The telnet and socket interface for each backend must be different on that backend host. These ports are open in the Linux firewall setting by default.
| Backend Host | Backend | socket interface | telnet interface |
|---|---|---|---|
| Primary Backend (PBE) | DB | 2000 | 2001 |
| Additional Backend #1 (ABE) | DB1 | 2100 | 2101 |
| DB2 | 2200 | 2201 | |
| DB3 | 2300 | 2301 | |
| DB4 | 2400 | 2401 | |
| Additional Backend #2 (ABE) | DB-hostname-1 | 2100 | 2101 |
| DB-hostname-2 | 2200 | 2201 | |
| DB-hostname-3 | 2300 | 2301 | |
| DB-hostname-4 | 2400 | 2401 | |
| Additional Backend #3 (ABE) | DB-hostname-1 | 2100 | 2101 |
| DB-hostname-2 | 2200 | 2201 | |
| DB-hostname-3 | 2300 | 2301 | |
| DB-hostname-4 | 2400 | 2401 | |
| Additional Backend #4 (ABE) | DB-hostname-1 | 2100 | 2101 |
| DB-hostname-2 | 2200 | 2201 | |
| DB-hostname-3 | 2300 | 2301 | |
| DB-hostname-4 | 2400 | 2401 | |
| Additional Backend #5 (ABE) | DB-hostname-1 | 2100 | 2101 |
| DB-hostname-2 | 2200 | 2201 | |
| DB-hostname-3 | 2300 | 2301 | |
| DB-hostname-4 | 2400 | 2401 | |
| Additional Backend #6 (ABE) | DB-hostname-1 | 2100 | 2101 |
| DB-hostname-2 | 2200 | 2201 | |
| DB-hostname-3 | 2300 | 2301 | |
| DB-hostname-4 | 2400 | 2401 |
