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MTU calculation bug.
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Topic: MTU calculation bug. (Read 3639 times)
jljb66
Newbie
Posts: 25
Karma: 2
MTU calculation bug.
«
on:
July 11, 2018, 03:09:04 pm »
This is not a huge issue however when you setup a pppoe connection the default value of the MTU is 1500 and opnsense has a calculation value of 1492.
ie:
Calculated PPP MTU: 1492
The issue is that if you set the mtu to 1492 and click apply, the system comes back with a different calculated value of 1484. The value continues to go down as you choose the newer calculated value. I have set mine a 1492 and have ignored the calculated value. I don't believe this harms the WAN interface but I just thought I would mention it.
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franco
Administrator
Hero Member
Posts: 17656
Karma: 1610
Re: MTU calculation bug.
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Reply #1 on:
July 11, 2018, 04:06:37 pm »
The PPPoE header is 8 bytes long. If you keep decreasing the physical MTU the effective MTU keeps decreasing with it...
Cheers,
Franco
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MTU calculation bug.
