the reason, any idea what's going on? Thanks in advance

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• Use pt-table-sync to setup a new MySQL DB

  - by Generation D Systems

  I have 2 hosts (A and B). B contains a MySQL server with a database called mydb, and A contains a MySQL server with nothing (fresh install). I want to replicate the entire mydb from B to A, by running a script on A (I do not have shell access to B). Can I run this on A: pt-table-sync --execute h=b.mydomain.com,D=mydb h=a.mydomain.com I've read the docs but don't get a 100% comfort feeling (perhaps because of all the warnings about damaging your data if you don't know what you're doing). Will this work? as well, is h=a.mydomin.com necessary? (Will it route all traffic back in/out the local NIC?) can I use localhost or nothing at all?

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• Public IP Routing over Private GRE tunnel

  - by Paul

  I have a GRE tunnel configured between two linux boxes. The tunnel works fine. I can ping from each host the other private ip. Head privateip: 10.0.0.1 publicip: 8.8.8.8 Tail privateip: 10.0.0.2 publicip: 7.7.7.7 The public IP on Tail has the network block 9.9.9.0/23 statically routed over the 7.7.7.7 interface. The idea is to make the 9.9.9.0/23 ips work on servers on the 8.8.8.8 network. I configure the tail host to route the /23 block. I mounted a 9.9 IP on the head server. I can ping the 9.9 ip from the tail to the head. I can't ping the 9.9 ip from the public internet. I think I need to add some other routes because of gateway issues, but I can't seem to wrap my mind around it (not a router guy, just beating my way through something that I have never done before and vaguely understand) --danks

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• Should I use an ssl terminator or just haproxy?

  - by Justin Meltzer

  I'm trying to figure out how to set up my architecture for a socket.io app that will require both https and wss connections. I've found many tutorials on the web suggesting that you use something like stud or stunnel in front of haproxy, which then routes your unencrypted traffic to your app. If I were to go this route, is it suggested that haproxy and the ssl terminator be on separate instances, or is it fine if they are on the same EC2 server instance? If I do not want to use a separate ssl terminator, could I use haproxy to terminate the ssl? Or instead would it be possible to proxy these https and wss connections to my application and have the node app terminate the ssl itself?

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• Setting up Ubuntu Server on Amazon EC2 for hosting multiple domains with wildcard subdomains

  - by Ashish Kumar

  I'm trying to set up multiple domains on my Amazon EC2 micro instance running Ubuntu Server 12.04. I installed Apache correctly and set up virtual hosts but having problems with wildcard subdomains. This is what my httpd.conf file looks like NameVirtualHost *:80 <VirtualHost *:80> UseCanonicalName Off VirtualDocumentRoot /home/username/domains/%0/html/ </VirtualHost> My DNS records (on Amazon Route 53) are: domain.tld A 1.2.3.4 *.domain.tld A 1.2.3.4 If i create a test.domain.tld directory with the html subdirectory, it works fine. But what I want to do is to redirect *.domain.tld to domain.tld in case there is no directory for the sub-domain accessed. I would also like www.domain.tld to redirect to domain.tld. The system should also work if I decide to host another website, example.com, on the server. I tried Googling a lot but without any luck. Suggestions?

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• Set up internal domain to use external SMTP in Exchange 2007

  - by Geoffrey

  I'm moving to Google Apps and have setup dual-delivery. Everything is fine, but for mail sent internally (from [email protected] to [email protected]), Exchange is not using the send connectors I have pointing to Google's servers. I believe my question is similar to this question: How to force internal email through an smtp connector in exchange 2007 Again, if a user is connected to the Exchange server and tries to send to [email protected] it works just fine, but I cannot seem to force *@mydomain.com to route correctly. This should be a fairly simple, but according to this: google.com/support/forum/p/Google+Apps/thread?tid=30b6ad03baa57289&hl=en (can't post two links due to spam prevention) It does not seem possible. Any ideas?

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• accessing a web server from the LAN and WAN

  - by jessh

  My router does not support loopback. In order to view a webpage on my server, I either have to type in the local ip (192.168.1.201), or be on another network. What are my options for making this easier? Here are some possible things: Route all web traffic through an external proxy (seems to be overkill) Run my own DNS server (where to start?!) Buy a new router that supports loopback. Surely there is another way that I can use my laptop on the LAN and the WAN by typing in my domain more easily than these solutions.

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• Linux networking crash: best steps to find out the cause?

  - by Aron Rotteveel

  One of our Linux (CentOS) servers was unreachable last night. The server was not reachable in any way except for the remote console. After logging in with the remote console, it turned out I could not ping any outside hosts either. A simple service network restart solved the issue, but I am still wondering what could have caused this. My log files seem to indicate no error at all (except for the various daemons that need a network connection and failed after the network failure). Are there any additional steps I can take to find out the cause of this problem? EDIT: this just happened again. The server was completely unresponsive until I issued a networking service restart. Any advise is welcome. Could this be caused by a faulty hardware component? As per Madhatters request, here are some excerpts from the log at the time (the network crashed at 20:13): /var/log/messages: Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=101 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=100 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=101 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:13:34 graviton junglediskserver: Connection to gateway failed: xGatewayTransport - Connection to gateway failed. The first three messages are simple responses to iptables rules I have set up through the LFD firewall. The last message indicates that JungleDisk, which I use for backups can no longer connect to the gateway. Apart from this, there are no interesting messages around this time. EDIT 4 dec: as per Mattdm's request, here is the output of ethtool eth0: (Please not that these are the settings that currently work. If things go wrong again, I will be sure to post this again if necessary. Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes As per Joris' request, here is also the output of route -n: aron@graviton [~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.xx.xx.58 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.42 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.43 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.41 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.46 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.47 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.44 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.45 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.50 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.51 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.48 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.49 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.54 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.52 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.53 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.0 0.0.0.0 255.255.255.192 U 0 0 0 eth0 xx.xx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 xx.xx.xx.62 0.0.0.0 UG 0 0 0 eth0 The bottom xx.62 is my gateway. EDIT december 28th: the problem occurred again and I got the chance to compare some of the outputs of the above tests. What I found out is that arp -an returns an incomplete MAC address for my gateway (which is not under my control; the server is in a shared rack): During failure: ? (xx.xx.xx.62) at <incomplete> on eth0 After service network restart: ? (xx.xx.xx.62) at 00:00:0C:9F:F0:30 [ether] on eth0 Is this something I can fix or is it time for me to contact the data centre?

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• Linux box acting as wireless access point to share the internet connection

  - by Suresh

  A linux machine is connected to internet over two interfaces ppp0 and ppp1 using two modems. Also this machine acts as wireless access point through an interface say, eth0 with ip address 192.168.1.1 and acts as gateway for the connected devices through this network with subnet mask 255.255.255.0 Now is it possible to achieve the following: When any of the connected devices through wireless AP needs internet connection linux machine has to use ppp1 interface for internet. If any of the applications on the linux machine needs internet connection linux machine should use ppp0 interface for the internet. Can this be achieved by adding rules to chains in filter/nat tables? If the kernel routing table has a default rule to route the default traffic through interface ppp0, wil kernel completely ignore ppp1 for internet? PS: new to networking and routing concepts, If the question is not clear leave a comment, will try to give more information.

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• DNS servers via RA in IPv6

  - by glglgl

  Some time ago, RFC 6106 was created, which states how a router tells the clients about the DNS server to be used. It is a new standard, it has to be implemented, which needs time etc. I'm courious about the need for it: wouldn't have it been better to define a "globally valid" anycast address for DNS? Queries would be sent to this address and would be promoted along the default route until there is a host which claims to be responsible for it. In an enterprise network, that would be a central DNS server (or even more, on really big companies); in a SOHO network, it would either be the router or the DNS server of the ISP, in a root server hosting data center, it would be the DNS of the hoster, etc. What do I see wrong here? Do I have a wrong view of the anycast concept?

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• Need help setting up mail DNS records

  - by Dave

  Hi, We are hosting our web site on host monster, but want our email to continue to be hosted at the old site. Our domain points to the hostmonster DNS servers, but I can't figure out the right configuration for the remote email servers. We have one MX entry, which is priority: 0 domain: ourdomain.com And then we have these DNS entries ... name: mail.ourdomain.com ttl: 14400 class: IN type: A record: old.host.ip.address name: mail1.ourdomain.com ttl: 14400 class: IN type: A record: old.host.secondip.address Can someone tell me what I need to add/edit to get mail to correctly route to our old host? Thanks, - Dave

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