How does overseas data go to it's location?

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PaulZA

314 posts

Ultimate Geek
+1 received by user: 10

#97661 19-Feb-2012 15:06

Hi guys, I was wondering how my data reaches it's destination overseas and what route it takes.
I orignally thought, that all my data originating for offshore goes via the SX cable to the USA and then from there to it's destination. I was just wondering, I'm using a VPN Based in Switzerland atm. If the data doesn't go from NZ via Australia, and then on to Asia, and then onto Europe. Instead of going through the USA.

Not that it matters, I'm just very curious.

Thanks

kyhwana2

2572 posts

Uber Geek
+1 received by user: 233

#583449 19-Feb-2012 15:23

Short version: Magic.

Longer version: All depends on what transit your ISP buys and where that goes. For the most part, most NZ ISPs will buy transit to AU (via SXC) and then transit to the US.
So if you want to get to Tokyo, it'll go up to the US then across the pacific to Japan.

There doesn't seem to much transit to europe via asia at the moment. I'm sure there are cost/bandwidth issues there..

DonGould

3892 posts

Uber Geek
+1 received by user: 164

#583502 19-Feb-2012 18:01

Why does it go via .au when SCX heads to .us from akl.nz?

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kyhwana2

2572 posts

Uber Geek
+1 received by user: 233

#583512 19-Feb-2012 18:26

DonGould: Why does it go via .au when SCX heads to .us from akl.nz?

I think the OP is asking why it doesn't go via asia? Instead of going via asia it's going via the US.

michaeln

238 posts

Master Geek
+1 received by user: 44

Trusted

#583875 20-Feb-2012 13:55

Depending on your ISP, their transit provider---or providers, ultimate destination, time of day, traffic load, sunspot activity, cable-seeking trawlers, hacker cabals, fat-fingered operators, etc. etc...

...your packet gets to Auckland and either heads West toward Australia or North East towards Hawaii.

From Australia:

North into Asia, or possibly
West towards Africa.

From Hawaii:

West to Japan
East to Los Angeles

From Los Angeles, off into the America hinterland (including North & South America) or over East and thence to Europe.

Or, as already answered... "magic".

Note that the ISP has surprisingly little it can do to determine the forward path, and even less control over the return path.

Basically, packet forwarding, which is to say "the Internet", depends on the random kindness of strangers. And that is a good thing.

webwat

2036 posts

Uber Geek
+1 received by user: 145

Trusted

#584098 20-Feb-2012 18:44

DonGould: Why does it go via .au when SCX heads to .us from akl.nz?

One side goes from Whenuapai to Sydney, and other side from Takapuna to Hawaii (unless I'm mixed up) but your ISP may choose to route some data to/through Oz and some directly to San Jose. Really depends on where and how they buy their bandwidth. Either way, the most efficient way to get data to Europe will be via USA, so a VPN to europe is relatively inefficient with high latency compared to a VPN to the states or ozzy.

Time to find a new industry!