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MTU setting 9000 - only ping -l 8980 works

NIC, network controllers, compatibility questions, WOL, wake on lan
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drnicolas
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MTU setting 9000 - only ping -l 8980 works

#1

Post by drnicolas »

I changed MTU setting to 9000 and rebooted.

Now, tests with ping -f -l 8972 work; -l 8973 does not work anymore.

Is this a problem ?
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b0ssman
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MTU setting 9000 - only ping -l 8980 works

#2

Post by b0ssman »

Don't forget about the ip header. It needs a few bytes as well


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drnicolas
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Re: MTU setting 9000 - only ping -l 8980 works

#3

Post by drnicolas »

THank you for your answer!

Is the MTU setting 9000 correct or should I enter something like 9014.

Some where else I found that MTU 9000 is actually 9014
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Re: MTU setting 9000 - only ping -l 8980 works

#4

Post by raulfg3 »

To answer, you must say what is the Max. MTU supported by your NIC ( and the exact ref. to your NIC).

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drnicolas
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Re: MTU setting 9000 - only ping -l 8980 works

#5

Post by drnicolas »

NIC is an INtel Gigabit NIC.
The on-board NIC seems to support only 6000
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Re: MTU setting 9000 - only ping -l 8980 works

#6

Post by b0ssman »

all the components in the network must support this. even the switch
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Re: MTU setting 9000 - only ping -l 8980 works

#7

Post by Lee Sharp »

Most things top out at 9000. RealTek and some Broadcoms top out at 6000. Very few managed switches stop at 6000, and most will support 9000. No, you do not want to go "over" 9000.

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Re: MTU setting 9000 - only ping -l 8980 works

#8

Post by Onichan »

For one if you are using windows to ping then it's ping does NOT include the IP/ICMP overhead, which is 28 bytes. Since 8972 works I'm going to guess you're using windows and your MTU is set to 9000 and working.

Also most Intel NIC's I have seen actually top out at 9014 bytes.

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Re: MTU setting 9000 - only ping -l 8980 works

#9

Post by drnicolas »

Okay, then my setting 9000 seems to be right.
Thank you
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