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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Having XP VM use my host OSX ssh tunnel to connect to a remote site?

  - by Manachi

  I am using Mac OSX and have Windows XP running on VMWare Fusion. I'm creating an ssh tunnel from OSX to a remote server, and then trying to have Windows XP use that tunnel (I actually use a program called Proxifier on XP to filter my XP MS SQL Server traffic through that tunnel) Note that I can successfully create an ssh tunnel (on port 9333) from the XP putty to the remote host, and have SQL Server Proxify through that tunnel and it all works correctly. However when I try to set up the tunnel in OSX, and have Proxifier in XP point to the OSX tunnel instead of localhost, it doesn't seem to connect. Here is the OSX command i'm using to create the tunnel: ssh -i /my/key -p 9001 -D 9333 -g me@remotehostname Then I set my XP proxifier to point to macosxhostname:9333 (instead of the previous localhost:9333 which worked corrently when using putty) Any suggestions on what I may have missed? My XP firewall is turned off while setting this up.

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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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• Cookies blocked by router?

  - by Martin wiboe

  Hello, My friend has a D-Link DI-524 router that she uses for her home broadband. It's a pretty vanilla setup with the standard firewall settings, DHCP enabled etc. However, recently she has experienced something strange - cookies are not working on every computer on her LAN, whether using FF3.5 or IE8. I tried viewing the HTTP traffic using Fiddler2, and the requests come through fine (mind you, Internet browsing still works flawlessly) but whenever a website tries to set a cookie using the "Set-Cookie:" header, my computer sees that line as "Set-*ookie:" with the cookie contents removed. I have never seen anything like this - do you have any idea? Regards, Martin

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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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• Windows 2008 server hosting in Europe

  - by Lasse P

  Hi, I'm searching for a Windows 2008 server in Europe, preferably in Germany or UK or anything with good routing to Denmark (as its where the primary traffic will be generated from). The server will be used as web server (asp.net mvc, php), mail server and database server. We are running a few sites with around 200 concurrent users, which isn't much, but we intend to expand in the near future and the server should be easy to scale in form of adding more RAM and HDD space - if its possible. I think a virtual server may be the best choice - hyper-v or virtuozzo? - considering cost vs specs - but i'm open to suggestions. The max budget is in the range of $1000-1200/year. You guys have any suggestions? Let me know if you need further info.

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• Socksify TCP connections reaching a gateway IP -- preferably without iptables

  - by Alexandra Neagu

  I have Virtualbox installed on Debian with a few virtual machines. I can't install anything in the guests, and I use host only networking, vboxnet0. The host IP in the host network is 192.168.56.1, and the guests have static IPs in 192.168.56.0/24. I access Internet with a SOCKS proxy (without authentication) and I would like the Virtualbox guests TCP connections to be sent through the SOCKS proxy. This would also be useful for socksifying external TCP reaching a gateway network card or wireless access point. I looked at transocks, tun2socks, with dante-client, etc., but I don't know how can I achieve this without enabling IP forwarding in the host and using iptables. Maybe to attach somehow the Virtualbox vboxnet0 network to the tunnel tun0 used by tun2socks? Or maybe there is a way to do NAT to tun0 in Virtualbox? I only need TCP traffic and I don't need UDP, not even for DNS.

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• Security log overflowing with filtering blocks

  - by Jacob

  I have a Windows 7 workstation whose security log is overflowing with the following errors: Audit Failure 3/31/2010 2:00:50 PM Microsoft-Windows-Security-Auditing 5157 Filtering Platform Connection "The Windows Filtering Platform has blocked a connection." Audit Failure 3/31/2010 2:00:50 PM Microsoft-Windows-Security-Auditing 5152 Filtering Platform Packet Drop "The Windows Filtering Platform has blocked a packet." These are not unexpected events; the firewall is expected to drop unsolicited traffic. However, I can't figure out how to tell Windows to stop writing these events to the security log. I've seen this problem before and have been able to find an answer with the use of Google, but I wasn't able to locate on this this time. Thanks!

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