Not knowing the "specifics" it is difficult to suggest a specific solution. Here is a knowledge base on the topic of Habra block bypass RKN:
Program guide type of blocking sites from PR...
* Knowledge of the type of lock that helps to find optimal solution around it.
Investigation of the mechanism of blocking of sites "... rotelec
Transparent bypass locks on a home network
Offline way to bypass DPI and effective way to ...
Configuring BGP to bypass the lock, or "I ne...
Mikrotik soul vs soulless ILV and such...well
Bypass locks ILV with DNSTap and BGP
- Rostelecom already uses DPI to block
, so you need to watch methods against him.
- Cut VPN port number and type of packages they don't have - violated all corporate remote offices. Can only block access to certain VPN providers. But nobody forbids to rent a server on Amazon and raise the VPN through it.
PS: As always on habré - the most interesting is not the article, and the comments to it.
PPS: a magic link
with the addition of site:habr.com
at the end - gives 99% of answers to any technical questions.