[ipv6hackers] Best Network Tap - for home

[Mark ZZZ Smith]

----- Original Message -----
> From: Gert Doering <gert at space.net>
> To: IPv6 Hackers Mailing List <ipv6hackers at lists.si6networks.com>
> Cc: 
> Sent: Friday, 12 July 2013 5:01 AM
> Subject: Re: [ipv6hackers] Best Network Tap - for home
> 
> Hi,
> 
> On Thu, Jul 11, 2013 at 02:33:51AM -0700, Mark ZZZ Smith wrote:
>>  > Pictures at http://www.steffann.nl/sander/tap/. Works great and very 
>>  > inexpensive!
>>  > 
>> 
>>  There is an official GigE cross over wiring, so that technique could 
>>  probably be applied to GigE too. 
> 
> No, as all wires on 1000BaseT are used bidirectionally, and both end
> systems actually negotiate which wires go where.
> 

IEEE 802.3-2008, Section 3:

40.4.4 Automatic MDI/MDI-X Configuration
Automatic MDI/MDI-X Configuration is intended to eliminate the need for crossover cables between simi-
lar devices. Implementation of an automatic MDI/MDI-X configuration is optional for 1000BASE-T
devices. If an automatic configuration method is used, it shall comply with the following specifications. The
assignment of pin-outs for a 1000BASE-T crossover function cable is shown in Table 40–12 in 40.8.

Table 40–12—Assignment of PMA signal to MDI and MDI-X pin-outs
Contact MDI MDI-X
1 BI_DA+ BI_DB+
2 BI_DA– BI_DB–
3 BI_DB+ BI_DA+
4 BI_DC+ BI_DD+
5 BI_DC– BI_DD–
6 BI_DB– BI_DA–
7 BI_DD+ BI_DC+
8 BI_DD– BI_DC–




> Gert Doering
>         -- NetMaster
> -- 
> have you enabled IPv6 on something today...?
> 
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