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• Double VPN Network Authentication

  - by Pyromanci

  I have a project I'm working on and looking for some info. Right now I have a VPN network using Cisco Pix 501's for the vpn clients and a Cisco VPN Concentrator 3000 for the VPN Server. Since the Pix is constantly connected to the vpn, I want to add a extra level of authentication. Meaning when the user on the other end goes to access anything on the VPN they are asked for a username password before the connection is established. I've never done this sort of structure before. So I'm not even sure where to really being or even if my current hardware can do something like this, or if i need to through in some sort of radius/LDAP/Active Directory type server into the mix.

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• Direct DB to Web Server connection

  - by Joel Coel

  I have a database server sitting right underneath a virtual machine host server in the rack, and this vm host is primarily responsible for servers hosting a couple different web sites and app servers that all talk to databases on the other server. Right now both servers are connected to the same switch, and I'm pretty happy with the pathing. However, both servers also have an unused network port. I wondering about the potential benefits of using a short crossover or normal+auto mdix network cable to connect these two servers together directly. Is this a good idea, or would I be doing something that won't show much benefit and is just likely to trip up a future admin who's not looking for this? The biggest weakness I can see right now is that this would likely require a code change for each vm app to point to the new IP of the database server on this private little network, and if I have a problem with the virtual machine host and have to spin up it's guests elsewhere while I fix it I'll have to change this back before things will work.

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• How do I configure tinydns (with fefe's IPv6 patch) to listen on IPv6 address?

  - by Christian Hudon

  I'm setting up my network to support IPv6. I have static IPv6 addresses assigned to each interface of my router, and radvd advertising different prefixes on each interface. The next step would be to get my dnscache (from djbdns) working on IPv6. Said dnscache has fefe's IPv6 patch applied, so I assume it should work with IPv6. However, I can't find any documentation online on how to make the patched dnscache listen on IPv6. How do I configure tinydns and dnscache to listen on IPv6 too?

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• Apache access.log interpretation

  - by Pantelis Sopasakis

  In the log file of apache (access.log) I find log entries like the following: 10.20.30.40 - - [18/Mar/2011:02:12:44 +0200] "GET /index.php HTTP/1.1" 404 505 "-" "Opera/9.80 (Windows NT 6.1; U; en) Presto/2.7.62 Version/11.01" Whose meaning is clear: The client with IP 10.20.30.40 applied a GET HTTP method on /index.php (that is to say http://mysite.org/index.php) receiving a status code 404 using Opera as client/browser. What I don't understand is entries like the following: 174.34.231.19 - - [18/Mar/2011:02:24:56 +0200] "GET http://www.siasatema.com HTTP/1.1" 200 469 "-" "Python-urllib/2.4" So here what I see is that someone (client with IP 174.34.231.19) accessed http://www.siasatema.com and got a 200 HTTP status code(?). It doesn't make sense to me... the only interpretation I can think of is that my apache server acts like proxy! Here are some other requests that don't have my site as destination... 187.35.50.61 - - [18/Mar/2011:01:28:20 +0200] "POST http://72.26.198.222:80/log/normal/ HTTP/1.0" 404 491 "-" "Octoshape-sua/1010120" 87.117.203.177 - - [18/Mar/2011:01:29:59 +0200] "CONNECT 64.12.244.203:80 HTTP/1.0" 405 556 "-" "-" 87.117.203.177 - - [18/Mar/2011:01:29:59 +0200] "open 64.12.244.203 80" 400 506 "-" "-" 87.117.203.177 - - [18/Mar/2011:01:30:04 +0200] "telnet 64.12.244.203 80" 400 506 "-" "-" 87.117.203.177 - - [18/Mar/2011:01:30:09 +0200] "64.12.244.203 80" 400 301 "-" "-" I believe that all these are related to some kind of attack or abuse of the server. Could someone explain to may what is going on and how to cope with this situation? Update 1: I disabled mod_proxy to make sure that I don't have an open proxy: # a2dismod proxy Where from I got the message: Module proxy already disabled I made sure that there is no file proxy.conf under $APACHE/mods-enabled. Finally, I set on my browser (Mozzila) my IP as a proxy and tried to access http://google.com. I was not redirected to google.com but instead my web page appeared. The same happened with trying to access http://a.b (!). So my server does not really work as a proxy since it does not forward the requests... But I think it would be better if somehow I could configure it to return a status code 403. Here is my apache configuration file: <VirtualHost *:80> ServerName mysite.org ServerAdmin webmaster@localhost DocumentRoot /var/www/ <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> Update 2: Using a block, I restrict the use of other methods than GET and POST... <Limit POST PUT CONNECT HEAD OPTIONS DELETE PATCH PROPFIND PROPPATCH MKCOL COPY MOVE LOCK UNLOCK> Order deny,allow Deny from all </Limit> <LimitExcept GET> Order deny,allow Deny from all </LimitExcept> Now methods other that GET are forbidden (403). My only question now is whether there is some trick to boot those how try to use my server as a proxy out...

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• Incorrect Windows 7 "No Internet Access" notice

  - by Joel Coehoorn

  In windows 7, I have a wifi network that shows up with a warning icon overlay and the "No internet access" description as shown in this image: The other network shown there is a VirtualBox VM, and is expected to show that way. Plainly, this notice is wrong as I have been browsing with that connection all afternoon and used it to post this question. So my question is, what makes this message come up, and how can I make it go away?

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• Creating an office network and monitoring all activity without a proxy

  - by Robert

  We are setting up our office network and would like to track all the websites visited by our employees. However, we would not like to use any proxy based solutions. Our work is highly dependent on applications in which you cannot configure a proxy. Hence, the approach we would like to follow is setting up a router inside a computer (something like this : http://www.techrepublic.com/article/configure-windows-server-2003-to-act-as-a-router/5844624) This will also allow us to attach multiple ethernet cards and have redundancy in internet connectivity with complete abstraction from the user about which connection is being used. But most importantly, since all the traffic will be going through the computer (configured as a router) I assume there will be a way to run packet analysis on all the request / responses being made. For example, list all the FTP servers connected to (port 21), give a graph of all the URLs visited per day by frequency. Is there already a software which does this ? Or is it possible to build something like this ?

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• How do I configure my ASUS WL-520GU to support my F2238's flatbed scanner for MacOS X?

  - by Avry

  I have an ASUS WL-520GU and an HP Deskjet F2238. I want to be able to wirelessly scan documents to client computers. I think this is possible but I'm not sure how to set this up. Any pointers? Thanks!

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• Why is my eth0 getting a dynamic ip when it is configured to be static?

  - by sdek

  For some reason our office linux box is being assigned an ip address via dhcp and I don't know why. What is confusing to me is that when I check system-config-network it shows that my eth0 is setup to be a static ip address. And /etc/sysconfig/network-scripts/ifcfg-eth0 also shows it is setup to be a static ip, yet it is getting a different ip address than the one specified in the ifcfg-eth0. Let me know if you have any suggestions on or ideas on where I can look next. Here are a few details that might help you figure out what an idiot I am :) Fedora 11 Router in front of this box is running dhcp, starting at 10.42.1.100 This box is configured to be 10.42.1.50 (at least I think it is!), subnet 255.255.255.0 (which is same as the router's lan subnet) Instead of having the static IP, this box is getting assigned 10.42.1.100. Here are the ifcfg-eth0 details DEVICE=eth0 BOOTPROTO=none ONBOOT=yes TYPE=Ethernet USERCTL=no NM_CONTROLLED=no NETMASK=255.255.255.0 IPADDR=10.42.1.50 GATEWAY=10.42.1.1

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• Netgear router-speed problem after XBox use

  - by John Dudley

  When my son is at my place at the weekend, he plays XBox Live over the internet, using my wireless network (Netgear 'g' type router). This usually thrashes & crashes the router to the extent I have to hard-boot it to get it working again. However, after this weekend, on my two laptops, I'm left with the problem that the router is working, but I'm only getting 0.38Mbps out of it, at all times of the day. I've tried hard-booting the router, but no difference. Could this be a knock-on effect of the Xbox use? I can't believe the router could be damaged, but working slower? Is that possible? Tiscali haven't come back to me yet on any 'network' issues. Thanks in advance

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• Multicasting and multicast address

  - by Zia ur Rahman

  I have confusion about the multicast addresses, I have read an example which is given by. Suppose two applications have been built to send audio over a network. One application accepts and digitizes an audio input stream, and then sends the resulting frame across the network to other application. The second application receives the digitized audio from the network, converts it back to the audio signal and plays the result over a speaker. Unless the two applications use broadcast to send frames, no other computers on the network will receive a copy of the frame. Multicasting provides an excellent solution to the problems of allowing some computers to participate in audio transmission. To use multicasting , a multicast address must be chosen for the audio application. And the receiving application passes the multicast address to the network interface. The interface begins to accept the packets sent to that address. Question: how this multicast address is chosen, how the receiving application knows that the sender using this specific destination address for the audio frames.

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• Wireless disconnects at random after upgrade to Ubuntu 10.4

  - by Daniel Elessedil Kjeserud

  After upgrading my home server from Ubuntu 8.10 to 10.4 my wireless seemingly drops out, even though my IRC client keeps it's connection to the servers, so it looks like the machine just stops taking wireless requests. A ping will give a me this Request timeout for icmp_seq 27 ping: sendto: Host is down After a while the machine just starts responding again, without any interaction from me. When the machine comes back, this is what dmesg gives me [ 18.296288] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.296350] wlan0: deauthenticating from 00:1b:63:22:a4:5f by local choice (reason=3) [ 18.296440] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.298697] wlan0: direct probe responded [ 18.298706] wlan0: authenticate with AP 00:1b:63:22:a4:5f (try 1) [ 18.306836] wlan0: authenticated [ 18.306886] wlan0: associate with AP 00:1b:63:22:a4:5f (try 1) [ 18.309396] wlan0: RX AssocResp from 00:1b:63:22:a4:5f (capab=0x411 status=0 aid=2) [ 18.309402] wlan0: associated [ 18.310187] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 18.447742] apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac) [ 18.447748] apm: overridden by ACPI. [ 19.163282] padlock: VIA PadLock not detected. [ 28.352022] wlan0: no IPv6 routers present kjes@brin:~$ lspci 02:07.0 Network controller: RaLink RT2561/RT61 rev B 802.11g It's on a wireless network with WPA2, the machine worked without any problems on the same wireless network since Ubuntu 8.10 was the most resent version, and there have been no changes to my network recently. Even though the server drops out, everything else on the network keeps working like normal.

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• How to tell Windows 7 to ignore a default gateway

  - by zildjohn01

  I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192.168.0.x). Windows seems to recognize them correctly (my "Network and Sharing Center" lists them as "No Internet" and "Internet" respectively), however when I try browsing the internet it always tries the internal network's default gateway, rather than the one with internet access. Trying to ping a website results in "Reply from 10.0.0.1: Destination net unreachable.". A simple "route delete 0.0.0.0 mask 0.0.0.0 10.0.0.1" fixes the problems, but they return upon reboot, or upon renewing my IP. Is there any way to tell Windows to ignore one NIC's default gateway, or to at least give them priorities?

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• Windows Hosted Network Redirect to IIS

  - by rulestein

  I would like to setup a Windows 7 machine as a wifi hotspot that always redirects to the IIS web hosting on the same machine. I have the hotspot piece working with the built in hosted network of Widnows 7. The webhosting was easy enough with IIS. Now, how do I connect the 2? The idea is to have a standalone device that users will be able to connect to the wifi and any webpage they go to will redirect to the internal webpage. I only expect 1 or 2 users at a time and there won't be any internet access involved.

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• Why can I view my site over a 3G connection but not through my wifi?

  - by Jonathan

  So, I am sitting in my office with four computers on the same network and internet connection. Two of the computers can visit this particular website. Two of the computer get a message "Google Chrome could not find". I have tried FF and IE also with the same problem. I can view the site 90% of the time on two of the working computers although the site seems slow and sometimes I also get the same errors as the other two computers. I have flushed the DNS, reset the router, tested the site on other peoples computers with success. Is this likely to be a site issue, an ISP issue, a hosting issue? Any advice is greatly appreciated. Here is the ping from the working machine: C:\Users\Jon>ping www.balihaicruises.com Pinging www.balihaicruises.com [208.113.173.102] with 32 bytes of data: Reply from 208.113.173.102: bytes=32 time=331ms TTL=47 Reply from 208.113.173.102: bytes=32 time=327ms TTL=47 Reply from 208.113.173.102: bytes=32 time=326ms TTL=47 Reply from 208.113.173.102: bytes=32 time=329ms TTL=47 Ping statistics for 208.113.173.102: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 326ms, Maximum = 331ms, Average = 328ms Traceroute: Tracing route to www.balihaicruises.com [208.113.173.102] over a maximum of 30 hops: 1 1 ms 17 ms 3 ms 192.168.1.1 2 42 ms 37 ms 36 ms 180.254.224.1 3 39 ms 47 ms 40 ms 180.252.1.69 4 36 ms 616 ms 57 ms 61.94.115.221 5 84 ms 76 ms 80 ms 180.240.191.98 6 73 ms 80 ms 72 ms 180.240.191.97 7 157 ms 143 ms 116 ms 180.240.190.82 8 115 ms 113 ms 120 ms ae1-123.hkg11.ip4.tinet.net [183.182.80.93] 9 331 ms 332 ms 335 ms xe-3-2-1.was14.ip4.tinet.net [89.149.184.30] 10 327 ms 330 ms 331 ms internap-gw.ip4.tinet.net [77.67.69.254] 11 437 ms 415 ms 350 ms border10.pc2-bbnet2.wdc002.pnap.net [216.52.127.73] 12 322 ms 823 ms 398 ms dreamhost-2.border10.wdc002.pnap.net [216.52.125.74] 13 328 ms 336 ms 326 ms ip-208-113-156-4.dreamhost.com [208.113.156.4] 14 326 ms 328 ms 336 ms ip-208-113-156-14.dreamhost.com [208.113.156.14] 15 327 ms 331 ms 333 ms apache2-udder.crisp.dreamhost.com [208.113.173.102] And then for the machine that doesn't work: C:\Users\Microsoft>ping www.balihaicruises.com Ping request could not find host www.balihaicruises.com. Please check the name and try again. C:\Users\Microsoft>tracert www.balihaicruises.com Unable to resolve target system name www.balihaicruises.com.

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• How to connect a Bluetooth network connection using the command line

  - by Ed Guiness

  I can enable a Local Area Network interface for my machine with the command netsh interface set interface "Local Area Connection" ENABLED Is there an equivalent command to connect a bluetooth network connection? I've tried netsh interface set interface "Bluetooth" ENABLED but it seems to have no effect, the connection remains disconnected. I also tried netsh interface set interface "Bluetooth" connect=CONNECTED but this returns One or more essential parameters not specified I know this Bluetooth connection is otherwise ok since I am able to connect using Control Panel Network Connections, right-clicking on Bluetooth Connect.

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• msi netbook refuses to connect to home wireless network (windows xp)

  - by sa125

  Hi - I'm trying to connect my girlfriend's MSI netbook to the wireless network in my house, and failing repeatedly. It's not a hardware issue, b/c it connects to other networks successfully, and, it's not a network issue, because I have another mac and linux laptops that have no problem detecting and connecting to the same network. When I open windows' network connections box, I can see the network available, and when I try to connect to it (using a password), I get a "network no longer in range.." error (the router is 2 ft away). This has been the case for the past 6 months, and I'm about to give up. I've reset the router, erased all saved network preferences and pretty much all I could think of short of re-installing XP. Any idea what else could be done? thanks.

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• mail server administration

  - by kibs

  MY postfix does not show that it is listening to the smtp daemon getting mesaage below: The message WAS NOT relayed Reporting-MTA: dns; mail.mak.ac.ug Received-From-MTA: smtp; mail.mak.ac.ug ([127.0.0.1]) Arrival-Date: Wed, 19 May 2010 12:45:20 +0300 (EAT) Original-Recipient: rfc822;[email protected] Final-Recipient: rfc822;[email protected] Action: failed Status: 5.4.0 Remote-MTA: dns; 127.0.0.1 Diagnostic-Code: smtp; 554 5.4.0 Error: too many hops Last-Attempt-Date: Wed, 19 May 2010 12:45:20 +0300 (EAT) Final-Log-ID: 23434-08/A38QHg8z+0r7 undeliverable mail MTA BLOCKED OUTPUT FROM lsof -i tcp:25 command master 3014 root 12u IPv4 9429 TCP *:smtp (LISTEN) (Postfix as a user is missing )

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• SSL FTP fails on Windows 7 but not Windows XP clients

  - by Andrew Neely

  We currently use a free SSL-FTP client called Move-It-Freely to transmit data from a custom data entry program at over forty facilities scattered around the state to our central server. Under XP, it works flawlessly. Some facilities have upgraded to Windows 7. On these machines, uploads (transfers to us) work, downloads (transfers from us to them) fail. Replacing the Windows 7 machine with an XP machine solves the problem. We have also verified that the network firewall settings have not changed. This problem persists even if Windows firewall is not running. We were able to remote into one of the Windows 7 machines to verify that the Windows firewall was indeed turned off. We cannot replicate the problem on our own Windows 7 machines, and are at a loss of how to fix this feature for our customers. The data contain health-related information, and needs to be encrypted (hence SSL-FTP.) Despite hours spent on Google, we cannot find a solution.

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• Block Skype on Cisco IOS

  - by ensnare

  I'm trying to block skype via policy routing but it's not working ... here's my configuration: class-map match-any block match protocol skype policy-map QoS-Priority-Input class block police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop policy-map QoS-Priority-Output class block police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop interface FastEthernet4 description WAN service-policy input QoS-Priority-Input service-policy output QoS-Priority-Output

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• Long connection times from PHP to MySQL on EC2

  - by Erik Giberti

  I'm having an intermittent issue connecting to a database slave with InnoDB. Intermittently I get connections taking longer than 2 seconds. These servers are hosted on Amazon's EC2. The app server is PHP 5.2/Apache running on Ubuntu. The DB slave is running Percona's XtraDB 5.1 on Ubuntu 9.10. It's using an EBS Raid array for the data storage. We already use skip name resolve and bind to address 0.0.0.0. This is a stub of the PHP code that's failing $tmp = mysqli_init(); $start_time = microtime(true); $tmp-options(MYSQLI_OPT_CONNECT_TIMEOUT, 2); $tmp-real_connect($DB_SERVERS[$server]['server'], $DB_SERVERS[$server]['username'], $DB_SERVERS[$server]['password'], $DB_SERVERS[$server]['schema'], $DB_SERVERS[$server]['port']); if(mysqli_connect_errno()){ $timer = microtime(true) - $start_time; mail($errors_to,'DB connection error',$timer); } There's more than 300Mb available on the DB server for new connections and the server is nowhere near the max allowed (60 of 1,200). Loading on both servers is < 2 on 4 core m1.xlarge instances. Some highlights from the mysql config max_connections = 1200 thread_stack = 512K thread_cache_size = 1024 thread_concurrency = 16 innodb-file-per-table innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 13G Any help on tracing the source of the slowdown is appreciated. [EDIT] I have been updating the sysctl values for the network but they don't seem to be fixing the problem. I made the following adjustments on both the database and application servers. net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_sack = 0 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_fin_timeout = 20 net.ipv4.tcp_keepalive_time = 180 net.ipv4.tcp_max_syn_backlog = 1280 net.ipv4.tcp_synack_retries = 1 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 87380 16777216 [EDIT] Per jaimieb's suggestion, I added some tracing and captured the following data using time. This server handles about 51 queries/second at this the time of day. The connection error was raised once (at 13:06:36) during the 3 minute window outlined below. Since there was 1 failure and roughly 9,200 successful connections, I think this isn't going to produce anything meaningful in terms of reporting. Script: date /root/database_server.txt (time mysql -h database_Server -D schema_name -u appuser -p apppassword -e '') /dev/null 2 /root/database_server.txt Results: === Application Server 1 === Mon Feb 22 13:05:01 EST 2010 real 0m0.008s user 0m0.001s sys 0m0.000s Mon Feb 22 13:06:01 EST 2010 real 0m0.007s user 0m0.002s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Application Server 2 === Mon Feb 22 13:05:01 EST 2010 real 0m0.009s user 0m0.000s sys 0m0.002s Mon Feb 22 13:06:01 EST 2010 real 0m0.009s user 0m0.001s sys 0m0.003s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Database Server === Mon Feb 22 13:05:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s Mon Feb 22 13:06:01 EST 2010 real 0m0.006s user 0m0.010s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s [EDIT] Per a suggestion received on a LinkedIn question, I tried setting the back_log value higher. We had been running the default value (50) and increased it to 150. We also raised the kernel value /proc/sys/net/core/somaxconn (maximum socket connections) to 256 on both the application and database server from the default 128. We did see some elevation in processor utilization as a result but still received connection timeouts.

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• TCP Tweaking options and Results: Any suggestions?

  - by krishnakumar

  I first tried with the default windows XP TCP option(It doesn't have TCPWindowSize option and TCP1323 in its Registry setting). I dynamically set those options using TCP optimizer. Here I list out the result with and without TCP Tweaking option. I see no major improvements in TCP after increasing window size optimally too. What value should I set to increase the performance? Results: Without any window size and MTU setting from server to client (receiving) TCPWindowSize : MTU : TTL: Size:586 MB total duration : 03:47 With window size extension from server to client (receiving) Bandwidth :100 Mbps Latency: 100ms BDP :1250000 TCPWindowSize : 1250000 MTU :1500 TTL:128 Size:586MB total duration : 03:44 With window size extension from server to client (receiving) TCPWindowSize :64240 MTU :1500 TTL :112 Size: 586MB total duration : 03:49

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• How should I set up my Hyper-V server and network topology?

  - by Daniel Waechter

  This is my first time setting up either Hyper-V or Windows 2008, so please bear with me. I am setting up a pretty decent server running Windows Server 2008 R2 to be a remote (colocated) Hyper-V host. It will be hosting Linux and Windows VMs, initially for developers to use but eventually also to do some web hosting and other tasks. Currently I have two VMs, one Windows and one Ubuntu Linux, running pretty well, and I plan to clone them for future use. Right now I'm considering the best ways to configure developer and administrator access to the server once it is moved into the colocation facility, and I'm seeking advice on that. My thought is to set up a VPN for access to certain features of the VMs on the server, but I have a few different options for going about this: Connect the server to an existing hardware firewall (an old-ish Netscreen 5-GT) that can create a VPN and map external IPs to the VMs, which will have their own IPs exposed through the virtual interface. One problem with this choice is that I'm the only one trained on the Netscreen, and its interface is a bit baroque, so others may have difficulty maintaining it. Advantage is that I already know how to do it, and I know it will do what I need. Connect the server directly to the network and configure the Windows 2008 firewall to restrict access to the VMs and set up a VPN. I haven't done this before, so it will have a learning curve, but I'm willing to learn if this option is better long-term than the Netscreen. Another advantage is that I won't have to train anyone on the Netscreen interface. Still, I'm not certain if the capabilities of the Windows software firewall as far as creating VPNs, setting up rules for external access to certain ports on the IPs of Hyper-V servers, etc. Will it be sufficient for my needs and easy enough to set up / maintain? Anything else? What are the limitations of my approaches? What are the best practices / what has worked well for you? Remember that I need to set up developer access as well as consumer access to some services. Is a VPN even the right choice?

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• How do I know how many bandwidth an individual application are consuming on Mac OS X?

  - by overboming

  I mean for individual application, if it doesn't provide this kind of functionality.

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• Using a MiFi via WDS

  - by Joril

  I have a Huawei R201 MiFi connected to the internet, and I'd like to use its internet connection even from devices that don't have WiFi, so I grabbed a wireless router I had lying around and configured WDS so that it'd connect to the MiFi, and this is working nicely (I can ping the MiFi from the router web interface). The next step was connecting my PC to the router via ethernet cable, but now I'm stuck... The PC can ping the router, but not the MiFi (they're all on the same subnet). Since the router can ping the MiFi, I guess this is some kind of routing issue? Should I get a more "flexible" router, such as one with DD-WRT maybe? Is what I'm trying to do even possible? (For the record the PC is running Lubuntu 11.10)

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• Setting up VPN client: L2TP with IPsec

  - by zachar

  I've got to connect to vpn server. It works on Windows, but in Ubuntu 10.04 not. Number of options is confusing for me. There is the input that I have: IP Address of VPN Pre-shared key to authenticate Information that MS-CHAPv2 is used Login and Password to VPN I was trying to achive that with network manager and with L2TP IPsec VPN Manager 1.0.9 but at failed. There is some logged information from L2TP IPsec VPN Manager 1.0.9: Nov 09 15:21:46.854 ipsec_setup: Stopping Openswan IPsec... Nov 09 15:21:48.088 Stopping xl2tpd: xl2tpd. Nov 09 15:21:48.132 ipsec_setup: Starting Openswan IPsec U2.6.23/K2.6.32-49-generic... Nov 09 15:21:48.308 ipsec__plutorun: Starting Pluto subsystem... Nov 09 15:21:48.318 ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d Nov 09 15:21:48.338 ipsec__plutorun: 002 added connection description "my_vpn_name" Nov 09 15:21:48.348 ipsec__plutorun: 003 NAT-Traversal: Trying new style NAT-T Nov 09 15:21:48.348 ipsec__plutorun: 003 NAT-Traversal: ESPINUDP(1) setup failed for new style NAT-T family IPv4 (errno=19) Nov 09 15:21:48.349 ipsec__plutorun: 003 NAT-Traversal: Trying old style NAT-T Nov 09 15:21:48.994 104 "my_vpn_name" #1: STATE_MAIN_I1: initiate Nov 09 15:21:48.994 003 "my_vpn_name" #1: received Vendor ID payload [RFC 3947] method set to=109 Nov 09 15:21:48.994 003 "my_vpn_name" #1: received Vendor ID payload [Dead Peer Detection] Nov 09 15:21:48.994 106 "my_vpn_name" #1: STATE_MAIN_I2: sent MI2, expecting MR2 Nov 09 15:21:48.994 003 "my_vpn_name" #1: NAT-Traversal: Result using RFC 3947 (NAT-Traversal): i am NATed Nov 09 15:21:48.994 108 "my_vpn_name" #1: STATE_MAIN_I3: sent MI3, expecting MR3 Nov 09 15:21:48.994 004 "my_vpn_name" #1: STATE_MAIN_I4: ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=oakley_3des_cbc_192 prf=oakley_sha group=modp1024} Nov 09 15:21:48.995 117 "my_vpn_name" #2: STATE_QUICK_I1: initiate Nov 09 15:21:48.995 004 "my_vpn_name" #2: STATE_QUICK_I2: sent QI2, IPsec SA established transport mode {ESP=>0x0c96795d <0x483e1a42 xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=none DPD=none} Nov 09 15:21:49.996 [ERROR 210] Failed to open l2tp control file 'c my_vpn_name' and from syslog: Nov 9 15:21:46 o99 L2tpIPsecVpnControlDaemon: Opening client connection Nov 9 15:21:46 o99 L2tpIPsecVpnControlDaemon: Executing command ipsec setup stop Nov 9 15:21:46 o99 ipsec_setup: Stopping Openswan IPsec... Nov 9 15:21:48 o99 kernel: [ 4350.245171] NET: Unregistered protocol family 15 Nov 9 15:21:48 o99 ipsec_setup: ...Openswan IPsec stopped Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command ipsec setup stop finished with exit code 0 Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Executing command invoke-rc.d xl2tpd stop Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command invoke-rc.d xl2tpd stop finished with exit code 0 Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Opening client connection Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Closing client connection Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Executing command ipsec setup start Nov 9 15:21:48 o99 kernel: [ 4350.312483] NET: Registered protocol family 15 Nov 9 15:21:48 o99 ipsec_setup: Starting Openswan IPsec U2.6.23/K2.6.32-49-generic... Nov 9 15:21:48 o99 ipsec_setup: Using NETKEY(XFRM) stack Nov 9 15:21:48 o99 kernel: [ 4350.410774] Initializing XFRM netlink socket Nov 9 15:21:48 o99 kernel: [ 4350.413601] padlock: VIA PadLock not detected. Nov 9 15:21:48 o99 kernel: [ 4350.427311] padlock: VIA PadLock Hash Engine not detected. Nov 9 15:21:48 o99 kernel: [ 4350.441533] padlock: VIA PadLock not detected. Nov 9 15:21:48 o99 ipsec_setup: ...Openswan IPsec started Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command ipsec setup start finished with exit code 0 Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Executing command invoke-rc.d xl2tpd start Nov 9 15:21:48 o99 ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d Nov 9 15:21:48 o99 pluto: adjusting ipsec.d to /etc/ipsec.d Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command invoke-rc.d xl2tpd start finished with exit code 0 Nov 9 15:21:48 o99 ipsec__plutorun: 002 added connection description "my_vpn_name" Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Executing command ipsec auto --ready Nov 9 15:21:48 o99 ipsec__plutorun: 003 NAT-Traversal: Trying new style NAT-T Nov 9 15:21:48 o99 ipsec__plutorun: 003 NAT-Traversal: ESPINUDP(1) setup failed for new style NAT-T family IPv4 (errno=19) Nov 9 15:21:48 o99 ipsec__plutorun: 003 NAT-Traversal: Trying old style NAT-T Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command ipsec auto --ready finished with exit code 0 Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Executing command ipsec auto --up my_vpn_name Nov 9 15:21:48 o99 L2tpIPsecVpnControlDaemon: Command ipsec auto --up my_vpn_name finished with exit code 0 Nov 9 15:21:49 o99 L2tpIPsecVpnControlDaemon: Closing client connection Can anyone tell me something more about that? Where is the mistake?

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