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Docs: Add reference for Android CLAT MTU capped to 1472 #429

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tiagogaspar8 opened this issue Dec 7, 2024 · 2 comments
Open

Docs: Add reference for Android CLAT MTU capped to 1472 #429

tiagogaspar8 opened this issue Dec 7, 2024 · 2 comments

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@tiagogaspar8
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Hi all!

I discovered the other day Android CLAT interface gets capped at 1472, this means that when we configure the Maximum MTU in Jool, if we set the value to a number higher than 1472, the CLAT interface stops working.
I don't know if this value adapts to the actual wireless interface MTU, but it was tested with 1500 MTU, and most setups use this value.

Thanks!
@ydahhrk
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ydahhrk commented Dec 10, 2024

Any pointers as to how to reproduce this?

@tiagogaspar8
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Hi @ydahhrk,
Sorry for the delay. This should be reproducible with an Android Device on a NAT64 network with IPv6-only addressing, Android will auto-create the CLAT interface internally and assign it the mentioned MTU.

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@ydahhrk @tiagogaspar8