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• What is the best server or Ip address to use for prolonged testing?

  - by eldorel

  I usually run uptime/latency tests against (and from) two servers that we own at different sites and until recently I've used the google dns servers as a control group. However, I've realized there is a potential problem with monitoring latency over extended periods of time. Almost all of the major service providers are using ANYCAST. For short tests this doesn't matter, but I need to run a set of tests for at least a week to try and catch an intermittent problem, and a change in the anycast priority while trying to test latency will cause the latency values for that server to change accordingly. Since I'm submitting graphs of this data to the ISP, I need to avoid/account for as many variables as possible. Spikes in the data for only one of the tested servers will only cause headaches. So can anyone recommend servers that: are not using anycast are owned by an entity that has a good uptime reputation (so they can't claim that the problem is server-side) will respond to ICMP requests Have an available service that runs on TCP/UDP (http or dns preferably) Wont consider an automated request every 10 minutes to be abuse Are accessible from anywhere in the world Are not local to the isp ( consider this an investigation of a hostile party ) Thanks in advance. Edit: added #6 and #7 above. More info: I am attempting to demonstrate a network problem for an entire node of our local ISP's network. They are actively blaming the issue on the equipment installed at the customer sites (our backup site is one of these), and refuse to escalate the problem. (even though 2 of these businesses have ISP provided modems, and all of us have completely different routers/services running) I am already quite familiar with the need to test an isp controlled IP, but they are actively dropping all packets targeted at gateway ip addresses and are only passing traffic addressed beyond the gateways. So to demonstrate the issue, I am sending packets to other systems in the same node, systems one hop away from the affected node, and systems completely outside the network. Unfortunately, all of the systems I have currently are either administered directly by myself, or by people who are biased enough to assist me. I need to have several systems included in the trace/log/graphs that are 100% not in the control of either myself or the isp so that the graphs have a stable/unbiased control group. These requirements are straight from legal, I'm just trying to make sure that everything that could be argued to invalidate the data is already covered. In Summary: I need to be able to show tcp/udp/icmp as 3 separate data points, and I need to be able to show the connections inside the local node, from local node to another nearby node, from those 2 nodes to the internet, and through the internet to both verifiable servers and a control group that I have no control over whatsoever. Again, Google/opendns/yahoo/msn/facebook/etc all use anycast, which throws the numbers off every time the anycast caches expire, so I need suggestions of an IP or server that is available for this type of testing. I was hoping someone knew of a system run by someone such as ISC or ICANN, or perhaps even a .gov server (fcc or nsa maybe?) setup for this type of testing. Thanks again.

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• Squid: how to block websites for a particular IP address?

  - by Kumar P

  How to block websites for particular IPs by squid? Please give solution with example or configuration file.

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• Virtualizing an Inline network appliance with VirtualBox (or VMWare)

  - by Tzury Bar Yochay

  My device, which is a Linux based IP in-liner is transparent to the network peripherals, that is, no IP address assigned to any of its interfaces. For the sake of the conversation, let's use ADSL connection as an example, while the device is inspecting the bi-directional traffic, the network is behaving same as if device was not there, attached to the wire (see Physical setup at the attached diagram). I wonder if I can enclosed that "device" within a Windows machine and have it operated virtually so it still seats inline between the ADSL router and the Windows netwroking interface by using virtual NICs, (or whatever their name is in windows), and inspecting the traffic, same as if it was on a separate physical device, the drawing under "Virtual Setup" in the attached diagram show what I am trying to achieve. Reading a bit on the VirtualBox docs, seems like binding the right side is relatively simple, perhaps I should have one network adapter set as Bridge Networking and VirtualBox will connect it to the physical NIC on the host machine, and network packets are exchanged directly, circumventing the host operating system's network stack (WinXP in my case). However, I have no idea how to achieve the left side of my diagram, which requires adding virtual NICs to windows and configure them correctly in a way to make that pipeline possible. I would appreciate any help. by the way, if that is not possible with VirtualBox but with other virtualization solution (e.g. VMWare), I would accept the other as well.

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• Why can't I access my website with domain? It works with IP address only

  - by Logan

  In the past we didn't have a proper domain name for our site, now I have registered a proper domain name, but now I experiance the following problem: If I go to https://46.144.46.214/ita I can access the portal without any problem; If I go to https://ita.telvent-netherlands.com/ita I receive a time-out in Internet Explorer. But if I go to https://ita.telvent-netherlands.com/ I see that I reach the IIS server so the DNS is working. Do you know how it is possible that I can reach it by IP and not by name? I need to reach it by domain. Thank you in advance.

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• Correct use of SMTP "Sender" header?

  - by Eric Rath

  Our web application sends email messages to people when someone posts new content. Both sender and recipient have opted into receiving email messages from our application. When preparing such a message, we set the following SMTP headers: FROM: [email protected] TO: [email protected] SENDER: [email protected] We chose to use the author's email address in the FROM header in an attempt to provide the best experience for the recipient; when they see the message in their mail client, the author is clear. To avoid the appearance of spoofing, we added the SENDER header (with our own company email address) to make it clear that we sent the message on the author's behalf. After reading RFCs 822 and 2822, this seems to be an intended use of the sender header. Most receiving mail servers seem to handle this well; the email message is delivered normally (assuming the recipient mailbox exists, is not over quota, etc). However, when sending a message FROM an address in a domain TO an address in the same domain, some receiving domains reject the messages with a response like: 571 incorrect IP - psmtp (in reply to RCPT TO command) I think this means the receiving server only saw that the FROM header address was in its own domain, and that the message originated from a server it didn't consider authorized to send messages for that domain. In other words, the receiving server ignored the SENDER header. We have a workaround in place: the webapp keeps a list of such domains that seem to ignore the SENDER header, and when the FROM and TO headers are both in such a domain, it sets the FROM header to our own email address instead. But this list requires maintenance. Is there a better way to achieve the desired experience? We'd like to be a "good citizen" of the net, and all parties involved -- senders and recipients -- want to participate and receive these messages. One alternative is to always use our company email address in the FROM header, and prepend the author's name/address to the subject, but this seems a little clumsy.

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• How do I mount an external USB hard drive on my Sheevaplug?

  - by James

  I've acquired a Sheevaplug running - I think - Ubuntu. I'd like to mount an external USB hard drive, but I don't know the name of the device that needs mounting. When I list the devices under /dev, a long list is produced. How do I find out which device listed needs to be mounted? Update: When I run dmesg after plugging the device in, I see the following at the end: usb 1-1: new high speed USB device using ehci_marvell and address 6 usb 1-1: device not accepting address 6, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 7 usb 1-1: device not accepting address 7, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 8 usb 1-1: device not accepting address 8, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 9 usb 1-1: device not accepting address 9, error -71 And when I view /var/log/messages, I can see this: Sep 23 21:26:03 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:04 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:05 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:05 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Unfortunately, I don't know what these mean.

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• Powershell script to delete secondary SMTP addresses of Exchange 2010 Mail Contacts

  - by Zero Subnet

  I have a few thousand Exchange 2010 Mail Contacts who get erroneously assigned internal SMTP addresses by the default recipient policy. I'm trying to use the following command to delete these addresses (keeping the primary SMTP) and disabling the automatic update from recipient policy so the SMTP addresses don't get recreated again. Get-MailContact -OrganizationalUnit "domain.local/OU" -Filter {EmailAddresses -like *@domain.local -and name -notlike "ExchangeUM*"} -ResultSize unlimited -IgnoreDefaultScope | foreach {$contact = $_; $email = $contact.emailaddresses; $email | foreach {if ($_.smtpaddress -like *@domain.local) {$address = $_.smtpaddress; write-host "Removing address" $address "from Contact" $contact.name; Set-Mailcontact -Identity $contact.identity -EmailAddresses @{Remove=$address}; $contact | set-mailcontact -emailaddresspolicyenabled $false} }} I'm getting the following error though: You must provide a value expression on the right-hand side of the '-like' operator. At line:1 char:312 + Get-MailContact -OrganizationalUnit "domain.local/testou" -Filter {EmailAddresses -like "@domain.local" -and name -notlike "ExchangeUM"} -ResultSize unlimited -IgnoreDefaultScope | foreach {$contact = $; $ email = $contact.emailaddresses; $email | foreach {if ($.smtpaddress -like <<<< *@domain.local) {$address = $_.smt paddress; write-host "Removing address" $address "from Contact" $contact.name; Set-Mailcontact -Identity $contact.ident ity -EmailAddresses @{Remove=$address}; $contact }} + CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException + FullyQualifiedErrorId : ExpectedValueExpression Any help as to how to fix this?

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• how long does noip ddns takes to make the updated address again accessible?

  - by neoDev

  Yesterday I've created a noip account, I've downloaded the updater client (DUC), I've configured them, and when I've tryied to browse "myaddress.noip.me" all worked fine... When my WAN IP changes, the DUC client quickly updates it in few minutes, and in my account on noip.com I can see that it is also refreshed properly. But the problem is that if I try to browse "myaddress.noip.me" after that update, the page does not load... "Unable to connect to myaddress.noip.me" After 6-7 hours it becomes again accessible, but I'm not sure if this is normal... I think this is too much time... Please help

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• How do I limit the users a specific user can run commands in linux?

  - by user8571

  I have 2 user accounts, foo and bar I want to allow user foo to execute commands as root and any other user ie: sudo su root -c'./run-my-script' sudo su bar -c'./another-script' sudo su another -c'./yet-another-script I also want to allow user bar to execute commands as other user but only a subset and not root ie: sudo su bar -c'./run-my-script' but not sudo su root -c'./run-my-script' Is this possible ?

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• Thin web server - single or multiple instances per IP address:port?

  - by wchrisjohnson

  I'm deploying a rack/sinatra/web socket app onto several servers and will use thin as the web server (http://code.macournoyer.com/thin/). There are almost no views to show, so I am not front-ending it with a traditional web server like Apache or nginx. In general, you see thin started and the underlying config file for it has the number of server instances to start, say 3, and the port to start with, say 5000. So, in my example, when thin starts, it starts up three instances on a range of ports, starting on port 5000. If I have a series of virtual machines, say 3, 6, 9, etc. that I treat as a cluster, would/should I choose to start a single thin instance on each VM, or multiple instances on each VM? Why? Thanks - Chris

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• Correct use of SMTP "Sender" header?

  - by Eric Rath

  Our web application sends email messages to people when someone posts new content. Both sender and recipient have opted into receiving email messages from our application. When preparing such a message, we set the following SMTP headers: FROM: [email protected] TO: [email protected] SENDER: [email protected] We chose to use the author's email address in the FROM header in an attempt to provide the best experience for the recipient; when they see the message in their mail client, the author is clear. To avoid the appearance of spoofing, we added the SENDER header (with our own company email address) to make it clear that we sent the message on the author's behalf. After reading RFCs 822 and 2822, this seems to be an intended use of the sender header. Most receiving mail servers seem to handle this well; the email message is delivered normally (assuming the recipient mailbox exists, is not over quota, etc). However, when sending a message FROM an address in a domain TO an address in the same domain, some receiving domains reject the messages with a response like: 571 incorrect IP - psmtp (in reply to RCPT TO command) I think this means the receiving server only saw that the FROM header address was in its own domain, and that the message originated from a server it didn't consider authorized to send messages for that domain. In other words, the receiving server ignored the SENDER header. We have a workaround in place: the webapp keeps a list of such domains that seem to ignore the SENDER header, and when the FROM and TO headers are both in such a domain, it sets the FROM header to our own email address instead. But this list requires maintenance. Is there a better way to achieve the desired experience? We'd like to be a "good citizen" of the net, and all parties involved -- senders and recipients -- want to participate and receive these messages. One alternative is to always use our company email address in the FROM header, and prepend the author's name/address to the subject, but this seems a little clumsy.

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• How faster is using an internal IP address instead of an external one?

  - by user349603

  I have a mailing list application that sends emails through several dedicated SMTP servers (running Linux Debian 5 and Postfix) in the same network of a hosting company. However, the application is using the servers' external IP addresses in order to connect to them over SMTP, and I was wondering what kind of improvement would be obtained if the application used the internal IP addresses of the servers instead? Thank you in advance for your insight.

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• Sharepoint 2010 reacts very badly to having it's IP address changed. How do I fix it?

  - by Jeff Sacksteder

  I have Sharepoint 2010 set up on a virtual host for prototyping various projects. If I restart the host, the IP changes. Afterwards, SP complains that it can't find it's configuration database. I can't find where it might be storing an IP. To clarify, the URL remains the same - I have a dynamic dns solution in place to handle that. I can't see anything in the web.config files or the database connection strings that would indicate a hardcoded IP. How can I fix this up in less time than re-installing every time I need to do a project?

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• Is there a Linux kernel boot parameter to configure an IPv6 address?

  - by aef

  I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ip=192.0.2.1::192.0.2.62:255.255.255.192::eth0:none I'm looking for an equal parameter for IPv6 configuration. I couldn't find anything about this in the kernel documentations. Update: Because of a lot of you asked why I would need this: The idea to use a kernel configuration came up related to this problem. I suspect the regular boot-up interface configuration is not done, because the interfaces are already up. The reason for this could be that I'm using a pre-boot environment with a Dropbear SSH server to allow me to unlock my encrypted root partition. The IP addresses for this environment are configured through GRUB with the ip= parameter. There is no DHCP or Router Advertisement available on that Ethernet segment and as this is the uplink segment provided by a large hosting company, there is no way to change that fact.

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• Excel: How do I copy hyperlink address from one column of text to another column with different text?

  - by OfficeLackey

  I have a spreadsheet where column A displays names in a certain format. There are 200-odd names and each has a different hyperlink (which links to that person's web page). I want to reformat the name order so it is "Surname, Name" rather than "Name Surname" and retain the hyperlink in the newly formatted column. I have achieved "Surname, Name" easily by splitting the names into two columns (using LEFT and RIGHT formulae) - forename and surname - then I have a new column with a formula to return "Surname, Name." However, the hyperlinks are not in that new column and I need them. I don't want to do this manually, for obvious reasons. I cannot find a way of copying just hyperlinks from column A without copying the text from column A. So, effectively, what I need is some sort of macro to take, for example, the hyperlink from A2 and copy it to H2, with H2 still retaining the updated ordering of name. I don't have the knowledge to write this myself, so would appreciate solutions.

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• what are these weird IP address connections in resource monitor?

  - by bill

  I decided to check out Resource Monitor (on the 'Performance' tab in Task Manager, Windows 7) and I noticed in the "Network" section that the 'System' image name kept making a bunch (~5 at a time) of connections to random IP addresses, it would show anywhere from 1-500 bytes/sec 'sent'. They would stay connected for 1-2 minutes. -All web browsers are closed So, first thing I did was run a trace from network-tools.com on some of these IP addresses. 8/10 were outside of US and did not resolve to any host name. Of the 10 IP addresses I traced, 2 were in US, 4 showed origins in China, and one each to Algeria, Russia, Pakistan, Korea. (!) So, the next thing I did was turn off my wireless card, watch the connections disappear, then turn the card back on, and within 30 seconds more random connections were created by System, with different IP addresses from the first time. The next thing I did was go open Task Manager, Show Processes From All Users, then I killed just about everything that wasn't (what appeared to be) a windows process. Turned on wi-fi, and again within 30 seconds, random IP addresses connect for ~ 1 min at a time, new ones coming and going. I occasionally use bit torrent on this machine, but there was definitely no process that seemed related to bt running after I went through task manager, and bt wasn't open to begin with. So, any ideas on what these connections might be for? I have been using Ad-Aware Free and AVG Free on this computer for a while now, always up to date..

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• How to discover which name/address connections from one network to another uses?

  - by Jader Dias

  In MySQL you have to authorized a user based on the name of the origin network. From my network to a remote one all connections appear as sent from mail.mycompany.com. But connections to another remote network it appears with a different origin. How to discover which name/ip it is using? I tried tcpdump and netstat in the destination but it is difficult to find my connection among billions of others. In my case the destination is a Windows Server 2003

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• How to find full/real email address from Lotus Notes?

  - by DA

  Is there any way to get the full set of email addresses? Example: I receive an email sent to a Lotus group 'all department employees'. I'd like to be able to grab the actual email addresses contained within (not their Lotus user name) so that I could email everyone from a client other than Lotus. Does such an option exist? I believe this was doable in Exchange with a right-click and 'expand nickname' type of action. I'm on a Mac.

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• What are the practical differences between an IP address and a server?

  - by JMC Creative

  My understanding of IPs and other DNS-type server-related issues really falls short (read: exteme noob). I know a dedicated server would increase speed. What, if any, difference in speed would a dedicated IP make? Am I correct in understanding the Best Practices from Yahoo that I could use the second IP to serve up some content, which would increase the number of parallel downloads for the user? Or are both IPs (purchase from same hosting account) going to point to the same server? Or how does it work? Are there other optimization things I should be aware of when thinking of purchasing a dedicated IP? Clarification I am talking about the speed of serving the webpages, i.e. the speed of my website. Yes, I know that IP and server are completely different, not even opposites, just different. But this, indeed, is my question! The Question Reformulated: Will having a second (dedicated) IP on my website speed up the time that it will load and display for the user? Or does that have nothing at all to do with IP, and is only a server issue? I'm sorry if this is still unclear. This is a real question though, I may just not be wording it well.

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• Rewrite new url and block old url in nginx

  - by Howard

  I have a local folder /bar, and I want to be able access via http://www.example.com/foo. So I have the config like rewrite ^/foo/(.*)$ /bar/$1 last; At the same time, I want to block public access to the real url /bar, Then I add the config like location ~* ^/bar{ return 404; } But when I add this url into the config, the 1st config above not work, now both return 404 Anything I should fix in order to make the rewrite work? Thanks.

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• How to BIND IP Address on Centos 5? Need Tutorial

  - by Clear.Cache

  Can someone show me a simplified tutorial that explains how to bind IPs in Linux (Centos / Redhat)? For example, got a dedicated server with a /29 123.123.123.0/29 So I have to bind that /29 where 123.123.123.2 is the IP I'll access via ssh in order to do so. Thanks.

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• Redirect specific e-mail address sent to a user, to another user.

  - by Michael Pasqualone

  I need to redirect e-mail within our MTA when the two following criteria are both true: When an e-mail is: Sent from: [email protected] Addressesd to: [email protected] Result: redirect e-mail to [email protected]. I don't want to catch *@isp.com and redirect, and I don't want to redirect all e-mail addressed to [email protected] but only redirect when [email protected] sends [email protected] an e-mail. How do I achieve this within Postfix's configuration. And if it's not possible within Postfix, what may be the best solution?

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• Change "From" email address when sending to a specific domain.

  - by RB

  Hi, I would like to set up Exchange so that when a user (e.g. [email protected]) sends an email to somedomain.com Exchange makes the email appear to have come from [email protected]. This would have to be done on a per-domain basis, and invisibly to the user. So all emails come from [email protected], except emails to somedomain.com, which appear to come from [email protected]. If anyone has any ideas I would really appreciate it. Cheers, RB.

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• Is there a good way to prevent a server from emailing a specific address (we control both servers/apps)?

  - by Bms85smb

  When testing a production app we occasionally need to pull from a live site and perform tests on a development server. There are quite a few email addresses stored in the database that we need to modify every time we restore to the development server. Occasionally someone on my team will miss one and accidentally send an email through the distribution list. The email looks legit because it is coming from a clone, it can cause quite the situation. We have a protocol we follow every time we clone the live app and it has helped a lot but I would feel better if it was impossible for the two servers to communicate. Is there a good way to do this? Can firewall rules block email? Does Plesk have a blacklist?

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• Phantomjs creating black output from SVG using page.render

  - by Neil Young

  I have been running PhantomJS 1.9.6 happily on a turnkey Linux server for about 4 months now. Its purpose is to take an SVG file and create different sizes using the page.render function. This has been doing this but since a few days ago has started to generate a black mono output. Please see below: The code: var page = require('webpage').create(), system = require('system'), address, output, ext, width, height; if ( system.args.length !== 4 ) { console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error need address, output, extension arguments\" }"); //console.log('phantomjs.rasterize: error need address, output, extension arguments'); phantom.exit(1); } else if( system.args[3] !== "jpg" && system.args[3] !== "png"){ console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error \"jpg\" or \"png\" only please\" }"); //console.log('phantomjs.rasterize: error "jpg" or "png" only please'); phantom.exit(1); } else { address = system.args[1]; output = system.args[2]; ext = system.args[3]; width = 1044; height = 738; page.viewportSize = { width: width, height: height }; //postcard size page.open(address, function (status) { if (status !== 'success') { console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error loading address ["+address+"]\" }"); //console.log('phantomjs.rasterize: error loading address ['+address+'] '); phantom.exit(); } else { window.setTimeout(function () { //--> redner full size postcard page.render( output + "." + ext ); //--> redner smaller postcard page.zoomFactor = 0.5; page.clipRect = {top:0, left:0, width:width*0.5, height:height*0.5}; page.render( output + ".50." + ext); //--> redner postcard thumb page.zoomFactor = 0.25; page.clipRect = {top:0, left:0, width:width*0.25, height:height*0.25}; page.render( output + ".25." + ext); //--> exit console.log("{ \"result\": true, \"message\": \"phantomjs.rasterize: success ["+address+"]>>["+output+"."+ext+"]\" }"); //console.log('phantomjs.rasterize: success ['+address+']>>['+output+'.'+ext+']'); phantom.exit(); }, 100); } }); } Does anyone know what can be causing this? There have been no server configuration changes that I know of. Many thanks for your help.

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