<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>The expense of the fiber is probably out weighed by the costs of getting any cable between the floors. <br></span></div><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Josef Grosch <jgrosch@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Rick Moen <rick@linuxmafia.com> <br><b><span style="font-weight: bold;">Cc:</span></b> conspire@linuxmafia.com <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, January 21, 2014 5:02 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [conspire] (forw) Re: Need help with a
couple technical questions<br> </font> </div> <div class="y_msg_container"><br><meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv647756106"><div dir="ltr"><div><div>Rick,<br><br></div>I have a little experience wiring multi-story condos and, yes, it is basically impossible to do anything with out buy in from the building management. They tend to be territorial about such things. Aside from that, rather then running CAT5/CAT6 long distances I would recommend running fiber optic between the floors and then CAT5/CAT6 to wire the building floor. Yeah, I know fiber is bloody expensive but it gets around the problems of long Ethernet runs. <br>
<br><br></div>Josef<br><br></div><div class="yiv647756106gmail_extra"><br><br><div class="yiv647756106gmail_quote">On Tue, Jan 21, 2014 at 4:49 PM, Rick Moen <span dir="ltr"><<a rel="nofollow" ymailto="mailto:rick@linuxmafia.com" target="_blank" href="mailto:rick@linuxmafia.com">rick@linuxmafia.com</a>></span> wrote:<br>
<blockquote class="yiv647756106gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">----- Forwarded message from Rick Moen <<a rel="nofollow" ymailto="mailto:rick@linuxmafia.com" target="_blank" href="mailto:rick@linuxmafia.com">rick@linuxmafia.com</a>> -----<br>
<br>
Date: Tue, 21 Jan 2014 16:49:27 -0800<br>
From: Rick Moen <<a rel="nofollow" ymailto="mailto:rick@linuxmafia.com" target="_blank" href="mailto:rick@linuxmafia.com">rick@linuxmafia.com</a>><br>
To: Jennifer Chao <<a rel="nofollow" ymailto="mailto:chlinlin66@gmail.com" target="_blank" href="mailto:chlinlin66@gmail.com">chlinlin66@gmail.com</a>><br>
Subject: Re: Need help with a couple technical questions<br>
Organization: If you lived here, you'd be $HOME already.<br>
<br>
Quoting Jennifer Chao (<a rel="nofollow" ymailto="mailto:chlinlin66@gmail.com" target="_blank" href="mailto:chlinlin66@gmail.com">chlinlin66@gmail.com</a>):<br>
<br>
> Hi Rick,<br>
><br>
> Happy New Year!<br>
><br>
> If you have a few minutes to help me find a solution to a couple tech<br>
> questions would be great!<br>
><br>
> 1, How would you go about adding 10x IPs to eth0 in Linux and Windows?<br>
><br>
> 2, How to connect a computer on the first floor to the network switch on<br>
> the 15th floor. Distance is more than 400 ft?<br>
><br>
> Thank you very much for reading my email.<br>
<br>
Happy new year to you too, Jennifer. (Greetings from Bora Bora, French<br>
Polynesia.)<br>
<br>
You add additional IP addresses to a network interface in Linux using a<br>
technique called IP aliasing. Here is a good tutorial:<br>
<a rel="nofollow" target="_blank" href="http://www.cyberciti.biz/faq/linux-creating-or-adding-new-network-alias-to-a-network-card-nic/">http://www.cyberciti.biz/faq/linux-creating-or-adding-new-network-alias-to-a-network-card-nic/</a><br>
<br>
As to MS-Windows, sorry, I am not an MS-Windows information resource.<br>
<br>
The problem of network-connecting across 15 floors of a high-rise<br>
building is a challenging one. Your question does not state whether<br>
this effort can/will be assisted by building management, which is<br>
unfortunate, as the answer to that question opens up or closes off<br>
important options.<br>
<br>
As you probably know, a single run of 100Base-T ethernet cabling overt<br>
CAT6 cabling is rated for only about 300 feet. However, old-style<br>
10Base-2 coaxial 50 ohm ethernet cabling (called 'thinnet') can run for<br>
600 feet (about 185 metres), and also is markedly more resistent to RFI<br>
interference.[1] So, for example, it is often used in office buildings to<br>
connect between floors when the cabling must run near power cabling or<br>
near elevator motors.<br>
<br>
It would be difficult (effectively impossible) to run such a connection<br>
vertically up 14 floors without participation from building management.<br>
If (as seems likely) no such cooperation is available, you might be best<br>
advised to try a point-to-point 802.11 wireless link with directional<br>
antennas and see if you can receive enough signal at each end.<br>
Unfortunately, transmitting through the middle of a solid building is a<br>
very challenging use-case; the more-promising use cases involve links<br>
between buildings where the antennas have line-of-sight communication.<br>
<br>
[1] Transceivers to convert between coax ethernet and modern<br>
twisted-pair ethernet are dirt-cheap at surplus outlets such as Halted<br>
and Weird Stuff.<br>
<br>
<br>
----- End forwarded message -----<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Are you hip to Easter Island ?<br> - PFunk
</div>
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