The diagram in my previous email was crook. Here it is again:
ITR1
H1---(BR)-------(TR)-\
/ \
H2--/ (TR)-\
/ \
/ \ Translating
/ \ Tunnel Router
ITR2 / \
H3---(BR)--(TR)---/ (TTR)~~(TR)~~(BR)~~(NAT)~~(MH)
\ /
H4---(RR)-----(TR)------------/
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