Re: What is an "ll header"?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Ed Greshko <ed.greshko@xxxxxxxxxxx> writes:

> On 07/09/14 22:57, lee wrote:
>> Ed Greshko <ed.greshko@xxxxxxxxxxx> writes:
>>
>>> On 07/09/14 19:41, lee wrote:
>>>> what is an "ll header"?
>>>>
>>>> I'm trying to figure out why I have martian sources and got so far as to
>>>> think that they are not created on my side.  Yet the "ll header" might
>>>> contain some useful information if I knew exactly how to interpret that
>>>> information.
>>> ll header stands for "Link Layer Header"
>> Thanks!  What does the information given in it tell me?  It looks like
>> part of it could be a MAC address.
>>
>> How can I find out what causes these messages?
>>
>
> The contents of the link header is dependent on the type of link.  For
> ethernet, the header will simply contain the Destination and Source
> MAC addresses + a code to define the remainder of the packet.  0800
> for IP, 86dd for IPv6, 0806 for ARP.
>
> A martian is detected when the source MAC address has an associated IP
> address not expected on that interface.  This usually means there is a
> misconfigured system on the LAN.

Thanks again!  These packages would appear to be broadcasts from MAC
addresses I don't have.  I'll have to bother my ISP about it.


-- 
Fedora release 20 (Heisenbug)
-- 
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org




[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux