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Update README.md (#2566)

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@ -257,6 +257,42 @@ FAQ
Detailed explanation: [./docs/programmers_guide/db_faq.md](./docs/programmers_guide/db_faq.md)
### Default Ports and Protocols / Firewalls?
#### `erigon` ports
| Port | Protocol | Purpose | Expose |
|:-----:|:---------:|:----------------:|:-------:|
| 30303 | TCP & UDP | eth/66 peering | Public |
| 30304 | TCP & UDP | eth/65 peering | Public |
| 9090 | TCP | gRPC Connections | Private |
Typically 30303 and 30304 are exposed to the internet to allow incoming peering connections. 9090 is exposed only internally for rpcdaemon or other connections, (e.g. rpcdaemon -> erigon)
#### `rpcdaemon` ports
| Port | Protocol | Purpose | Expose |
|:-----:|:---------:|:-----------------:|:-------:|
| 8545 | TCP | HTTP & WebSockets | Private |
Typically 8545 is exposed only interally for JSON-RPC queries. Both HTTP and WebSocket connections are on the same port.
#### `sentry` ports
| Port | Protocol | Purpose | Expose |
|:-----:|:---------:|:----------------:|:-------:|
| 30303 | TCP & UDP | Peering | Public |
| 9091 | TCP | gRPC Connections | Private |
Typically a sentry process will run one eth/xx protocl (e.g. eth/66) and will be exposed to the internet on 30303. Port 9091 is for internal gRCP connections (e.g erigon -> sentry)
#### Other ports
| Port | Protocol | Purpose | Expose |
|:----:|:--------:|:-------:|:-------:|
| 6060 | TCP | pprof | Private |
| 6060 | TCP | metrics | Private |
Optional flags can be enabled that enable pprof or metrics (or both) - however, they both run on 6060 by default, so you'll have to change one if you want to run both at the same time. use `--help` with the binary for more info.
Also, ports 9092 and 9093 are reserved for future use of the consensus engine and shapshot downloader for gRPC (work in progress).
Getting in touch
================
@ -346,4 +382,3 @@ non-batched way.
### Filesystem's background features are expensive
For example: btrfs's autodefrag option - may increase write IO 100x times