is it possible to let two nodes in different LAN directly connected with another public server ?

[Zhang Jun]

pc1(LANa)  ----poor connection ----> VPS  <--------- PC2(LANb)

pc1 and pc2 used to connected directly with tinc, since pc1 used to have
WAN IP(pppoe),
but the pppoe IP is not WAN IP anymore (ISP changed to let all ADSL user in
a LAN).

if I let the two pc connect to a VPS with tinc,
can later connections between pc1 and pc2 be directly ?
for example, ssh from pc1 to pc2 but not proxyed by VPS.
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