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• Using airport extreme base station as a wireless G to wireless N bridge

  - by micmcg

  Due to unfortunate placement of various wall outlets in my new apartment, my adsl 2 modem + router is not able to be placed next to my airport extreme base station (AEBS). I'd prefer not to run cat5 cable between them, but I still want to use the wireless N on the AEBS, because it will have a high speed NAS plugged in via gigabit ethernet so I want to maximise the wireless transfer speed to my 27" iMac. Is it possible to use one of the radios in the airport extreme to bridge the wireless G network with the router, and the wireless N radio to broadcast normally? The only traffic going over the G network should be internet (24mbps ADSL2) so it should never get saturated. Thanks

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• How difficult is it to setup Mac OS X Server?

  - by Anriëtte Combrink

  Hi there We are a small office of about 4 people, and we would like to have a 27-inch iMac (Core 2 Duo) setup as a server and workstation simultaneously, using Mac OS X Server. This might seem like overkill (and stupidity at the same time), but here is the situation: we want to convert our whole office to Mac, only one full-time PC left we will not use it's mail server we might use it's chat server we want it setup to provide VPN we are a small office so I don't see how the server can be overrun with too much traffic. How difficult would it be to set it up in this way? I have a fairly advanced knowledge of Mac OS X but have never encountered Mac OS X Server. I think I would be able to set it up, but what are the probable pitfalls that might come up? Has anyone else been in a similar situation?

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• email handling with inbox.py and nginx

  - by Matt Ball

  I have a Flask web application running behind gunicorn and Nginx. Nginx proxies any traffic to ivrhub.org to the correct flask app. I would very much like to use inbox.py to process some incoming email. Running inbox.py's example on my server and then sending an email to [email protected] does not work as I intended. The inbox.py server does not seem to receive anything but the email also does not bounce. I'm missing something conceptually -- is there a DNS setting I need to configure or something I need to adjust with Nginx?

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• Incredibly high latency for Ubuntu guest on Hyper-V

  - by Mark Henderson

  I've got several Ubuntu 10.04 virtual machines running as Hyper-V guests on Windows Server 2008 R2 SP1 and they're all perfectly fine. Today I installed my first Ubuntu 11.10 virtual machine and I'm seeing rediculous pings: These servers are all connected via gigabit to a local LAN, with almost no network traffic at all1, with a legacy network adapter in Hyper-V. I'm a bit of an Ubuntu n00b so I don't really know where to go from here. Any ideas? free -m reports: total used free shared buffers cached Mem: 485 470 15 0 63 299 -/+ buffers/cache: 107 378 Swap: 507 20 487 This is within a few mb of our other Ubuntu servers that are on 10.04. I removed the Legacy NIC and installed a Synthetic one in Hyper-V and this did improve the numbers, in that they're around 10-30ms now, but I would still be expecting <1ms response times. 1As a comparison, I have another Ubuntu 10.04 guest on Hyper-V almost 1,000km away that has a ping of 33ms

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• Media Temple-like hosting services?

  - by antonpug

  I have a couple of wordpress sites which do not get much traffic now, but I plan on expanding to something like a 1000-2000visits/day in a year or two. Media Temple has some really nice offerings, but their Wordpress plan is 20/month...which is a little too much, seeing as at this point my site is more of a hobby than a money making machine. I currently host with HostGator (just switched from GodaddyiPageBluehost). All these cheaper/pop hosting services are okay, but it would be nice to find something a little bit more "premium", but at a lower cost than MT. Anyone know anything worth looking at?

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• pfsense multi-site VPN VOIP deployment

  - by sysconfig

  have main office pfsense firewall configured like this: local networks WAN - internet LAN - local network VOIP - IP phones need to connect remote offices (multi-users) and single remote users (from home) use IPSEC or OpenVPN to build "permanent" automatically connecting tunnels from remote location to main location. in remote locations, network will look like this: WAN - internet LAN - local network multiple users VOIP - multiple IP phones in order for the IP phones to work they have to be able to "see" the VOIP network and the VOIP server back at the main office for single remote users ( like from home ) the setup will be similar but only one phone and one computer so questions: best way to tie networks together? IPSEC or OpenVPN can this be setup to automatically connect ? any issues/suggestions with that design/topology ? QoS or issues with running the VOIP traffic over a VPN throughput, quality etc.. obviously depends on remote locations connection to some degree

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• Will being a VPN Client interrupt web pages hosted by IIS?

  - by f1gm3nt3d

  We have a dedicated server that is primarily used to host our website. I've been tasked with determining the feasibility of setting up a VPN connection from it to our Internal Network at our offices for a few ease of use purposes. My concern is that if I establish this VPN connection our Website will only be available internally and not to the internet in general. I'm concerned about this because in everything I read the fact is stated that by default all network traffic is routed over the VPN connection when it's established, is this also true for applications such as IIS that are listening for incoming connections? TL;DR Will having a VPN Client up and running cause a problem with server applications that may be listening on the NIC connected to the Internet due to changes that VPN makes in the routing tables?

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• Windows 2008R2 blocks outbound LDAP for non-admins?

  - by Jon Bailey

  I've got a Windows 2008R2 terminal server with ~30 users on it. It's joined to a Samba-based domain. During the login script, we connect directly to the LDAP server to pull out certain profile information. This used to work just fine. Now, it doesn't, but only for non-local-admin accounts. Local admins work fine. As a non-local-admin: Connection to ports 389 or 636 just terminate (wireshark on the LDAP server reveals no connection attempt) Connection to other ports on the same server work fine Same thing on multiple LDAP servers Windows firewall is disabled Can't find any other rules/policies that may block this I suspect since this used to work, it came down during an update, but for the life of me, I can't find what. EDIT: I just ran Wireshark on the machine and didn't see anything when connecting to the LDAP server in question (or any LDAP server for that matter). I can, however, see traffic when I connect to that server on another port.

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Small web server hardware advice

  - by Dmitri

  We need to build a new web server for our organization. We have around 100 hundred small traffic web sites, so our hardware requirements are not too tough. We run CentOS 6, Varnish+Apache, PHP, MySQL, Typo3 CMS for most of websites. Here's a hardware we want to buy: SuperMicro X9SCA-F-O (we need to have a remote management capability) (or better X9SCM-F?) Intel Xeon E3-1220 v2 2*4Gb DDR-III 1600MHz Kingston ECC (KVR16E11/4) (currently we have 4gb, and it feels like enough, so no reason for 16gb yet). Procase EB140-B-0 (1 unit) PSU 350W Procase MG1350, Active PFC We already have: Intel 335 120GB SSD (for OS, databases and important websites). 2*2tb WD Green RAID1 (for other data and backups). Does it look like a reasonable choice for our needs? Any issues with hardware compatibility? Any other notes?

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• High server load - [jbd2/md1-8] using 99.99% IO

  - by Alex

  I've been having spike in load over the last week. This usually occurs once or twice a day. I've managed to identify from iotop that [jbd2/md1-8] is using 99.99 % IO. During the high load times there is no high traffic to the server. Server specs are: AMD Opteron 8 core 16 GB RAM 2x2.000 GB 7.200 RPM HDD Software Raid 1 Cloudlinux + Cpanel Mysql is properly tuned Apart from the spikes, the load usually is around 0.80 at most. I've searched around but can't find what [jbd2/md1-8] does exactly. Has anyone had this problem or does anyone know a possible solution? Thank you. UPDATE: TIME TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 16:05:36 399 be/3 root 0.00 B/s 38.76 K/s 0.00 % 99.99 % [jbd2/md1-8]

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• How to restrict Apache Location directive to cetain sub-domain?

  - by ohho

  On our server www.example.com, we use the <Location> directive to proxy traffic to a back-end server: <Location /app1> ProxyPass http://192.168.1.20 </Location> Then we added a sub-domain uat.example.com which points to the same IP address of www.example.com. We want to use it as a proxy for client to test an app being developed. Hopefully, the client can access via: http:/uat.example.com/app2_uat Now if we add a Location: <Location /app2_uat> ProxyPass http://192.168.1.30 </Location> The client can access both: http:/www.example.com/app2_uat http:/uat.example.com/app2_uat How can I restrict Location such that only: http:/uat.example.com/app2_uat is accessible? (i.e. http:/www.example.com/app2_uat should not be accessible.)

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• Rsyslog mail module not working

  - by Henry-Nicolas Tourneur

  Hi *, I would like to email snort alerts from my Debian Lenny fw. Syslog is sending log messages from the firewalls to a central rsyslog. On my central rsyslog, I got something like : $ModLoad ommail $ActionMailSMTPServer server.company.local $ActionMailFrom [email protected] $ActionMailTo [email protected] $ActionExecOnlyOnceEveryInterval 1 $template mailSubject,"[SNORT] Alert from %hostname%" $template mailBody,"Snort message\r\nmsg='%msg%'" $ActionMailSubject mailSubject if $msg regexp 'snort[[0-9]]: [[0-9]:[0-9]:[0-9]].*' then ommail:;mailBody But I doesn't get any mails, I even can trigger snort with something like ping -s 1400, it logs things like following but still no mail ! 2010-01-08T09:25:58+00:00 Hostname snort[4429]: [1:499:4] ICMP Large ICMP Packet [Classification: Potentially Bad Traffic] [Priority: 2]: {ICMP} ip_dest - ip_src Any idea ?

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• What is a usable throughput for a home media server

  - by Craig

  I am looking to setup a home server that will act as a media server. This will include both video (possibly HD) and audio. The clients will be a fun mix of hardware but that is a different question. What I want to know is what is the minimum throughput for streaming video without hitches? Is there a "sweet" spot for throughput (price vs. throughput)? I am determining my budget for this "upgrade" and I need to evaluate wether or not upgrading to a 1 Gbps home LAN is required. Sure, it would be sweet and easily handle the traffic but I don't want to do it unless it is necesary.

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• Mysqldump causes "Too many connections"

  - by vbachev

  A scheduled backup using mysqldump on one of our databases is causing Too many connections. The database is of both InnoDB and MyISAM tables with size of around 500Mb. The Too many connections appears for about 2-3 minutes We understand that mysqldump locks the tables and causes all other queries and connections to pile up and jam the mysql server. We need frequent backups and we cannot afford server downtime or putting websites in maintenance mode while doing it. Our websites are global and traffic is high all the time so its hard to find a moment for backups. How can we avoid downtime during backups?Is there maybe a way to use mysqldump in way that it will not lock all tables at the same time?Is there an alternative to backing up with mysqldump?

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• Using the option port on my Watchguard Firebox as a 2nd gateway exit point?

  - by Donovan

  I'm working on a network project in witch I have to design our network to provide two different exit points. The points are differentiated by the path through the corporate network. One of them travels through some monitoring hardware the other does not. We have a Watchguard Firebox in use as our gateway. Currently the network side provides the unmonitored exit point. I was wondering if i hooked the option port to our lan at a point that would force traffic through the monitored path, would it cause any problems? Access to the unmonitored gateway port would be restricted by ip. That would force all others not authorized to point to the monitored gateway port. I thought with the above design i might be able to get away with not having to buy another firebox to achieve the design I want. Thanks, D

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• what firefall linux distro applicance could track internet usage per device in my home?

  - by GregH

  Hello, Anyone know of a community edition/open source/free firewall/gateway software product that I could install onto an old PC to act as my firewall/gateway/proxy etc, BUT for which it has the power to track internet usage per device in my home. So: a) Mandatory - Track internet usage for devices on my home network on a per device basis (e.g. various PCs/Xbox etc) b) Mandatory - Report/graph would would give a breakdown of internet usage, per device (e.g. IP address), per day. c) Desirable - as in b) above but per hour d) Desirable - realtime graph (e.g. 5 minute measurement intervals or something) that shows current internet usage per device e) Mandatory - Handles all internal<=internet requests for all protocols (e.g. HTTP, HTTPS, xbox etc) f) Mandatory - No explicit settings in clients required - i.e. Transparent Monitoring concept (for both HTTP and non-HTTP traffic like xbox, skype etc) g) Mandatory - easy "appliance" like installation onto a dedicated low spec PC thanks in advance

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• what firefall linux distro applicance could track internet usage per device in my home?

  - by GregH

  Hello, Anyone know of a community edition/open source/free firewall/gateway software product that I could install onto an old PC to act as my firewall/gateway/proxy etc, BUT for which it has the power to track internet usage per device in my home. So: a) Mandatory - Track internet usage for devices on my home network on a per device basis (e.g. various PCs/Xbox etc) b) Mandatory - Report/graph would would give a breakdown of internet usage, per device (e.g. IP address), per day. c) Desirable - as in b) above but per hour d) Desirable - realtime graph (e.g. 5 minute measurement intervals or something) that shows current internet usage per device e) Mandatory - Handles all internal<=internet requests for all protocols (e.g. HTTP, HTTPS, xbox etc) f) Mandatory - No explicit settings in clients required - i.e. Transparent Monitoring concept (for both HTTP and non-HTTP traffic like xbox, skype etc) g) Mandatory - easy "appliance" like installation onto a dedicated low spec PC thanks in advance

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• OpenVPN Cloud for Network monitoring

  - by mezgani

  I'm working on a supervision project based on OpenVPN, a good way to send some network traffic through a secure channel to office from there out to the Internet. On office i have an OpenVPN server installed and i need to monitor all branches servers that are behind firewalls. I know that the point to point solution is very easy so we may only install OpenVPN client on node that i need to monitor. In the fact, is there any other issue that could help to supervise all branches DMZ network, without installing the client on each machines.

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• Server with 3 public IP and iptables

  - by Juan

  I have a linux box with two NIC cards: eth0 and eth1. In one card i have 3 public IP: eth0 = 10.10.10.1, eth0:1= 10.10.10.2 and eth0:2= 10.10.10.3 In the other card i have one local IP eth1 = 192.9.200.1 I want to redirect all the wan traffic for 10.10.10.2 to the LAN 192.9.200.2 and the same for 10.10.10.3 to 192.9.200.3 I have tried with this rule but doesn't work iptables -t nat -A PREROUTING -i eth0 -d 10.10.10.2 -j DNAT --to-destination 192.9.200.2 iptables -t nat -A PREROUTING -i eth0 -d 10.10.10.3 -j DNAT --to-destination 192.9.200.3 IP forward is enabled in /etc/sysctl.conf Can you help me, please.

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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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• 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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• MSSQL instance shuts down

  - by citronas

  I'm currently developing a new ASP.net project hosted on a Windows Server 2008 RC2 with an MSSQL 2008 Express Database. I have three SQL instances (for different purposes) running which currently all contain a single database. For apprently no reason, these instances tend to shut down after some days, for no apparent reason. There might be low or none traffic to these instances, because there might be some days in a row, where I can't develop. It now occured several times, that one or two of these three instances just shut down, so that I can't access the database, without manually starting the instance. I can't seem to find a event log entry for the shutdown, which is most likely because I just enabled logging (why is the default setting off?) So the questions are: * Why does a SQL instance shut down? (Is there such thing as a "Shut down instance after 3 days of inactivity"? * How can I achieve that the instances are running 24/7?

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• Memcached server: Is it a good practice to point two server urls to the same server?

  - by Niro

  I have a system where there are connections to a memcache server from several different files and servers. I would like to stay with one server but keep the option of increasing the number of memcache servers (for periods of of high traffic). My idea is to tell memcache there are two servers, while the two urls will point (by DNS) to a single server. In the future if I want I can add a server and change DNS without changing the code in many places. Is this a good practice? Is there a performance cost to the fact that there are two server connections but they both point to the same server? Any other idea how to achive instant expeandability of memcache capacity without need to change the code and deploy ?

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• VPN Split Tunneling - Pros and Cons and how to achieve?

  - by Theveloper

  Well this is the dilemma, I want remote clients to connect to my network and only route local access through the VPN. This is split tunneling, the client uses its internet connection for all other internet requests and the VPN tunnel to my network for local requests. There's a couple of issues that arise: split tunneling in Windows is achieved by unticking an option which reads "Use default gateway on remote network" in the TCP/IP settings of the client VPN connection. At any point the user can tick it and route all his internet traffic through my network eating away at my bandwidth and being cloaked by my IP address. This is unacceptable. Issue number 2 is that if the client is split tunneling, he becomes a gateway between the internet and my network, this is also unacceptable. My questions are: how does one achieve split tunneling serverside? And is the latter issue a valid con worthy of worry? Any thoughts would be appreciated!

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