nanog mailing list archives
RE: [Fwd:] Nvidia NICs with duplicate mac addresses
From: "Robert D. Scott" <robert () ufl edu>
Date: Fri, 5 Sep 2008 11:01:53 -0400
Does this MAC present itself all the time, or just during boot? Marvel makes a NIC prevalent in some Dell systems, that presents MAC 0c00.0000.0000 during its startup process. If you run port security, and several people boot their computer within the cam table expiration period, port security will disable the port. You can work around it but it is time consuming in large networks where port security are enabled. Robert D. Scott Robert () ufl edu Senior Network Engineer 352-273-0113 Phone CNS - Network Services 352-392-2061 CNS Receptionist University of Florida 352-392-9440 FAX Florida Lambda Rail 352-294-3571 FLR NOC Gainesville, FL 32611 321-663-0421 Cell -----Original Message----- From: Robert E. Seastrom [mailto:rs () seastrom com] Sent: Friday, September 05, 2008 10:33 AM To: nanog () nanog org Subject: [Fwd:] Nvidia NICs with duplicate mac addresses Forwarded to NANOG in the interests of wider awareness... having been there and torn out my already scarce hair, duplicate MAC addresses can really mess up your day... --- Just when you thought this couldn't happen any more... Copying from a different email list... mac address 04:4b:80:80:80:03, was showing up in multiple places across the network. I googled the mac address and discovered that other people are having the same issue with this mac address. Below are some links describing the problem: http://forums.nvidia.com/index.php?showtopic=22148 http://www.nvnews.net/vbulletin/archive/index.php/t-73469.html I just wanted everyone to know about this problem in case you run across similar slow "connectivity" issues. I believe the network card is made by NVIDIA.
Current thread:
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses, (continued)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jay R. Ashworth (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Kevin Oberman (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jay R. Ashworth (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Kevin Oberman (Sep 05)
- RE: [Fwd:] Nvidia NICs with duplicate mac addresses Scott Berkman (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Kevin Oberman (Sep 05)
- RE: [Fwd:] Nvidia NICs with duplicate mac addresses Eric Tow (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses bmanning (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jim Shankland (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Paul Wall (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Kevin Oberman (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Christopher LILJENSTOLPE (Sep 08)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jay R. Ashworth (Sep 05)
- RE: [Fwd:] Nvidia NICs with duplicate mac addresses Robert D. Scott (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jon Kibler (Sep 05)
- RE: [Fwd:] Nvidia NICs with duplicate mac addresses Robert D. Scott (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Jon Kibler (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses David W. Hankins (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Robert E. Seastrom (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses David W. Hankins (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Robert E. Seastrom (Sep 05)
- Re: [Fwd:] Nvidia NICs with duplicate mac addresses Alec Berry (Sep 05)