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• Easiest way to allow direct HTTPS connection in Intercept mode?

  - by Nicolo

  I know the SSL issue has been beaten to death I'm using DNS redirect to force my clients to use my intercept proxy. As we all know, intercepting HTTPS connection is not possible unless I provide a fake certificate. What I want to achieve here is to allow all HTTPS requests connect directly to the source server, thus bypassing Squid: HTTP connection Proxy by Squid HTTPS connection Bypass Squid and connect directly I spent the past few days goolging and trying different methods but none worked so far. I read about SSL tunneling using the CONNECT method but couldn't find any more information on it. I tried a similar method in using RINETD to forward all traffic going through port 443 of my Squid back to the original IP of www.pandora.com. Unfortunately, I did not realize all other HTTPS requests are also forwarded to the IP of www.pandora.com. For example, https://www.gmail.com also takes me to https://www.pandora.com Since I'm running the Intercept mode, the forwarding needs to be dynamic and match each HTTPS domain name with proper original IP. Can this be done in Squid or iptables? Lastly, I'm directing traffic to my Squid server using DNS zone redirect. For example, a client requests www.google.com, my DNS server directs that request to my Squid IP, then my transparent Squid will proxy that request. Will this set up affect what I'm trying to achieve? I tried many methods but couldn't get it to work. Any takes on how to do this?

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• Ubuntu server crashes; need help figuring how to figure out why

  - by neezer

  I have a 768 Slice at slicehost.com running Ubuntu Server 8.04.2 LTS (hardy) with a LAMP stack on it that periodically crashes, though why I am not sure. From what I can tell, there is a process that basically goes rogue and consumes all the memory on the slice, suffocating all the other programs running until the whole thing comes to a grinding halt, and I have to do a hard reboot of the slice to get it back up and running again. I can't detect any pattern for this (it seems to happen about once a month, more or less). Here's a screenshot of my console during the last crash: I would assume that a possible cause might a PHP script or an apache configuration rule that might cause the crash if triggered? How would I be able to find out which one is the offending one? I've checked and rechecked all my PHP scripts, and running them doesn't seem to trigger the crash. I've also been able to log on to my system during a crash and see what's running (with top), but I can't tell how the offending process was started, so I can't trace the root of the problem! I know my description is overly generic, but unfortunately my expertise in tracking down the source of these glitches is very limited. If you need any additional information about my system in order to help me figure this out, please let me know in the comments, and I will append it to the question. My only other lead as to the culprit here is Wordpress, which we have installed on this server. Here are the details: Wordpress 3.0.3 with the following plugins installed and activated: Addmarx - Bookmark/Share/Email Dropdown, Akismet, All in One SEO Pack, Animated Banners, Automatically publish highlights of any website, directly to your Blog, Broken Link Checker, CMS Dashboard, Collapsing Categories, Status Updater, SubHeading, Ultimate Google Analytics, VastSubCat, WP-CMS Post Control, and WP Super Cache

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• OpenVPN - Cannot browse ipv4 websites

  - by user1494428

  I have set up an openVPN tunnel on my VPS (OpenVZ - Ubuntu 12.04). The problem is I can only browse websites which support ipv6 like google. http://whatismyv6.com/ reports me that I've an ipv6 adress, so I guess this is the problem. Server configuration: dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/easy-rsa/keys/server.key dh /etc/openvpn/easy-rsa/keys/dh1024.pem push "route 10.8.0.0 255.255.255.0" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" push "redirect-gateway def1" comp-lzo persist-tun persist-key status openvpn-status.log log /var/log/openvpn.log verb 3 Client configuration: client remote xx.xx.xx.xx 1194 dev tun comp-lzo ca ca.crt cert client1.crt key client1.key redirect-gateway def1 verb 3 I have configured NAT with this command: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to xx.xx.xx.xx Can someone explain me how I can make it works (forcing ipv4?) I had the same problem with another vps and I also tried on another client (All Windows 7).

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• Map a URL bought with Dreamhost to Amazon EC2 (AWS)

  - by Edan Maor

  I have several URLs I purchased through Dreamhost. I'm starting to use Amazon's AWS, and I'd like to map the URLs to Amazon. This is something of a silly question, and I've already done the same thing several times to other services (mapping from Dreamhost to WebFaction). But for some reason when I tried to find the proper way to do the same mapping to Amazon, I find a lot of detailed writing talking about whether I should be using CNAME or A records, etc. So I wanted to ask in the simplest possible terms and hopefully get a simple, concrete answer: I bought a URL from Dreamhost, I have an EC2 server running on AWS (to which I already mapped an Elastic IP address). How do I make the URL map to AWS? And if there are several options, which one should I effectively be using? P.S. Meta-question - why are things so much more difficult with AWS? When I search Google for "Move from Dreamhost to WebFaction, I get very simple answers on how to do the mapping. In what way is AWS different?

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• How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 (on server) (set as gateway on client) 2001:db8::100:abc:2 tap0 (on client) 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). net.ipv6.conf.all.forwarding is set to 1, I've tried disabling net.ipv6.conf.all.accept_ra as well, without luck. Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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• How can I make IPv6 on OpenVPN work using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 server side (set as gateway on client) 2001:db8::100:abc:2 tap0 client side 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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• How can laptop keyboard keys be removed and replaced?

  - by Lord Torgamus

  I'm trying to fix a laptop keyboard that has issues with keys on its left side. Just by feel, it's clear that something sticky got under there. There could be something crunchy too, but that might just be the sound of the key's spring releasing itself from the sticky. I don't know the cause because it's not my computer and the owner isn't sure, but I'm guessing soda spill for now. The computer is an HP dv2500. I've removed the keyboard and blown under it but that hasn't helped. I didn't use compressed air because I just don't have any available, but I suspect it wouldn't help with sticky. So, I'd like to pop they keys off and clean with damp cotton swabs or similar. Is there a proper way to remove the keys? I've found some instructions via Google for non-laptop keyboards, but they don't seem like they'd work for me. Alternate solutions to the problem also welcome, but I've been curious about how to remove the keys for some time for other reasons.

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• How to send from my Z88 to my PC

  - by Bevan

  I've got a Cambridge Z88 that I want to get working with my PC. Around 6 years ago - in 2004 - I made heavy use of my Z88 to do a whole bunch of writing on the train while commuting to and from work. The Z88 is solid state, lightweight and has a full size silent keyboard, so it works very well as a writing instrument. I still have the serial cable I soldered up back then and used successfully in 2004. It has these connections: Z88 9 pin ----- ------- 2 TxD ------> RxD 2 3 RxD <------ TxD 3 7 GND <-----> GND 5 4 RTS ------> CTS 8 5 CTS <-+ RTS 7 8 DCD <-+---- DTR 4 9 DTR ----+-> DCD 1 +-> DSR 6 Unfortunately, I haven't been able to find my notes from 2004 that describe how I got it to work back then. I've spent several hours trying to Google a result, but to no avail. I'm pretty sure the cable is fine - after all, it's what I used successfully six years ago, and I've checked it out with a multimeter - so I'm focusing on the PC end of things, which is where I'd like some assistance. Q1: In my recent attempts, I've been using both Hyperterminal (as built into Windows XP) and the command line (copy com2: con:), but with no success. What's a good (better!) serial communications application to use? Is there one that allows me to see as deep as the signalling that's occurring on the wire? Q2: If you have a Z88 that works correctly with your PC, what software do you use on the PC end, and what's the pinout of your cable? I'm pretty sure that the Z88 itself is working properly: When using the built in Import/Export tool to send a file, I see different behaviour when my serial cable is connected compared to disconnected. When disconnected, the transmission appears to work, with a progress meter counting up and then finishing; when connected, nothing happens 'cept a timeout if I wait long enough.

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• How to correctly deploy Adobe Reader 9.1

  - by Ben Gillam

  Hi I have recently tried to deploy Adobe Reader 9.1 onto our network here. (SBS 2003 server and XP Workstations) I followed the instructions for the extraction of the installer and .msi and then creating a .mst transform file to set custom options. (Suppress EULA, dont create desktop icon etc) I then added the package to my deployment GPO applied the relevant .mst file and preceded to deploy accross the network. The software package is computer assigned to be installed prior to logon, to avoid user permissions issues. The package deploys correctly to computers and will run perfectly fine if you run from a shortcut, however when trying to view a pdf from within a web browser it fails with the following message. "The adobe acrobat/reader that is running can not be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again" I have found many pages on google refering to this problem, but none appear to be in relation the problems I have found. http :// kb2.adobe.com/cps/405/kb405461.html These fixes recommend correcting a registry entry (which i should mention is missing after the deployed installation. However this does not work. Switching off display in a browser - Seems to defeat the object of fixing the problem Removing old versions - There arent any. Trying with a different user - This affects all users of all privalige levels on all computers. On my workstation I uninstalled Acrobat Reader 9.1 then reinstalled manually using the same installation source files and it works fine. has anyone sucsessfully deployed AR9.1 on their domain and if so how? For the time being I have downloaded the older 8.1.3 release and deployed this in the same way which works fine, but would like to be using the up to date version. Thanks

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• Why is it a bad idea to use a customer email as the from address

  - by Crab Bucket

  I've got an application that emails users once they have filled in a form. It uses a [email protected] as a from address. The customer wants it to use the email from the form as the from address which could be anything. I have been told that this is a bad idea due to spoofing/blacklisting and spam. I feel really vague about the exact reason about why this is a bad idea particularly as i've got to try to counsel the client out of this. Can someone explain to me why this is a bad idea. Interestingly the client has used a gmail account as the from address as a demo which not only works fine but has enabled the application to start sending emails (it wouldn't do it before with an email which was [email protected]). Erm - what is going on. I'm told one thing and the opposite works. Sorry - i know this is basic but I could find anything on a google search. Largely I think because I'm having trouble even framing the question. EDIT Thank you everyone - great answers. Interestingly the server sending the email and the mail box that it is going to are both behind the same firewall so the client says they are unconcerned about spam. Oh well.

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• BIND: forward 1st level zone

  - by raven

  First of all: sorry for the language, English is not my primary language. I have star-like DNS structure with many filials (more that 2): ^ | v filialNS_1.filial_1.city.local <---- ns.main.city.local <---- filialNS_2.filial_2.city.local ^ | v ns.mail.city.local is slave of all filials zones filialNS_1 is master of filial_1.city.local filialNS_2 is master of filial_2.city.local filialNS_N is master of filial_N.city.local I want to: serve DNS queries for xxx.filial_N.city.local with filialNS_N.filial_N.city.local forward all queries for xxx.xxx.xxx.local from filialNS_N to ns.main.city.local forward other queries to our provider's DNS on filial (or google-public-dns or anything else) FILIAL CONFIG named.conf zone "filial_1.city.local" { type master; file "/etc/namedb/dynamic/filial_1.city.local"; allow-update { key DHCP_UPDATER; }; allow-transfer { <ns.main.city.local IP address> }; }; zone "2.76.10.in-addr.arpa" { type master; file "/etc/namedb/dynamic/2.76.10.in-addr.arpa"; allow-update { key DHCP_UPDATER; }; allow-transfer { <ns.main.city.local IP address> }; }; zone "local." { type forward; forward only; forwarders { <ns.main.city.local IP address> }; }; nslookup server.filial_1.city.local - works fine nslookup server.main.city.local Server: 127.0.0.1 Address: 127.0.0.1#53 ** server can't find server.main.city.local: NXDOMAIN Where am I going wrong?

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• Manual NAT on Checkpoint (Redirect all http requests to a local web server)

  - by kulakli

  Hi, We have a proxy server in internal network and I want to redirect all internet http requests to a web server in local network. It'll be like a Network Billboard that say "No direct connection is available. Set up your proxy etc." For example: A user starts the computer Opens the browser Trys to open www.google.com Should see web server output on local network Trys another web site on internet Should see web server output on local network Sets up proxy Trys to connect to a web site Web site should be loaded I have added a simple manual NAT rule to address translation in Checkpoint firewall but it simply does not work. Here is my address translation rule Source Destination Service T.Source T.Destination T.Service MY_PC A_GOOGLE_IP ALL ORIGINAL INT_WEB_SRV ORIGINAL Then when I ping A_GOOGLE_IP, replies come from INT_WEB_SRV, as I expected. However, when I try to connect A_GOOGLE_IP from browser (http://A_GOOGLE_IP), No replies come from SYN_SENT and falls into timeout. When I look at the firewall log of INT_WEB_SRV, I can see the incoming connection requests from MY_PC is accepted and NO denies. By the way, there is no problem to see INT_WEB_SRV (http://INT_WEB_SRV) from browser. My understanding is, my nat rule at checkpoint NGX R60 does not include return packets. I definitely need some help. Regards, Burak

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• Discover the public ip of a network without being connected

  - by Martin Trigaux

  Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip address of the network ? I know the MAC address of the users connected on the network but do I know the one of the router ? If yes, maybe there is a way to do the matching. I know IP addresses are not forever but some addresses are static and never change. Maybe there is a database of MAC address having recorded that. Google has a database that match MAC address and geographical coordinates so why not with IP addresses ? Other idea, if I know where am I, I can maybe guess the IP range used in the city by the ISP (is it findable ?) and then try to "ping" each IP on the range (if it is a /24, it's possible, even /16 maybe). Will I get some information like the MAC of the box or see some traffic on the network ? These are two ideas I had. I don't know if they are doable, certainly not perfect. Do you think of some others ? By trying several methods, maybe I can get a guess with a bit of luck. Thank you

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• What's the best / easiest way to combine two mailboxes on Exchange 2007?

  - by jmassey

  I've found this and this(2) (sorry, maximum hyperlink limit for new users is 1, apparently), but they both seem targeted toward much more complex cases than what I'm trying to do, and I just want to make sure I'm not missing some better approach. Here's the scenario: 'Alice' has retired. 'Bob' has taken over Alice's position. Bob was already with the organization in a different but related position, and so they already have their own Exchange account with mail, calendars, etc., that they need to keep. I need to get all of Alice's old mail, calendar entries, etc., merged into Bob's existing stuff. Ideally, I don't want to have all of Alice's stuff in a separate 'recovery' folder that Bob would have to switch back and forth between to look at older stuff; I want it all just merged into Bob's current Inbox / Calendar. I'm assuming (read: hoping) that there's a better way to do this than fiddling with permissions and exporting to and then importing from a .pst. Office version is 2007 for everybody that uses Exchange, if that helps. Exchange is version 8.1. What (preferably step-by-step - I'm new to Exchange) is the best way to do this? I can't imagine this is an uncommon scenario, but my google-fu has failed me; there seems to be nothing on this subject that isn't geared towards far more complex scenarios. (2): h t t p://technet.microsoft.com/en-us/library/bb201751%28EXCHG.80%29.aspx

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• Looking for a small, portable, port-mirroring ethernet switch.

  - by user37244

  I recently had a mac go haywire, taking half a minute or more to get www.google.com loaded. Getting its owner to give up the machine for repair was like pulling teeth - they were insisting that it must be something to do with the network, since so much had changed with the local configuration at about the same time their box went haywire. I eventually set up a port mirror to a box that I could remote to so I could show that the mac was only irregularly getting packets onto the network. Demonstrating this faced an additional challenge: the latency of the remote desktop software I was using meant that I had to point to timestamps instead of just the moment the packet flashed up on the screen as my evidence. This particular user was the reason this was so challenging this time around, but I would like to have a box that I can cart from desk to desk to use wireshark on my laptop at any station where I need it. 3com, cisco, netgear, etc. (ad nauseum), all make switches that can be configured for port mirroring, but in my case, the smaller, the better. For the sake of my sanity, I'll probably end up running it off a battery anyway. If my laptop had two ethernet ports, this would be easy. So, whaddya recommand for a device that requires 0 configuration at each powerup (though I'm fine with poking at it for a while to set it up initially.) Small, light, and cheap enough to get it past purchasing? Thanks,

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• Ubuntu Natty 11.04, Turning the wireless switch off; switches it off permanently!

  - by ZiGi

  i'm using an hp pavilion dv2000 i turned the wifi switch off by mistake, the LED turned orange and the wifi got disconnected. and now when i turn the switch on, it remains orange and the wifi still isn't functional. this happened before; i found a fix that worked searching google. it was done via terminal commands and i didn't have to download anything but i can't find the solution anymore! wlan0 shows up when i use: :~$iwconfig #BLA BLA BLA #... wlan0 IEEE 802.11abg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off more results: :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: yes Hard blocked: yes :~$ sudo rfkill unblock all :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: no Hard blocked: yes :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill it's still hard blocked! even though the switch is turned on; gives the same result eitherways a direction to a page with a working solution is a much appreciated answer!

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• how to diagnose a hard system seizure? Dell+Ubuntu

  - by rob

  I've got Ubuntu 9.10 on a Dell Vostro 420 desktop, a little over a year old, which I use for plain vanilla work stuff (email, web, terminal, text editor). Every now and then, at totally random times, it completely freezes on me. Hard. Mouse and keyboard stop working, cursor stops blinking, clock stops moving. All I can do is hold down the power button on the front of the box to shut it off. Sometimes it happens after several months of continuous uptime; sometimes it happens a few minutes after a reboot, while all I've done is open a terminal to look at log files, or maybe firefox to do a google search. Each time, there is nothing at all in /var/log/messages at the time of the crash. This makes it seem like a hardware problem, and indeed a few months ago I opened the box and wiggled everything and the problem went away for a while. But now it's back. I went in and checked everything, took out each RAM card and reseated. No luck. I ran all the system diagnostics (the long version) and everything passed with flying colors. Something is messed up in this box, but without any useful logs or failed tests, how in the world am I going to find it? And of course, Dell's not gonna help me cause I went and replaced Windows with Ubuntu. What steps would you take next to track down this problem?

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• How to remotely connect using perfmon?

  - by user36914

  Suprised there is not a ton of information on google when i search for this but there is not. Lot of people asking the question but i none of them have any good answers. I have a remote computer running hyper-v (server) running a Windows 7 x64 guest (guest). Occasionally i won't be able to remote desktop to guest. I will then remote to server and see that the guest instance is constantly using about 25% of the cpu. WHen i try to connect directly from server i will get the login screen but as soon as i type the password in it will just stay at the windows 7 login screen but the account names will disappear and it will not log in. It responds to pings though. I don't know how else to diagnose other than trying to run perfmon remotely. It only happens like every 3 weeks and i run it 24/7. So i'm trying to run remote desktop remotely. I tested this out on a local vm i have running under vmware. When i try to connect using perfmon to my local vm i get this error: "when attempting to connect to the remote computer the4 following system error occurred: the network path was not found" I found in another past to start the remote registry service and when i start the service i get this error: "No such interface supported" Anyways, how do i remotely connect to another machine with perfmon or if anyone has a better idea how i can diagnose the problem above then let me know.

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• Raspberry pi slows down my entire network

  - by gnusouth

  Whenever my Raspberry Pi is connected to the network (via ethernet) the entire network is slowed to a crawl. On my main computer, ping times for google.com go from ~10ms to ~200ms and it takes forever to load web pages. Connections are also slow on the Pi, with an apt-get update showing pathetic speeds in the order of 1KB/s. Turning off the Pi completely removes the drag from the network. I've tried static and dynamic IP addresses for the Pi, but both have the same problems. I'm currently using Raspbian (downloaded today), but also had this problem with Arch Linux. I've checked the connection's duplex with dmesg | grep -i duplex, which shows that the Pi's connection is running at 100Mbps, full-duplex, as expected. My modem/router is a Billion 7404VNPX (an Australian thing); relatively high-end, albeit a bit buggy at times (it will occassionally delete all its firewall settings). It assigns IPs in the range 192.168.1.1 to 192.168.1.20 and has 192.168.1.254 as its own IP. When I assign static IPs I tend to use the 192.168.1.200 area. Does anyone have any idea as to what could be causing this weird slowdown? Or any tests I could try? Thanks

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• openvpn port 53 bypasses allows restrictions ( find similar ports)

  - by user181216

  scenario of wifi : i'm using wifi in hostel which having cyberoam firewall and all the computer which uses that access point. that access point have following configuration default gateway : 192.168.100.1 primary dns server : 192.168.100.1 here, when i try to open a website the cyberoam firewall redirects the page to a login page (with correct login information, we can browse internet else not), and also website access and bandwidth limitations. once i've heard about pd-proxy which finds open port and tunnels through a port ( usually udp 53). using pd-proxy with UDP 53 port, i can browse internet without login, even bandwidth limit is bypassed !!! and another software called openvpn with connecting openvpn server through udp port 53 i can browse internet without even login into the cyberoam. both of softwares uses port 53, specially openvpn with port 53, now i've a VPS server in which i can install openvpn server and connect through the VPS server to browse internet. i know why that is happening because with pinging on some website(eb. google.com) it returns it's ip address that means it allows dns queries without login. but the problem is there is already DNS service is running on the VPS server on port 53. and i can only use 53 port to bypass the limitations as i think. and i can not run openvpn service on my VPS server on port 53. so how to scan the wifi for vulnerable ports like 53 so that i can figure out the magic port and start a openvpn service on VPS on the same port. ( i want to scan similar vulnerable ports like 53 on cyberoam in which the traffic can be tunneled, not want to scan services running on ports). improvement of the question with retags and edits are always welcomed... NOTE : all these are for Educational purpose only, i'm curious about network related knowledge.....

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• central apache log analysis of many hosts

  - by Jason Antman

  We have 30+ apache httpd servers, and are looking to perform analysis on the logs both for historical trending and near "real time" monitoring/alerting. I'm mainly interested in things like error rates (4xx/5xx), response time, overall request rate, etc. but it would also be very useful to pull out more compute-intensive statistics like unique client IPs and user agents per unit of time. I'm leaning towards building this as a centralized collector/server/storage, and am also considering the possibility of storing non-apache logs (i.e. general syslog, firewall logs, etc.) in the same system. Obviously a large part of this will probably have to be custom (at least the connection between pieces and the parsing/analysis we do), but I haven't been able to find much information on people who have done stuff like this, at least at shops smaller than Google/Facebook/etc. who can throw their log data into a hundred-node compute cluster and run Map/Reduce on it. The main things I'm looking for are: - All open source - Some way of collecting logs from apache machines that isn't too resource-intensive, and transports them relatively quickly over the network - Some way of storing them (NoSQL? key-value store?) on the backend, for a given amount of time (and then rolling them up into historical averages) - In the middle of this, a way of graphing in near-real-time (probably also with some statistical analysis on it) and hopefully alerting off of those graphs. Any suggestions/pointers/ideas, to either "products"/projects or descriptions of how other people do this would be greatly helpful. Unfortunately, we're not exactly a new-age-y devops shop, lots of old stuff, homogeneous infrastructure, and strained boxes.

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• Internet in the router but not in the local network.

  - by TheMouse

  I have a PC and a laptop (Windows 7 - both) which should connect through router to Internet. The router is Linksys wrt120. My ISP is using PPPoE. I have connected the Internet cable to the router, clone the MAC of my PC, writing the username and the password for my Internet connection. After seconds the router has acquired IP from my ISP. I have used the administration panel of Linksys and with the help of the ping and tracert commands which are built into it - I can connect to the world, outside the network. The problem is when I try to connect the PC or the laptop to the network. There's no problem here. The DHCP server of the router gives them appropriate addresses. The problem is that they couldn't connect to either Internet addresses (google.com) or IP addresses. But they can connect to the router and its control panel. I tried several times, reset the router..but there's no Internet..still.

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• Alfa AWUSO36H 1W dysfunctional driver

  - by BrainStorm

  I recently purchased an Alfa AWUSO36H 1W wireless USB adapter for my notebook, in order to improve signal strength and quality. I'm currently using Linux Mint 11, and the it uses the RTL8187 driver for this adapter, I'm also using a 4dbi antenna, though I have others. The problem is that this adapter does exactly the opposite of what it should, actually my internal Broadcom BCM4313 adapter works way better than the alfa. Browsing is slow, some network applications don't even work, pings against Google.com on the internal adapter runs smooth, while in the alfa it gets like 25% packets lost or more! I'm less them 50 feet from my AP, the internal adapter gets 44/70 link quality, and the alfa gets around 60/70 (iwconfig output). Also the system always sets alfa power to 20dbm(100mw), then I have to do sudo iw set reg B0 to make it 30dbm(1000mw), but apparently no significant change. I've installed wireless-compat drivers, no change either. And worst of all, in Windows 7 it works way more smoothly for browsing, though I couldn't test it properly there. I hope its a driver problem, even if it's a pain to find/compile Linux drivers for a starter, I prefer it to a hardware problem where I would need to buy another adapter, since I have no money left (except for the cantenna pieces).

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• High speed network configuration

  - by Peter M

  Sorry if this seems to be a stupid question, I'm not sure how to specify what I want to know when checking google. I will have 2 or 3 devices pumping out data on a 100Base-T port. The combined data rate of all devices is about 15KB/S which exceeds the optimal 100Base-T channel capacity (12KB/S), but well within the realms of a 1000Base-T connection. Each device will be sending a burst of data in the form of an FTP transfer to a common, single host computer in a sequential manner ie: Device A establishes FTP connection and transfers data Device B establishes FTP connection and transfers data Device C establishes FTP connection and transfers data It may be that the A&B, B&C and C&A transfers overlap in the time domain to some extent. There will be minimal traffic going back from the computer to each device (in general what ever is needed to support the FTP transfers), and the network will be dedicated to transferring data between these devices and the host computer. Is it possible to use a switch to combine the multiple incoming 100Base-T streams into a single outgoing 1000Base-T stream? if so what features in a switch should I be looking for? Or would it be better to have 3 physical point-to-point 100Base-T dedicated connections between each device and the host computer? (thus having at least 3 physical Ethernet interfaces on that computer) Note that I can't change the interface on the devices, but I am free to choose the network and host computer configuration. Thanks for you help Peter

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