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• Routing connections to passthrough a local machine

  - by xiamx

  Please tell me if what I'm trying to do is feasible. I have a router named "R" which is connected to WAN. R allows adding rules to the routing table. There are numerous of machines connected to the LAN port of R, they all have ip addresses 192.168.1.* assigned with DHCP on R. Among those machines, there's a machine C with ip address 192.168.1.100. I want all traffic of other machines in the subnet to pass-through machine C where some filtering and logging will be done. Is this possible? Is there a name for what I'm trying to do? (so i can do more googling later)

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• .htaccess redirect not preserving http_referer header

  - by CodeToaster

  We're merging with another company, and we want to redirect content from their (Apache) website to our (IIS) site. When traffic arrives at our site, we inspect the HTTP_REFERER, and if the visitor was just redirected from the company's site that we just merged with, they'll be presented with a "splash" page announcing the merger. I've added the line... Redirect / http://www.oursite.com/ ...to their .htaccess, which works fine, except that when the browser is redirected it doesn't send the HTTP_REFERER header. I've tried redirecting with redirect codes 301, 302 and 307 (the default, I believe, is 302) and all have the same effect (redirects fine, but no HTTP_REFERER). Can anyone provide some insight into why HTTP_REFERER wouldn't be included?

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• .htaccess redirect, from old dirty URL to a clean new URL with parameters

  - by JustAnil

  I have the following 2 links, I'm not great with .htaccess rules yet. Old URL: http://www.mywebsite.org.uk/donate/donate.php?charity_id=885&project_id=18111 New URL: http://new.mywebsite.org.uk/donation/to/885/18111 I want all the traffic coming from the old URL to the new url (including the parameters charity_id & project_id). I'm trying to learn .htaccess rules, but finding the tutorials online to be kinda vague. I'd really like a simple explanation on the .htaccess rules. (Give a man a fish, feed him for a day, teach a man to fish, feed him for a lifetime). The correct answer will be the answer with a simple and useful explanation (along with the rules if possible!).

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• Need advise on linking apache and tomcat

  - by hsnm

  I have been searching this for hours with no luck. I have a web server that uses https on Apache2. I also have installed tomcat7 on the same server to run some Java webapp on it. I need to keep my https port 443 on Apache but forward the requests to the Java webapp to tomcat. I tried to use mod_jk to redirect the requests to tomcat but I failed. Most tutorials talk about redirecting plain http requests not https. I also could not let tomcat use https on 8443. I'm following the steps here but facing errors. The question: Can I redirect https traffic to tomcat without installing https on tomcat? Is there a good tutorial you can recommend to me?

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• Reverse proxy with SSL and IP passthrough?

  - by Paul

  Turns out that the IP of a much-needed new website is blocked from inside our organization's network for reasons that will take weeks to fix. In the meantime, could we set up a reverse proxy on an Internet-based server which will forward SSL traffic and perhaps client IPs to the external site? Load will be light. No need to terminate SSL on the proxy. We may be able to poison DNS so original URL can work. How do I learn if I need URL rewriting? Squid/apache/nginx/something else? Setup would be fastest on Win 2000, but other OSes are OK if that would help. Simple and quick are good since it's a temporary solution. Thanks for your thoughts!

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• Troubles doing transparent proxy for virtual machines

  - by Dan H

  Hi iptables gurus. First here is the basic topology: Internet | Gateway | Workstation---eth0---virbr0 | +-----+-----+ | | | vm1 vm2 vm3 I need to test a traffic analyzer running on my workstation, listening on some port (say 8990) on eth0. The rule [I think] I want is "any packets leaving virbr0 going anywhere to port 80 must instead go to port 8990 on eth0". My software running on port 8990 does its own check of the NAT packet mangling to push the packets through after it inspects them. I've been banging my head on this, with different variants of: iptables -t nat -A PREROUTING -i virbr0 -p tcp --dport 80 -j DNAT \ --to 10.0.0.10:8990 And I've tried the more generic method of using the mangle table with --set-mark and ip rule add fwmark, but I'm not getting it. I guess what's confusing me is that everything runs on the same box. Thanks for any guidance.

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• is it possible in this case to get two IPv6 networks to communicate over the IPv4 Internet?

  - by user239167

  I have a setup of a laptop connected to a cellular IPv4 network (3G usb dongle) and PC connected to another IPv4/IPv6 network. Both have been configured to run as IPv6 routers and each has its IPv6 network. The laptop connects to the Internet via the 3G network with IPv4 address (private one and it is mostly changing) on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:444::/64). The PC connects to the Internet via the organization network with both public IPv4 and IPv6 addresses on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:222::/64). Both running Linux Ubuntu. Is it possible to get the two IPv6 network (2001:db8:222::/64 and 2001:db8:444::/64) to communicate over the IPv4 Internet? Is openvpn of any good in this case to get IPv6 traffic over IPv4-IPv4 tunnel? Thanks for helping in advance

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• SharePoint 2010 MySites - Host on separate servers

  - by Chris W

  We're playing with the SP 2010 Beta ahead of a planned deployment later this year in an academic environment. We anticipate that the majority of traffic will be through MySites when everything is provisioned so we're looking at how we can plan our SP topology to scale nicely. An initial thought is to run the main portal on one server, host "Student" MySites on one server and "Staff" on another. Is it acutally possible to do this easily or are we going down a bad path? Specifically - can we have 2 different MySites site collections, each hosted on a dedicated server? If so, can we configure SharePoint to work out from the users's logon account type of user they are and route them to the correct server?

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• nginx: URL rewrites and performance

  - by j0nes

  I have a website where I need to change the URL structure. The old URLs look like /olddir/part1_de.htm, the new ones will look like /newdir/sub/category/anotherpage.htm. There are a lot of URL rewrites I need to do, I assume about 500 distinct rewrites in the end. As my website gets quite a lot of traffic, my main concern is about performance at the moment. My questions are: I assume that for each request, the rewrites block will be parsed and the regex will be evaluated. Am I right? Will there be a performance penalty if I use these rewrites? Can nginx handle this? Are there any "best practices" to follow when doing a lot of rewrites?

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• Windows PC's Intermittant Network faults.

  - by Kristiaan

  Hello everyone, im running into some issues with our client PC's (windows xp sp3 systems). this morning we ran into some problems with PC's not connecting to internal / external systems intermittantly. this would manifest as a problem connecting to any service, email, web, backoffice database systems etc. given a random amount of time be it a few minutes etc the problem would disapear and the pc would carry on as normal, some systems however have not been able to connect to certain sytems since the problem initally happened. im hoping for some suggestions / network diag advice really to help me locate the cause of this problem. all the clients are windows xp, connecting to a domain controller that is windows 2003 std this server also acts as a DNS server for us. we also have websense 7.0.1 installed on it to filter traffic.

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• IPTables: allow SSH access only, nothing else in or out

  - by Disco

  How do you configure IPTables so that it will only allow SSH in, and allow no other traffic in or out? Any safety precautions anyone can recommend? I have a server that I believe has been migrated away from GoDaddy successfully and I believe is no longer in use. But I want to make sure just because ... you never know. :) Note that this is a virtual dedicated server from GoDaddy... That means no backup and virtually no support.

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• VPN Configuration

  - by Josh

  How can I allow incoming connections on a Windows 7 machine that is connected to VPN? I have some services listening on certain ports that I have forwarded from my router. When the VPN is disconnected, I can connect to these services from my internal network as well as from the Internet without issue. When I connect my VPN however, I am still able to access the ports from my internal network, but not remotely. I think I need a split tunnel setup, and there is an option in the VPN settings to Use Default Gateway on remote network. I want this option enabled so all my traffic is routed through the VPN, but I want incoming connections to be allowed on my internal network IP from the Internet. Is there some hybrid way to set this up with routing?

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• SSD Performance for PHP?

  - by Andrew Fashion

  My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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• Is it possible to cause artificial network packet loss or latency?

  - by nbolton

  I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so I'd like to try and reproduce these conditions on two Hyper-V virtual machines (on the same virtual server). Of course, the network for these virtual machines is "local" so it's actually far from the conditions in a live environment. Is there a program I can run on either virtual machine which will degrade the network performance? Or maybe any other work arounds? For example, one way to reproduce the conditions may be to run the VMs on separate Hyper-V servers in geographically dispersed locations (so the SQL traffic goes over VPN or something) -- but this is a little long winded I think. There must be a simpler way.

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• Proxy - Some general questions

  - by user68802

  Is it possible to accomplish the following scenario with a proxy server? We are having one internet facing server that we want to put behind a proxy for some reasons. We want everything to work as before. When they do a request all connections will be forward to the internal server which will send back the information through the proxy. We want to be able to change to proxy to show an maintenance page whenever we are doing maintenance and change it back to forwarding traffic when we are done. We do also want to be able to keep forwarding all users that are using the sites but show an maintenance page for all new users for a time before showing the maintenance page for everyone in order to give the users some time to finish their work before kicking them out.

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• How does Heartbeat determine when to switch to the secondary? Can you force it to switch?

  - by John

  I've been trying to understand exactly how Heartbeat works - I understand how when one server dies, it switches to the backup. But, for me, it also switches when the primary has a large increase in workload. But, it doesn't always switch at the same value. There doesn't seem to much information on the web about how it works. The best I've found is this article. How does Heartbeat determine when to switch to the secondary, and how does it determine when it switch back to the primary? Is this an editable setting, and can I force it to switch between one and the other? Sometimes when Heartbeat will switch to the secondary, it takes a few days or I've even seen two weeks before it switches back to the primary. This is well after the primary traffic has gone down. I'm currently using BlueOnyx, and my Heartbeat settings are: Auto Failback: on Keepalive: 1 seconds Warntime: 10 seconds Deadtime: 20 seconds Initdead: 30 seconds

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• Is Apache ReverseProxy to Passenger Standalone an acceptable production deployment?

  - by davetron5000

  I have the need to deploy Rails 3 apps, using RVM and gemsets, and am expecting “public” traffic (i.e. this is not an internal-only app). I also must use Apache as the public interface to my app. I understand that Passenger Standalone can help accomplish the rails/RVM end, and I have successfully set it up in my development environment. My question is how viable this setup is for a production deployment. Is deploying via Apache configured to ReverseProxy to my passenger-powered Rails app going to create problems? Since I'm designing the production deployment now, I want to understand if I should spend the additional time to set up Passenger connected to Apache and have that Passenger communicate with Passenger Standalone instance running my Rails app. So, I'm looking for one of I guess three answers: Apache Reverse Proxy to Passenger Standalone will be generally fine You should not use the Apache/Passenger Standalone configuration, but set up Passenger on the Apache side as well Your entire setup is just Wrong, please RTFM (and include link to "FM")

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• send mail via smtp on debian 6?

  - by acidzombie24

  i followed this tutorial http://library.linode.com/email/exim/send-only-mta-debian-6-squeeze?format=print When i got to the end, i sent the email to [email protected]. I didnt receive it. I didnt get spam either, i got nothing. I also didnt get an error message on the console. How do i properly sent up a smtp server and send an email from it? I'll not i am testing this on my VM on my local computer. My ISP doesnt block any traffic whatsoever (which is one reason why i use them) so... what can i do? i also tried this tutorial

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• VPN pre-shared key problems

  - by Owl

  I have two vpns set up on a Symantec Gateway Security 320. VPN 1 goes to a Symantec Firewall/VPN 100 to another clinic of ours and every hour they lose connectivity and the error log on the Firewall/VPN100 shows an invalid pre-shared key error, although, both devices show the same pre-shared key entered. VPN 2 goes to our software vendor to use an additional part of our program. I am unable to ping the remote address and so is the other company, but my VPN status shows it is connected. They have told me the pre-shared key seemed to be automatically trying to resubmit itself as if it were incorrect, about every hour even though it is correct. They also told me port80 traffic was closed but I show the HTTP service using 80 redirected to 80 in my firewall settings. Please help.

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• Issues connecting to a pix 501 via console cable

  - by Bourne

  Have a pix 501 that was set up to do filtering and I was working on setting the vpn up when I lost ssh connectivity. Looking at the front, all 4 lan lights blink intensely green but in a very repetitive pattern. The funny thing is there are only 3 devices connected to the 4 ports so that's the first element that doesn't look right to me. Console cable light doesn't turn on when cable is plugged in and have tried rebooting it many many times to see the bootup sequence with no result. Also, I cannot connect to it via pdm or console but the traffic is permitted through. Are there any additional troubleshooting steps I could do or should I count it as dead? Thank you.

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• Windows 2008 R2 Not resolving IP's or domains

  - by InsaneAR

  I have two servers with Microsoft Windows Server 2008 R2 x64, and today I realized that one of them don't resolve IP's or domain names. If I ping the same machine IP, it respond, but if I ping an external IP (like 8.8.8.8 or any other) it does not work. The same with domain names. At Windows Event Viewer I'm having Warning 1014: Name resolution for the name timed out after none of the configured DNS servers responded THE SERVER HAS CONNECTIVITY, I'm connected remotely and the services and incoming traffic (like FTP, etc) are working OK. Things I've done & tested: Run Kaspersky Virus Removal 10 Restart/Turn off the DNS Client service Clean the hosts file Reboot the server Turn off the Windows Firewall (there's not another firewall) Quit or replace the current DNS servers I just can ping the same machine IP or the gateway! Can anybody help me?

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• EC2 custom topology

  - by Methos

  Is there any way to create a desired topology of EC2 instances? For example, can I create a 3 node topology of nodes A, B, C where C gets the public IP address and B and A are connected to it. Something like: Internet <-- C <-- B <-- A B and A only get private IP addresses and there is no way for the traffic to reach A before hitting B and C. This means I can install whatever I want to install on C and B to filter, cache etc. I'm going through EC2 documentation but so far I have not seen anything that talks about it. I will really appreciate if anyone knows how to do this on EC2

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• Iptables: masquarading and routing

  - by nixnotwin

  I have a WAN router which is linked to isp over a /30 WAN subnet. But it also servers as a router to a /29 local public WAN subnet which is connected to few of my servers. The traffic from /29 gets routed to ISP via /30 subnet. For a wired reason I want to masqarade (NAT) the interface which has /30 ip. So the interface with /30 ip should appear as masquaraded for my 192.168.1.0/24 network and it also should act as a normal non-NAT router for my WAN public subnet /29. Can this be done with iptables on a Linux machine?

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• iptables block everything except http

  - by arminb

  I'm trying to configure my iptables to block any network traffic except HTTP: iptables -P INPUT DROP #set policy of INPUT to DROP iptables -P OUTPUT DROP #set policy of OUTPUT to DROP iptables -A INPUT -p tcp --sport 80 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT The iptables output (iptables -L -v) gives me: Chain INPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 4 745 ACCEPT tcp -- any any anywhere anywhere tcp spt:http state RELATED,ESTABLISHED Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 2 330 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http state NEW,ESTABLISHED When I try to wget 127.0.0.1 (yes i do have a web server and it works fine) i get: --2012-11-14 16:29:01-- http://127.0.0.1/ Connecting to 127.0.0.1:80... The request never finishes. What am I doing wrong? I'm setting iptables to DROP everything by default and add a rule to ACCEPT HTTP.

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