Archive for the Category » netværk «

Monday, October 29th, 2012 | Author:

Det fremgår, at, i uendelig visdom, Google har en sikkerhedsfunktion, der kan blokere et program fra adgang til eller anvende din Google-konto. Jeg kan se, hvordan dette kan være et problem for Googles brugere, især deres GTalk og Gmail brugere. I mit tilfælde var det Pidgin har et problem med Jabber tjeneste (som er teknisk set en del af GTalk). Jeg fandt løsningen efter lidt grave. Jeg blev overrasket over, hvor gammel sagen var, og hvor længe denne funktion har eksisteret!

For at låse konto og få din ansøgning online, bruge Googles Captcha side her.

Del
Thursday, June 03rd, 2010 | Author:

Why I’ve left MTN

So I’ve been shopping around in a non-serious fashion in the last few months trying to figure out how best to leave MTN and how get the best deal for me. I don’t like MTN since I became anirate“, as I might call such a customer in the ISP industry. MTN’s Customer-Service Call Centre had rarely been helpful or knowledgeable on their own systems. The final straw however was when their systems let me screw myself over and Customer Service was as helpful as a dead redshirt:

I had a billing issue where, admittedly, it started of my own fault. MTN has a feature where you can call in to find out the amount owing on your account. Only, as Murphy would have it, this amount was ikke the amount owing on the account but the last amount that was billed.

So one month my account was about R900. I called the number, mis-heard R500, paid the amount I thought I should: R500. 15 days later MTN suspended my account. No wrong done, right? Wrong.

First off, I received no notification of any kind. An sms would make the most sense, especially since it would cost MTN almost no resources: “Your account xyz is in arrears by R400. Please contact blah blah blah”. They could phone me, they could email me, something, but nothing of the sort happened. Suspend without Prejudice. Thats the best way to get the customer’s attention!

Now, not only could I not make calls and sms’s, I could not receive calls or sms’s. Further, I could not even call MTN’s toll free phone number. I had to use someone else’s phone to get to the bottom of the problem. After two days of haggling I finally found a lady kind enough to re-enable the account. Ten days later my salary goes in, I call the same number and hear a number close toR900”. I think to myself maybe I should double-check juuuust in case I mis-heard. I call again, I hear the same number again. Right. Pay the R900. Fifteen days later, my phone is suspended AGAIN. WTH?

Remember what I mentioned earlier?: “this amount was ikke the amount owing on the account but the last amount that was billed.” So, in spite of the fact that the voice prompt specifically saysPress 3 for Balance Due; [Presses 3] ; The Total Outstanding Balance is; Nine; hundred; og; #whatever ; Rands; og; #whatever; cents”, I actually owed them R900 plus the R400 that I’d paid short the previous month. No, I do not know if MTN has fixed this. I no longer care. Since I figured this out I started waiting for paper statements to see how much was actually due. Interestingly, their paper statements were also wrong. Only they had the opposite problem: “This invoice: R1300in spite of the fact that on the next page it says opening balanceR400”, closing balanceR1300”. Pah! Is it fixed? Again, I don’t care.

I let them know I wasn’t renewing the contract and I’ve now already ported my number away to Virgin Mobile. Because I want to keep my number and port it elsewhere, the store said I could not putunsatisfactory serviceas the reason for ending the contract but that it should simply sayporting”. Apparently by putting anything else there they might notnoticethat I want it ported. WTF.

What next? (without MTN)

In my research I’ve found that contractdealsare most popular. Typically, you can get a R8000 phone for R800 per month over 24 months with R500-odd worth of airtime per month. This amounts to you paying R19 200 over a 24-month period for a phone worth R8000 which will be obsolete within 12 måned. You will get some airtime every month so you might feel its not a complete loss. However you should also remember that it costs the cellular companies nothing when you make those phone calls. Profit.

There’s a better way

There are much cheaper contracts, contracts for between R50 and R200 which include cheapish phonesphones that work damned well as a phone but won’t let you play games on the train. Most of these contracts actually give you the same airtime value (sometimes more!) as what you are paying. So for R100 you might get R100 worth of airtime plus some free sms’s, and a cheapish phone. The best deals I’ve seen recently have all been for the Samsung STAR, an understated but good cell phone, available from a number of retailers for between R100 and R200 per month. In most cases the deals have included the full amount of airtime. Virgin Mobile has probably the best example here: The cost is R199 per month which includes R200 in airtime and 1000 sms’s (Ja, you read that rightone thousand!).

Virginal Service All the Way!

Another reason I’ve gone with Virgin Mobile is a little something no other service provider does: AmixedContract/Prepaid facility. I get R200 in airtime however, if I go over that, the extra just gets added to my invoice. With MTN this could go sky high without the option of a limit! With Virgin, because I asked, it has a limit of R300. Dog, I can still add prepaid airtime (with cellphone banking, nogal). No other service provider lets you do this!

Remember that R8000 cell phone I mentioned earlier? My plan is to get the Samsung STAR and spend less than R300 per month. I’ll have saved enough money to actually go and buy a more expensive phone (or laptop) with the cash I’ll have saved! Selvfølgelig, if you actually use that R800-worth of phone calls, I guess the best available deal is where you spend the R19200 anyway. Maybe at least with a more critical view on your choices you’ll save yourself a good amount of money in future. Good luck in your search for your best deal!

Del
Søndag, 26 apr, 2009 | Author:

Tro mig. Vi er stadig beskæftiger sig med regexes – bare i en rundkørsel (og vagt praktisk) vej. Dette er en temmelig omfattende liste over hvordan man skylle DNS cache, mens du bruger regexes at vise, hvor lignende metoder afviger.

Hvorfor ønsker vi at rydde DNS caches præcis?

Der er en række grunde til at rydde DNS caches, selvom jeg tror, ​​at disse er de mest almindelige:

  • En intranet tjeneste har en privspiste (intern) IP-adresse når du er på virksomhedens netværk, men det har en offentlig IP-adresse til udendørs adgang. Når du forsøger at få adgang til denne service fra uden for efter at få adgang til det fra inde, der er en chance for, at du ville have cached den private (utilgængelige) IP. En god langsigtet løsning er at gøre tjeneste umulig undtagen via VPN. En enklere løsning er at forlade arbejdet på arbejdspladsen. 😛
  • En internet service eller hjemmeside ændrer deres DNS-indstillinger og dit skrivebord / laptop ser på “gammel” indstilling. I dette tilfælde, den nye indstilling har ikke endnu formeret. Hosting Admins stødt på dette tilfælde meget ofte.
  • Privacy: Hvis nogen kan spore din DNS historie så ville det ikke være for svært at regne ud, hvilke websteder, du har vist. Selvom de enkelte sider, du har set ikke kan spores på denne måde, de værtsnavne, såsom “dogma.swiftspirit.co.za” eller “google.com” vil være i DNS cache, sandsynligvis i den rækkefølge du først adgang hvert websted. Der er bedre måder at gøre dette selv. Et eksempel er at bruge en Tor netværk for alle DNS-anmodninger.

Flushing Windows’ DNS cache, fra kommandoprompten:

Meget tyder på, at der forud for Windows 2000, Windows OS'er ikke cache DNS resultater. Den ipconfig kommando, løbe fra kommandoprompten, fik en vis kontrol over DNS cache og er forblevet nogenlunde det samme siden.

For at komme til prompt, hvis du bruger Udsigt som ikke-Admin: Start -> Programmer -> Tilbehør -> Højreklik “Kommandoprompt” -> Kør som administrator

Ellers: Start -> Ra -> [cmd ] -> [ OK ]

ipconfig / flushdns

Flush the DNS Resolver Cache in Windows

Det er også muligt at rydde cachen i Windows ved genstarte den “DNS-klient” eller “Dnscache” tjeneste.

Flushing Mac OS X DNS cache, fra shell prompt:

Siden Mac OS X, Æble Macs har kørt en Unix-baserede, POSIX-kompatibel, styresystem baseret på Næste skridt, selv oprindeligt indeholder kode fra FreeBSD og NetBSD. Mac OS X bruger lookupd eller dscacheutil at styre DNS cache, afhængigt af versionen.

For at komme til prompt: Applikationer -> Hjælpeprogrammer -> Terminal

(lookupd|dscacheutil) -flushcache

Hvad har vi her? Som for del 1, den lodret streg indikerer, at enten “lookupd” OR “dscacheutil” er acceptable. Den parentes angiver, at lodret streg gælder kun for “lookupd|dscacheutil” del af udtrykket. Således, den ” -flushcache” ikke er frivillig og skal indgå i kommandoen for at det at arbejde. Bemærk, at disse kommandoer producerer ingen udgang, medmindre der er en fejl.

Brug dscacheutil hvis du bruger Mac OS X 10.5 (Leopard) eller senere.

Mac OS X:

lookupd -flushcache

Mac OS X Leopard:

dscacheutil -flushcache

Use dscacheutil to flush the cache in Mac OS X Leopard

Der er også en GUI værktøj, DNS Højtryksspuler, der bruger automatisk den rigtige kommando til rådighed.

Flushing Linux / Unix’ DNS cache, fra shell prompt:

NB. Hvis du ikke allerede har enten binder (med caching opslag aktiveret), nscd, eller dnsmasq installeret og kører på din * nix-baserede desktop / server, du sandsynligvis ikke cache DNS overhovedet og der er intet til at skylle. In that case you will be utilising your DNS server for every web request, probably slowing your web experience.* If so, I recommend at least installing nscd as it is the easiest to set up. **

Flushing nscd’s cache

As with the Mac OS command, this produces absolutely no output unless there is an error:

(|sudo )(|/usr/sbin/)nscd -i hosts
  • Use sudo if you’re not already root otherwise the first selection is blank.
  • Specify /usr/sbin/ if nscd is not already within thepath”. If your distribution has nscd in a strange place, locate it first:
locate -r bin/nscd$

Notice that the abovebin/nscd$is itself a regular expression. 🙂

Using nscd, invalidate thehostscache, logged in as a user:
sudo nscd -i hosts
Using nscd, invalidate thehostscache, logged in as root:
nscd -i hosts
Using nscd, invalidate thehostscache, logged in as root, specifying the full path:
/usr/sbin/nscd -i hosts

Flushing bind’s cache

To flush bind’s cache, udsteder vi en kommando via rndc. Brug sudo hvis du ikke allerede er root:

(|sudo )rndc flush

Genstart af cacheing tjenester også virker!

Her er hvordan at genstarte en af ​​caching dæmoner:

(|sudo )(tjeneste |/etc /(rc  .D|rc  .D / init  .D|Heat  d)/)(binder|dnsmasq|nscd) genstart

Det er begyndt at få svært ved at læse. *** Heldigvis har jeg forklaret i detaljer:

  • Som med den forrige kommando, bruge sudo hvis du ikke allerede er root.
  • Det andet valg har den første mulighed “tjeneste “. Det gælder først og fremmest til Red Hat / CentOS og Fedora-systemer.
  • Den “/etc /(rc .D|rc .D / init .D|Heat d)/” bør udvides yderligere. Dette er for de fleste andre systemer. Generelt, den rc.d er hvis du bruger en BSD-stil init-system (for eksempel: Arch Linux, FreeBSD, eller OpenBSD). Den bedste måde at vide med sikkerhed, hvilken kommando for at bruge er at "lokalisere’ den korrekte nscd eller dnsmasq path. De fleste Unix-varianter, selv Solaris, bruge nscd:
locate -r \.d/nscd$ ; locate -r \.d/dnsmasq$ ; locate -r \.d/rndc$
  • The last choice is between “binder”, “nscd”, og “dnsmasq”. This depends entirely on which is installed and in use.
  • The last of the pattern, ” genstart”, is the instruction given to the daemon’s control script.

Arch, using dnsmasq, restarting the cache daemon, logged in as root:

/etc/rc.d/dnsmasq restart

Arch, using nscd, restarting the cache daemon, logged in as user:

sudo /etc/rc.d/nscd restart

CentOS / Red Hat, using nscd, restarting the daemon, as root:

service nscd restart

nscdrestart

Flush Mozilla Firefox’s internal DNS cache:

Mozilla Firefox keeps its own DNS cache for performance. Firefox 2 would cache only 20 entries for up to 60 seconds. The default setting as of Firefox 3 appears to be 512 entries for up to 60 minutes which seems much more reasonable for every-day browsing. If your desktop has a built-in cache (which most now do) then the cache here is actually redundant. Jeg er ikke bekendt med andre browsere, der gennemfører DNS caching.

Jeg har fundet et par løsninger til når du har brug for at rydde cachen. Det synes der er mange måder at gøre dette men disse er den nemmeste, som jeg har lagt i prioriteret rækkefølge.:

  1. Installer Firefox DNS Højtryksspuler Addon – Giver en knap til at skylle cache.
  2. Installer DNS Cache Addon – giver en toggle som deaktiverer eller aktiverer DNS cache.
  3. Ryd cache (rydder browserens cache samt DNS Cache): Vælg TREDSKABER -> Ryd Private data; Fravælg alle afkrydsningsfelter undtagen Caat; Klik [ Fjern private oplysninger nu ].
  4. Gøre manuelt hvad DNS Cache gør: indstille følgende 2 cirka:config optioner “network.dnsCacheExpiration” og “network.dnsCacheEntries” til 0 og derefter tilbage til standard.

Jeg havde en dårlig cached rekord og jeg ryddet min browsers cache. Men dens stadig giver mig den forkerte info. Hvad giver?

På grund af hvordan DNS formering værker, du helst behov for at tømme DNS på alle DNS værter mellem dig selv og “authoritive” vært, begyndende med værten nærmest authoritive vært (længst væk fra din browser).

Som et eksempel, hvis du har en router, der caching DNS, nulstille routeren cache, før du genstarter DNS cache dit operativsystem, og kun derefter skal du rydde cachen i Firefox. Årsagen er, at selvom du kun rydde din OS og Firefox 'caches, skrivebordet stadig vil bede routeren for sin dårlig record alligevel.

Hvad hvis min DNS-server er en server på nettet uden for min kontrol?

Du kunne prøve midlertidigt at bruge en anden navneserver, måske endda en offentligt åbne server. OpenDNS viser nogle gode oplysninger om, hvordan dette. Hvis du gerne vil, bør du også kunne få relevante oplysninger fra din egen internetudbyder om deres løsning af DNS-servere. En lokal eksempel (Sydafrika) er Saix hvilken lister deres løsning af DNS-servere.

* Sandsynligvis grunden Firefox har en DNS cache indbygget ****
** “((Pacman|yoghurt) -S|dukke|(yum|fitness|apt-get) installere) nscd” og derefter sikre, at tilføjes service til startup scripts. Se din distributions installation dokumentation.
*** Jeg leder efter en syntaksfremhævning plugin, der kan arbejde med regex
**** Jeg har læst udtalelser om, at genstart nettet(ING|) tjenesten rydder også DNS ​​cache men jeg har ikke set nogen dokumentation for, at dette er sandt. Hvis nogen har et eksempel, hvor dette er sandt, venligst give mig med detaljer.
Del
Søndag, April 19th, 2009 | Author:

I think the Internet is a scary place. Ja, me. Some days I find myself horrified to find the lowliest of criminal bastards trying to steal our livelihoods.

Ja, people, there are criminals out there and they want your money or they want to use you to make money. What’s even more scary is the lengths to which they are willing to go, even risking YOU. Do not pass Go. Do not collect $200.

I received an email saying that I was being offered a job as aRegional Assistant” og, though the details weren’t given, the email suggested that it was a legitimate opportunity. I replied asking about where they’d received my details and also about what they would require of me.

Being the skeptic I am, I thought I could spot scammers a mile away. How fortunate that I can still laugh at the idea.

A few hours later, they replied indicating that I’d soon receive further instructions. They’dprobablybeen referred to me by a friend and they had a pile of referrals and so couldn’t specify which friend had recommended me. I waited patiently and left it to the back of my mind. “They’ve probably found a good candidate already and I’ve lost out”, I thought. “How nice that a friend might refer me. Obviously I’m Awesome.” (and daft :-/)

So later on, I receive my email with myfurther instructions”. This is where I finally realised that I was dealing with scammers:

Der. We’d like to start a trial task. Our customer will make a bank transfer to you this week. Please go to our site <site omitted> to submit the banking details where the transfer will go to. Once we’ve established a good transaction history, you will receive between 2-3 transfers per week (amounts of about R10 000 each except the first trial transfers).
Please confirm that you can start. We don’t send any transfers to your account until we receive confirmation from you.
On Monday you will receive notification, detailed information and instructions regarding the transfers. Thank you and have a lovely weekend.

Say what??? I checked out the web site in question and, without a doubt, this is a money laundering scheme done by professionals. They know what they’re doing and they probably launder millions every month. What’s more is that, inevitably, they will screw you over and get the cops to arrest YOU. These criminals can leave evidence behind implicating you even if all you’ve done is diligently moved money from one place to anotherand kept a small percentage for yourself. 😛

Money laundering is where illegitimate money (stolen, probably) is transferred via third parties to appear more legitimate. You’re an accessory to the crime and, even worse, you’re even likely to be the victim of it. Recognise when an opportunity is too good to be true. I was fooled for a short while. Next up, given that a victim might give out a lot of personal details, the scammers might steal your identity and start to implicate you in fraudulent activities without you ever having done a thing.

If you happen to have already given any details such as the above where they wanted my banking details, contact your bank and inform them of the situation. They will give you the best possible advice on what to do next. If you’ve already responded to the mail but haven’t yet already given them the information they want, don’t reply any further. I’d also suggest calling your local police for further advice.

Del
Tuesday, March 31st, 2009 | Author:

For those who don’t yet know what its about!

[youtube]http://www.youtube.com/watch?v=ddO9idmax0o[/youtube]

And then we get to make fun of it too!

[youtube]http://www.youtube.com/watch?v=PN2HAroA12w[/youtube]

Oh ‘n I figured out how to add videos painlessly. W00T

Del