The CastleNet CBV38Z4EN is a cable router used by SFR (previously Numericable) in France to offer triple play services to domestic users. The modem specifications can be downloaded from the CastleNet website.
Both data and voice services work seamlessly with this device. Good voice quality for local and International calls.
The wifi settings can be easily configured to control the security and the access credentials.
Works well with Windows XP, however IPv6 should be disabled on Windows 7 clients. Works well with Android and iOS.
Beware of the Firewall Features settings on this router, which you can change in ‘WAN Network Configuration’, Services:
Low = no port restrictions
Medium = allows the services below
| AIM/ICQ | 5190 | 5190 | TCP |
| DHCPv6 | 546 | 547 | UDP |
| DNS TCP | 53 | 53 | TCP |
| DNS UDP | 53 | 53 | UDP |
| FTP-S | 989 | 990 | TCP |
| HTTP | 80 | 80 | TCP |
| HTTP ALT | 8080 | 8080 | TCP |
| HTTP-S | 443 | 443 | TCP |
| IMAP | 143 | 143 | TCP |
| IMAP-S | 993 | 993 | TCP |
| IPSec NAT-T | 4500 | 4500 | UDP |
| NTP | 123 | 123 | UDP |
| POP3 | 110 | 110 | TCP |
| POP3-S | 995 | 995 | TCP |
| RADIUS | 1812 | 1812 | TCP |
| RADIUS | 1812 | 1812 | UDP |
| SMTP | 25 | 25 | TCP |
| SSH | 22 | 22 | TCP |
| SMTP-S | 465 | 465 | TCP |
| Steam | 1725 | 1725 | UDP |
| Steam Friends | 1200 | 1200 | UDP |
| Telnet-S | 992 | 992 | TCP |
| XBOX Live | 3074 | 3074 | TCP |
| XBOX Live | 3074 | 3074 | UDP |
| World of Warcraft | 3724 | 3724 | TCP |
| World of Warcraft | 3724 | 3724 | UDP |
| Yahoo Messenger | 5050 | 5050 | TCP |
| Port for stb | 8184 | 8184 | TCP |
| Port for stb | 8184 | 8184 | UDP |
| VoWIFI | 500 | 500 | TCP |
| VoWIFI | 500 | 500 | UDP |
| VoWIFI | 4500 | 4500 | TCP |
| VoWIFI | 4500 | 4500 | UDP |
High = allows the services below
| DNS TCP | 53 | 53 | TCP |
| DNS UDP | 53 | 53 | UDP |
| HTTP | 80 | 80 | TCP |
| HTTP-S | 443 | 443 | TCP |
| IMAP-S | 993 | 993 | TCP |
| IPSec NAT-T | 4500 | 4500 | UDP |
| NTP | 123 | 123 | UDP |
| POP3-S | 995 | 995 | TCP |
| SSH | 22 | 22 | TCP |
| SMTP | 25 | 25 | TCP |
| SMTP-S | 465 | 465 | TCP |
| Port for stb | 8184 | 8184 | TCP |
| Port for Stb | 8184 | 8184 | UDP |
| VoWIFI | 500 | 500 | TCP |
| VoWIFI | 500 | 500 | UDP |
| VoWIFI | 4500 | 4500 | TCP |
| VoWIFI | 4500 | 4500 | UDP |
