From: Scott Vermillion (scott_ccie_list@it-ag.com)
Date: Thu Aug 30 2007 - 23:50:51 ART
LOL Brian, that gives new meaning to the term "loopback interface."
I wish you luck with the NIO_Tap interface approach. I killed a Sunday
trying to make that work or to create Lo1. I was unsuccessful in both
endeavors but I'm really, really new to the Mac world (and Unix is quite
a ways in my past).
I did try you on the IRC but I was out buying more patch cords and a
cable labeler when this hit the list, so I was too late in trying to
catch you. I'll contact you offline with some thoughts/early lessons
learned with the 3560-8PC as the physical switch...
Regards,
Scott
-------- Original Message --------
Subject: RE: OT: Loopbacks on Mac OS X
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
Date: Thu, August 30, 2007 3:22 pm
To: "'Scott Vermillion'" <scott_ccie_list@it-ag.com>
Hi Scott, Two workarounds webve found for the termserv problem is
1) get two more usb nics and plug a crossover cable between them 2)
get one more usb nic and plug a looped back cat5 cable into it. Next
Ibm going to try this with the b NIO_tapb interfaces:
http://7200emu.hacki.at/viewtopic.php?t=3760
http://7200emu.hacki.at/viewtopic.php?t=6&highlight=niotap Also feel
free to join our #ccie IRC channel at irc.internetworkexpert.com or
http://www.internetworkexpert.com/chat/ to discuss your progress on
this with me. Thanks,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com< /p>
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
--------------------------------------------------------------------
From: Scott Vermillion [mailto:scott_ccie_list@it-ag.com]
Sent: Thursday, August 30, 2007 3:35 PM
To: Brian McGahan
Subject: RE: OT: Loopbacks on Mac OS X< font face="Times New Roman"
size="3"> Great, thanks Brian! BTW, other than this little
annoyance, I am pretty much full up and running w/ Mac Mini and 4 x
3560-8PCs. This is SO sweet! I may have to move a cable ever so
often (that pesky SW2 is so danged busy!), but I feel as though I
have a full CCIE R&S rack in my home, at my disposal 24 x 7. I
really appreciate your advice on the Mini and the converter
approach. It's working out really well...
-------- Original Message --------
Subject: RE: OT: Loopbacks on Mac OS X
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
Date: Thu, August 30, 2007 10:35 am
To: "'Scott Vermillion'" <scott_ccie_list@it-ag.com>, "'Cisco
certification'" <ccielab@groupstudy.com>
Scott,
You can add an additional IP address to Loopback0, but this still
won't solve your problem. From the TermServ instance you can talk to
other
devices on the LAN, but not the Mac box itself. It looks to be a
problem in
pcap, which Dynamips uses to interface with the NIC cards. Brian and
I are
working on some workarounds for this for building our new reference
topology
on the mac mini. I'll keep you posted on the progress.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com
Internetwork Exp ert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
Scott Vermillion
Sent: Wednesday, August 29, 2007 11:18 PM
To: Cisco certification
Subject: RE: OT: Loopbacks on Mac OS X
Hi Brian,
I know that I am being really thick here. I should probably just
figure
this out once I get an actual lab going, it all might make a little
more
sense that way. What I am doing is emulating all routers - including
the
TermServ - on the Mac Mini. On a Windows box, you have TermServ E0/0
mapped to the 169.254.0.1 loopback. I tried to do essentially the
same
thing on the Mac but the built-in lo0 is set to 127.0.0.1 and I don't
think I want to change that. So I was just hoping to create an lo1
instead and give it the 169 address. But perhaps this is all silly
and I
shouldn't even bother with this? I can telnet all of the routers sans
TermServ, obviously. I was just trying to keep things as near to the
original topology/configuration as possible. Since I went w/ 3560-8s,
I
already have some deviations. But this is too much effort for very
little gain tha t I can see, now that I've thought it through...
Regards,
Scott
-------- Original Message --------
Subject: Re: OT: Loopbacks on Mac OS X
From: "Brian Dennis" <bdennis@internetworkexpert.com>
Date: Wed, August 29, 2007 9:44 pm
To: "Scott Vermillion" <scott_ccie_list@it-ag.com>, "Cisco
certification" <ccielab@groupstudy.com>
Scott,
If you are going to access the Dynamips server remotely you should
use
the real interface to map the access server's Ethernet interface to.
Also as a side note you may run into issues when trying to get a
Dynamips router to talk to the local NIC that it's mapped to. There
are some solutions (not pretty ;-) if you need to communication
directly between a Dynamips router and your Mac but normally this
isn't
needed unless you are trying to access the terminal server from the
same Mac.
Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
>----- Original Message -----
Subject: OT: Loopbacks on Mac OS X
Date: Wed, August 29, 2007 19:44
From: "Scott Vermillion" <scott_ccie_list@it-ag.com>
> Hi all,
>
> Well, I finally received my 3560-8PCs today! And my Mac Mini is
pretty
> much up and running as I need it. However, I need to create a
loopback
> address for connectivity to the TermServ router in the IEWB
topology. OS
> X ships w/ an lo0, but it's set to 127.0.0.1 and I cannot put the
router
> at 127.0.0.2 (IOS disallows this address). I have tried doing
'ifconfig
> lo1 create blah blah blah' but I'm getting "invalid argument"
errors.
> Anybody have any idea how to create a new loopback interface in OS
X?
>
> Thanks much all,
>
> Scott
>
>
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