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August 2012

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From:
Clint Bowman <[log in to unmask]>
Reply To:
Clint Bowman <[log in to unmask]>
Date:
Mon, 27 Aug 2012 15:38:52 -0700
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man ifconfig

/MTU

mtu N  This parameter sets the Maximum Transfer Unit (MTU) of an 
interface.


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On Mon, 27 Aug 2012, Todd And Margo Chester wrote:

> On 08/27/2012 03:16 PM, jdow wrote:
>> On 2012/08/27 14:37, Todd And Margo Chester wrote:
>>> On 08/27/2012 01:57 PM, Carl Friedberg wrote:
>>> 
>>>>> -----Original Message-----
>>>>> From: [log in to unmask] [mailto:owner-
>>>>> [log in to unmask]] On Behalf Of Todd And Margo
>>>>> Chester
>>>>> Sent: Monday, August 27, 2012 4:49 PM
>>>>> To: Scientific Linux Users
>>>>> Subject: jumbo frames?
>>>>> 
>>>>> Hi All,
>>>>> 
>>>>> Can anyone tell me what this means?
>>>>>
>>>>>       just disable jumbo frames on centos host interface
>>>>>       ifcfg and ethernet switch.
>>>>> 
>>>>> Many thanks,
>>>>> -T
>>>> 
>>>
>>>  > Todd and Margo Chester:
>>>  >
>>>  >   I can give you some information.
>>>  >
>>>  > jumbo frames refer to a capability to send very large packets
>>>  > over gigabit Ethernet (somewhere near 9,000 bytes), as
>>>  > opposed to the traditional ~1500 byte packet size on
>>>  > traditional Ethernet.
>>>  >
>>>  > This only works between two end-points if every switch
>>>  > handling the frame/packet has jumbo frame capability
>>>  > enabled.
>>>  >
>>>  > There have been instances (I've run into them, but not
>>>  > on SL) where enabling jumbo frames can cause issues.
>>>  >
>>>  > So, since you didn't provide context on that piece of
>>>  > advice,  I can't guess why they were suggesting
>>>  > disabling jumbo frames.
>>>  >
>>>  > Typically, jumbo frames are disabled by default (but,
>>>  > I don't know what the SL policy is).
>>>  >
>>>  > Carl
>>>  >
>>>  > Carl Friedberg
>>>  > www.about.me/carl.friedberg
>>>  > [log in to unmask]
>>>  > www.comets.com
>>>  > Problems Solved
>>>  >
>>>  >
>>> 
>>> Where would I go to check on this?  Is there a utility?
>>> 
>> 
>> ifconfig comes to mind.
>> {^_^}
>> 
>
> $ ifconfig virbr0
> virbr0    Link encap:Ethernet  HWaddr 52:54:00:EB:2D:7B
>          inet addr:192.168.122.1  Bcast:192.168.122.255 Mask:255.255.255.0
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>
> What am I looking for?
>

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