While receiving a public IP address, the following ports are blocked:
| Port | Direction of Blocking | Common Port Use |
|---|---|---|
| 0 | Both Outbound and Inbound | Reserved |
| 17 | Inbound | Quote of the Day (QOTD) |
| 19 | Inbound | Character Generator Protocol (CHARDEN) |
| 25 | Outbound | |
| 67 | Both Outbound and Inbound | DHCP |
| 135 to 139 | Both Outbound and Inbound | NetBios |
| 445 | Outbound | SMB |
| 520 | Inbound | RIP |
| 546 to 547 | Both Outbound and Inbound | DHCPv6 |
| 1900 | Inbound | SSDP |
| 11211 | Inbound | Memcached |
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