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blockcheck.sh info

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docs/readme.eng.md
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@ -722,6 +722,16 @@ And you can start or stop the demons separately from the firewall:
## Installation
### Checking ISP
Before running zapret you must discover working bypass strategy.
`blockcheck.sh` automates this process. It first checks DNS then tries many strategies finding the working ones.
Note that DNS check is mostly Russia targeted. It checks several pre-defined blocked in Russia domains and
verifies system DNS answers with public DNS answers. Because ISP can block public DNS or redirect any DNS queries
to their servers `blockcheck.sh` also checks that all returned answers are unique. Usually if DNS is blocked
ISP returns single ip for all blocked domains to redirect you to their "access denied" page.
`blockcheck.sh` works in Linux and FreeBSD.
### desktop linux system
Simple install works on most modern linux distributions with systemd or openrc, OpenWRT and MacOS.