[j-nsp] Problem with routing FastEthernet

[Alex Kitschkiruk]

Hello All,

Help with juniper junos!!!
I have received on work old M20 (Junos 4.4) there is only 4Port FastEthernet.
I can not adjust a configuration that has earned. With most juniper I
can ping all PC, connected to ports. But here computers each other do
not see.
IP PC1 192.168.1.20 
IP PC2 192.168.1.21 
all computers and ports in one network. Tried different reports,
configurations... Anything...
I something can is simple do not know... I begin
Thank you !!!

version 4.4R3.4;
system {
    host-name Jun;
    syslog {
        user * {
            any emergency;
        }
        file messages {
            any notice;
            authorization info;
        }
    }
}
interfaces {
    fe-1/0/0 {
        unit 0 {
            family inet {
                address 192.168.1.10/24;
            }
        }
    }
    fe-1/0/1 {
        unit 0 {
            family inet {
                address 192.168.1.11/24;
            }
        }
    }
    fe-1/0/2 {
        unit 0 {
            family inet {
                address 192.168.1.12/24;
            }
        }
    }
    fe-1/0/3 {
        unit 0 {
            family inet {
                address 192.168.1.13/24;
            }
        }
    }
    fxp0 {
        disable;
    }
    lo0 {
        unit 0 {
            family inet {
                address 127.0.0.1/32;
            }
        }
    }
}