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Posted by Patrick Schaaf on May 2, 2008, 2:33 am
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>Yes, but not if it used the same MAC on both the WAN and LAN
>ports, as seems to be allowed for IP routers.
On a WAN port, a router often does not use ethernet framing at all.
In these cases no (ethernet) MAC address is used on the WAN port.
best regards
Patrick
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Posted by DLR on May 3, 2008, 7:41 am
Patrick Schaaf wrote:
>
>> Yes, but not if it used the same MAC on both the WAN and LAN
>> ports, as seems to be allowed for IP routers.
>
> On a WAN port, a router often does not use ethernet framing at all.
> In these cases no (ethernet) MAC address is used on the WAN port.
Excuse me?!?!?
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Posted by Steinar Haug on May 3, 2008, 8:28 am
> >> Yes, but not if it used the same MAC on both the WAN and LAN
> >> ports, as seems to be allowed for IP routers.
> > On a WAN port, a router often does not use ethernet framing at all.
> > In these cases no (ethernet) MAC address is used on the WAN port.
>
> Excuse me?!?!?
Read up on (for instance) serial links and PPP encapsulation. No MAC
address is used.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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Posted by glen herrmannsfeldt on May 3, 2008, 11:30 am
Steinar Haug wrote:
>>>>Yes, but not if it used the same MAC on both the WAN and LAN
>>>>ports, as seems to be allowed for IP routers.
>>>On a WAN port, a router often does not use ethernet framing at all.
>>>In these cases no (ethernet) MAC address is used on the WAN port.
>>Excuse me?!?!?
> Read up on (for instance) serial links and PPP encapsulation. No MAC
> address is used.
But for PPPoE, as you might find in a router with wireless
access point, there would be a MAC address. I believe there
are enough home routers using ethernet that 'often' doesn't
apply to serial links anymore. (I presume you mostly mean
the serial links used for T1 connections.)
-- glen
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Posted by jpd on May 3, 2008, 12:09 pm
On Sat, 03 May 2008 07:30:03 -0800,
> Steinar Haug wrote:
>>>>On a WAN port, a router often does not use ethernet framing at all.
>>>>In these cases no (ethernet) MAC address is used on the WAN port.
>
>>>Excuse me?!?!?
>
>> Read up on (for instance) serial links and PPP encapsulation. No MAC
>> address is used.
>
> But for PPPoE, as you might find in a router with wireless
> access point, there would be a MAC address.
You mean, as you use to interface something found in a home with the DSL
modem. The WAN side often ends up being ATM again, and probably doesn't
use ethernet framing. ``Probably'' because this is an educated guess and
I have not looked at what actually comes out on that side of the device.
> I believe there are enough home routers using ethernet that 'often'
> doesn't apply to serial links anymore. (I presume you mostly mean the
> serial links used for T1 connections.)
In sheer numbers, most ``routers'' might be DSL modems fancied up
with some other functionality, but I somehow fail to think of last
mile linkups as Wide Area Networking. T1/E1 indeed don't use ethernet
framing, and neither does plain dialup, but plenty other technologies
also don't (think SONET, etc.) altough you can often enough transport
ethernet frames over those again.
The point was that ethernet MACs are not inherently required for
``networking'', and thus network ports will exist without a MAC address.
Logically, those ports will not be ethernet ports, but that doesn't mean
you can't push packets through them.
--
j p d (at) d s b (dot) t u d e l f t (dot) n l .
This message was originally posted on Usenet in plain text.
Any other representation, additions, or changes do not have my
consent and may be a violation of international copyright law.
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