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To be honest, I solved it a bit different: by adding ip command to post-boot script.
Something like (by memory):
ip ppp0 mtu=1464
ip ppp1 mtu=1464
PS: Naming command ip was dickhead stupid IMO, as searching for its uses on google etc is a hellish nightmare. There was nothing wrong with ifconfig to begin with, but some love making changes for the sake of changes.