[FS#3330] ds-lite: too low default MTU

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Mikhail f. Shiryaev (Felixoid) 

Attached to Project - OpenWrt/LEDE Project
Summary - ds-lite: too low default MTU
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on TP-Link Archer C7 v5
 - Software versions of OpenWrt/LEDE release, packages, etc.
OpenWrt 19.07.3 r11063-85e04e9f46 / LuCI openwrt-19.07 branch git-20.136.49537-fb2f363
ds-lite 7-4
 - Steps to reproduce: install system, install ds-lite, the mtu for all dslite connections will be [1280|https://github.com/openwrt/openwrt/blob/master/package/network/ipv6/ds-lite/files/dslite.sh#L66] by default.

Because of it, if a VPN with ipv6 is used over ipv4, it's completely broken.


tun0 w/ ipv6 -> [vpn client -> [dslite with mtu 1280] -> vpn server] -> private network


As far as I see, it should be relatively easy to make default MTU autoconfigurable with parent's MTU-x (where 30 is 30, if I'm right)

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3330

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