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* Over the years the terminology has changed a bit, a "switch" is (in 
1980s/1990s terminology) a "multiport network bridge", and back then such 
devices were a) very very expensive, and b) had very few ports, and ... c) few 
people had a clue what they did (myself included back then).

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<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, =
sans-serif;font-size:16px"><div dir=3D"ltr"><span>I'm a beginner and I gues=
s it is a place for help.</span></div> <div class=3D"qtdSeparateBR"><br><br=
></div><div class=3D"yahoo_quoted" style=3D"display: block;"> <div style=3D=
"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grand=
e, sans-serif; font-size: 16px;"> <div style=3D"font-family: HelveticaNeue,=
 Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16=
px;"> <div dir=3D"ltr"><font size=3D"2" face=3D"Arial"> On Monday, May 9, 2=
016 11:41 AM, Simon Hobson &lt;linux@xxxxxxxxxxxxxxxx&gt; wrote:<br></font>=
</div>  <br><br> <div class=3D"y_msg_container">Just to add, since it seems=
 a common problem getting round some of the concepts ...<br clear=3D"none">=
<br clear=3D"none">Just consider the network if the guest were not virtuali=
sed, but a real machine, and the bridge were a real switch sat on your desk=
top. You'd need a means of configuring the networking on the "guest" (eg st=
atic config or DHCP), and a means of getting it's traffic to-from the outsi=
de world (typically by means of a router).<br clear=3D"none"><br clear=3D"n=
one">Now you are going to take those separate pieces of hardware and roll t=
hem up into a virtualised setup. The switch turns into a virtual switch (a =
bridge* in Linux networking terminology), the computer turns into a virtual=
ised guest, and the router turns into ? At home I run a separate guest as a=
 two port router, but you can put it's functions into the Dom0 config.<br c=
lear=3D"none"><br clear=3D"none">So from the PoV of the guest, it's just co=
nnected to a network switch. Nothing magical changes, and it's IP config is=
 managed in just the same way as the real machine.<br clear=3D"none">From t=
he PoV of the bridge, it's just a network switch with two devices connected=
 (Dom0 and the guest when doing routing/NAT in Dom0).<br clear=3D"none"><br=
 clear=3D"none"><br clear=3D"none">* Over the years the terminology has cha=
nged a bit, a "switch" is (in 1980s/1990s terminology) a "multiport network=
 bridge", and back then such devices were a) very very expensive, and b) ha=
d very few ports, and ... c) few people had a clue what they did (myself in=
cluded back then).<div class=3D"yqt6646129083" id=3D"yqtfd31767"><br clear=
=3D"none"><br clear=3D"none"><br clear=3D"none">___________________________=
____________________<br clear=3D"none">Xen-users mailing list<br clear=3D"n=
one"><a shape=3D"rect" ymailto=3D"mailto:Xen-users@xxxxxxxxxxxxx"; href=3D"m=
ailto:Xen-users@xxxxxxxxxxxxx">Xen-users@xxxxxxxxxxxxx</a><br clear=3D"none=
"><a shape=3D"rect" href=3D"http://lists.xen.org/xen-users"; target=3D"_blan=
k">http://lists.xen.org/xen-users</a></div><br><br></div>  </div> </div>  <=

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