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• Wireless Bridge -DHCP

  - by Usta

  I was thinking of picking up a couple of TP-Link wireless routers, and setting them to bridge. I have a sep. LAN network that would have one of them, and I'd put one on my internet connection. Would I be able to keep my current IP subnets? (255.255.255.0 and 255.0.0.0) or would I have to pull my IPs from the same IP range. (I want to keep my current DHCP servers in place) The reason I want a bridge is so that I can VPN into the internal network.

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• When should .local be used?

  - by hydroparadise

  So, I've set up a few Win Servs in my time and always did the .local thing when there was a router that sepearated my internal from external networks. Now that I'm setting up an *nix box for the first time, does this concept still apply? Do I still want my FQDNs (/etc/hostname) to show .local or .com for all my machines (mixed: linux servers, win workstations) inside of my network. This question comes in context of always having Active Directory hold my hand every step of the way, where now I'm setting up an DNS machine manually.

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• Possible to redirect from HTTPS to HTTP behind load-balancer?

  - by Derek Hunziker

  I have a basic ASP.NET application that sits behind an F5 load-balancer. Incoming SSL requests (over HTTPS) terminate at the load-balancer and all internal communication between the load-balancer and my application servers is unsecure (over HTTP). When a unsecure request comes in, my app is able to use Response.Redirect("https://...") to redirect a secure URL with no problems. However, the other direction appears to be impossible - I cannot redirect from HTTPS to HTTP using Response.Redirect() from my application. The URL remains HTTPS for the client and does not change. Could the F5 be preventing the redirect for ever reaching the client? Is there any special configuration necessary to let this happen?

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• How to manage SOAP requests to a pool of VM each listening on a HTTP port with a priority value in these requests?

  - by sputnick

  I have a front SOAP web-server under Linux. It will have to communicate with Windows Servers VM listening each on a HTTP port, for a HTTP POST request. The chosen VM should return a report of the task to the SOAP client. In the SOAP requests, there's a special variable : the priority of the request (kind of SLA), and my question is coming right now : I think of using a ha software (nginx, HAProxy, HeartBeat...) that can manage priority in this point of view. Is it relevant or do you think I need to implement a queue by myself with some specific developments? Ex: I have a SOAP requests with low priority in the pipe : the weight priority for these VM should be decreased if I have high priority SOAP requests at the same time. Any clue will be really appreciated.

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• How can we implement network search for Windows AND OS X clients?

  - by michielvoo

  We have a network with Windows 7 and OS X (10.5 and 10.6) computers. Our servers run on Windows Server 2003 (1 Small Business Server, 2 Standard). We need to be able to search through about 15.000 - 30.000 documents in our archives. The best solution would be if users can search directly from the Windows menu (on Windows 7) or the Spotlight menu (on OS X 10.5 and 10.6). Also good would be if users can search directly from the search bar in their browsers, or by first visiting a site with the search form. In case the users search through the browser, it's important they they are able to open a file in the search results just by clicking on it. I have tested Microsoft Search Server Express, but it doesn't meet the requirements (no OS X support, results in the browser can't be opened by clicking in anything but Internet Explorer). I have looked at Spotlight server, but that only supports OS X. Thanks!

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• Domain name in server other than the website

  - by med

  Hello! I'm not very popular with hosting, but I have a special situation: I live in Tunisia, I can buy a domain name with .tn extention, but the problem is that: 1- The domain could not be pointed to a server outside Tunisia 2- All servers in Tunisia are bad, no one provides really reliable hosting so, I want to use the .tn domain with a basic hosting in Tunisia, and Make other db queries and rich media on another remote server outside Tunisia. How to do it? Is there better alternatives? All suggestions are welcome :) Thank you.

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• My Laptop (HP/Compaq 2510p) running ubuntu 10.04 LTS keeps losing the WLAN connection.

  - by Ernelli

  I am using Wicd and can successfully connect to my ADSL router (Thomson TG 787) using WPA PSK. But with regular interval I lose the ability to connect to Internet. I can ping the GW and can actually ping servers on the Internet but not connect to them using HTTP (Tested with both Firefox and wget). I would suspect the router unless for the fact that the problem does not show up when running Windows XP on the same computer and also, when the problem arises, a simple disconnect/connect in Wicd solves the problem, which does not involve the router (Except for the DHCP request). I have searched Ubuntu forums without luck, most problems described relate to specific network drivers or other problems. Does anyone have the same experience with Linux/Ubuntu and WLAN?

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• Sharing / replicating EBS across AWS nodes

  - by skrat

  I would like to use single EBS storage across multiple EC2 nodes (web/app servers). I've read some articles on snapshot sharing, but that doesn't suit well for what we need. We use filesystem for storing DB record attachments, so if one such attachment gets created, we need it to be immediately available to all nodes (to serve). So far only NFS seem to be viable, but it's a pain to configure and maintain. Another option could be storing those attachments on S3 instead, but that would cut us of doing any analysis on that data. This must be quite common problem when scaling in AWS, what solutions are there?

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• Is it necessary to have firewalls rules between trusted nodes communicating on their backend interfaces?

  - by Tom

  I have 6 nodes that have internet access on eth1 and private access to one another on eth0. Currently I have firewall rules for eth0, for things like memcached and NFS. Is this necessary? It's a real headache as NFS for example communicates on loads of different ports, and I recently introduced glusterfs which needs more still. Is the headache of figuring out what backend ports to unblock worth the security enhancement? I should mention that I will of course still have a firewall rule on eth0 to block servers owned by others in the same datacenter. Thanks

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• Redirect traffic to local address so iOS speedtest app measures LAN speed

  - by ivan_sig

  I have mounted a Speedtest Mini server on a local LAMP, so I can test my LAN speeds effortlessly just by opening the URL with a Flash enabled web browser, the thing is, I want my iOS and Android devices to test with the LAN server too, not with the WAN, as I'm trying to measure LAN-Only performance. Is there a way so I can redirect the traffic intended to an specific external IP (The one of the real server) to my local server?. I know the servers IP as a short Wireshark analysis gave me the data, but still searching for a way to make that redirect. I have Jailbreak and root on my devices, so playing with system files is not a problem. I've tried mounting a proxy and making redirects by the hosts file and domain names, but it looks like Ookla's app relies on IP address only.

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• What would cause SQL 2008 Log Reader Agent to fail with "This process could not execute 'sp_replcmds

  - by Rick

  I've seen this error message in other posts. They didn't seem to help resolving our issue. We are trying this with two SQL Server 2008 servers. I backed up my database from the source server and then restored it on our destination server. We setup basic Transaction Replication. The Snapshot Agent is working fine. The Log Reader Agent fails with the error above. Is it most likely a login issue for this job or QueryTimeout?

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• just another apache to nginx rewrite question

  - by Brandon

  I have the following Apache rewrite directives: RewriteCond %{REQUEST_URI} ^/proxy(/|$) [NC] RewriteCond %{QUERY_STRING} (^|&)uri=(.*?)(&|$) [NC] RewriteRule .* /api/vs1.0/%2 [NC,L] And I'm trying out nginx, so trying to move the rewrites over. I came up with... rewrite ^/proxy(/|$) /api/vs1.0/$2 last; rewrite (^|&)uri=(.*?)(&|$) /api/vs1.0/$2 last; Which is probably grossly incorrect. I'm just a mere web developer, so I was wondering if anyone could lend a hand here. I would be much obliged. I see that I am ignoring the query string specification, but I'm thinking that it shouldn't matter. I only have a vague idea of what the original rewrite is accomplishing, so I haven't much hope here in coming up with something decent, despite reading the relevant documentation for both servers.

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• How can we implement network search for Windows AND OS X clients?

  - by michielvoo

  We have a network with Windows 7 and OS X (10.5 and 10.6) computers. Our servers run on Windows Server 2003 (1 Small Business Server, 2 Standard). We need to be able to search through about 15.000 - 30.000 documents in our archives. The best solution would be if users can search directly from the Windows menu (on Windows 7) or the Spotlight menu (on OS X 10.5 and 10.6). Also good would be if users can search directly from the search bar in their browsers, or by first visiting a site with the search form. In case the users search through the browser, it's important they they are able to open a file in the search results just by clicking on it. I have tested Microsoft Search Server Express, but it doesn't meet the requirements (no OS X support, results in the browser can't be opened by clicking in anything but Internet Explorer). I have looked at Spotlight server, but that only supports OS X. Thanks!

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• Are changes to the date and time logged in Windows Server?

  - by user17605

  We've recently gone into British Summer Time in the UK. One of our techs, anticipating the move, decided to change the time on one of our servers. Bad move. This server happens to have a number of time-based incidents logged to it, and as a result of this change, the times are unreliable. I'm trying to build a concrete timeline of when the clock was changed so I can apply corrective action to our time-based records. My question is:- Does Windows record date and time changes anywhere so I can get hard, actual data? Thanks

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• Domain account credentials fails to start scheduled tasks

  - by neoco

  I have 2 Windows 2000 servers in a domain 'DC', which run numerous windows scheduled tasks under the 'DC\Task-User' account. These tasks are and have been running successfully in the past couple of years without any account/password modifications. Yesterday, the tasks went to 'Could not start' status. Myself having an admin account, was able to run these tasks with my credentials. Today, I ran the tasks again under the DC\Task-User account and they seem to be running fine without any issues. This has happened in the past too. I'm not into networking so don't know much about the underlying problem. Has this something to do with a Domain controller account authentication? Any pointers will be great!

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• OpenVPN on port 53

  - by TossUser

  I have an openvpn server setup on UDP port 53 on a public IP. All the connecting clients gets pushed external DNS servers such as 8.8.8.8 and opendns. Sometimes the resolution stops working on the connected vpn clients and I get strange packets in the openvpn log. Now my question is why is that? When a VPN client, let's say 192.168.1.22 does a DNS query that query should go to 8.8.8.8:53 and then an UDP response packet should be sent back to 192.168.1.22 on a high UDP port. Any ideas? Thanks

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• Sending a mail to gmail from my local mail server

  - by tambia

  I just configured a mail server and tried sending a mail to my gmail account with a local email I created with my mail servers dns. I didn't go well. I use redhat server and sendmail and the testing was done with evolution mail. I had the following error : "RCPT TO<[email protected]> failed: <[email protected]>... relaying temporarily denied. Cannot resolve PTR for my ip" How can I solve this?

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• Safety concerns on allowing connections to MySQL with no password on localhost?

  - by ÉricO

  In the case of a Linux system, is there any security concern to let MySQL users with standard privileges (that is, not the root users) connect to the database with no password from localhost? I think that enforcing a password even for localhost can add a layer of protection, since, with no password the database access would be compromised if the SSH access is itself compromised. Considering that, would it be less safe to allow no password connection to MySQL than having the same password for SSH and for MySQL? I don't know if that is to be taken into account, but we also use phpMyAdmin to let users administrate their own database. I am asking because I kinda dislike having to put our database passwords unencrypted in the source or configuration files of our applications, where they can easily be leaked unintentionally. Since our servers are configured to run our applications as the Linux user the application belongs to, I was considering allowing no password from localhost as a simple solution. So, would that be a very bad idea or not?

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• Can NFS be forced to refresh stale files/directories when not using noac on the mount?

  - by johnnycrash

  We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a function I can call from c to refresh the attributes of a path and all its files. EDIT: I should add we cannot mount and unmount since there are 16 servers running on each system and they are constantly accessing the files. Well...maybe we could mount and unmount if each server used their own mount. I'd like to avoid that if possible. thanks!

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• backup, sync and search files over internet and intranet

  - by Cawas

  There are many online backup options out there. Dropbox, Sugarsync, Mozy, Carbonite, Jungledisk and my favorite so far, Crashplan. Some of them allow searching, all of them sync with their online servers, none of those (or many many others I didn't listed here) have what I want. I'm _not_ looking for an online backup service in here. Sure, some people might say "use rsync", "linux" and/or "set up apache" and so on... But that's just too much for maintenance, if it's even viable of building up. It needs to be simple. So, anyone knows of a really good solution out there? Picture mostly Google Desktop Search (or quick search) awesome searching, mixed with Crashplan Desktop, which is able to do everything by itself, and something like Dropbox's file versioning, along with dropbox the ability to seamless sync over intranet and internet like crashplan, switching between them when needed. I bet there's nothing like this yet, but well, I'm not sure. It would be great!

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• Can't browse computer via nlb cluster name

  - by peg_leg

  I have a fileserver nlb cluster, currently set to single affinity, made up of 2 2008R2 servers. We switched the primary node today. Now our Windows XP workstations can't browse to the cluster name (i.e. \fileserver) but can browse to the cluster ip address (i.e. \192.168.1.1) and can browse the member server by name (i.e. \filesvr1). I remember having a similar issue when we had to change a registry setting to allow Windows XP boxes to see another file server that was in a failover cluster but had to be referred to by another name (\thisfileserver instead of \fileserver). Convoluted, for sure, but it helped to prevent any code changes from happening. Well all of the programmers have their code on \fileserver and we can't have them switch their links every time \filesvr1 supercedes \filesvr2 or vice versa. I can't remember that registry setting that allowed the file server to ignore that it's being called by the wrong name. HELP!

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• Tcp window size won't go above 130048

  - by Roger

  I have 2 servers set up with about 80ms latency between them. Both are centos 6 and run a java app that transfers data from on location to another. Both are on 1gbps connections. I have been trying different sysctl settings and different send & receive buffer settings in java but no matter what I set them to, I cannot get the tcp window size to go above 130048 in the tcp dumps. This equates to roughly 13mbps which is the actual throughput I am getting.

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• VPN Router + LDAP/RADIUS?

  - by MrZ

  Hello all! I need a VPN-capable router, preferably with a web interface, that should be able to authenticate against my LDAP server which is behind the router. The problem stems from the fact that I'm utterly unable to configure that setup for the Linksys RVS4000 that I own. Anything exists that is both cheap and easy to setup? Flashing the firmware is an option, as long as it is a well-documented option. Would it be viable/doable? [Edit] Okay, I've been looking at custom firmwares, any way to know which ones will work with my router before nuking its present one to oblivion? Anyone has experimented with that? My needs are quite simple, I want a DHCP router, an LDAP authenticated VPN, and basic firewall capabilities. I'm using DynDNS from the RVS4000 for now, but I guess I could setup something on the servers instead, that's only a minor problem...

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• How large administrators team should be? [closed]

  - by Artyom

  I'm trying to find an answer about how many server administrators/technicians are required to run a server farm with 7/24 availability of let's 10, 100, 1000 Linux servers? Are there any studies for this? Edit I was not expected this question to be closed. There are lots of studies about for example software development where from "lines of code" you can approximate the software development cost (COCOMO), so I was searching for something similar in administration. Note, I'm 100% understand that it is not a straightforward or easy to answer question, but it is a real question...

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• Fresh Apache install can't be connected to

  - by Wayne M

  I've got to be missing something here. I have a brand new CentOS server with a LAMP install on it. My domain host (GoDaddy) has the server's IP address configured as the "A Record". Since the server will host subdomains I have enabled NameVirtualHost and set up a virtual host pointing to the web app on the server. I haven't touched anything else in Apache, and it's listening on Port 80 like it should be. However, I can't connect to the server either by DNS or by IP address. I've set up several servers exactly like this one and never run into this before. What could be causing this? Did someone on the host set up a firewall or something that blocks port 80? As I said, I can't connect to the server via anything, but it's a barebones box with LAMP installed on it.

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