Please Help routing configuration

[Mohamed Lemine O/ Sidaty]

Hi every body I have the following situation my internet gateway bcm600 has local ip adress 172.16.4.60 another machine called mail wich has 172.16.4.17 as its local ip adress   193.251.145.29 is my domain ip adresse , my provider is 193.251.145.250 i reach it without difficulty with a PPP link as it can be seen in the following route command output :   [root@bcm600 /etc]# route Kernel IP routing table Destination            Gateway         Genmask         Flags Metric Ref    Use Iface bcm600                  *               255.255.255.255    UH    0      0        0 eth0 193.251.145.250    *               255.255.255.255   UH    0      0        0 ppp0 172.16.0.0              *               255.255.0.0          U     0      0        0 eth0 127.0.0.0               *               255.0.0.0               U     0      0        0 lo default         193.251.145.250 0.0.0.0                   UG    0      0        0 ppp0     my named run on the above machine.   here the route command output for the machine mail [root@mail /etc]# route Table de routage IP du noyau Destination     Passerelle      Genmask           Indic Metric Ref    Use Iface 172.16.4.17     *                   255.255.255.255  UH     0       0        0 eth0 193.251.145.0   bcm600          255.255.255.0   UG     0       0        0 eth0 172.16.0.0        *               255.255.0.0     U     0        0        0       eth0 127.0.0.0         *               255.0.0.0       U        0        0        0         lo       My question is how shall i do or add as default route on machine mail to reach 193.251.145.250 (my provider) . and then have outgoing mail trafic routed to my provider . [My problem now is not at sendmail configuration , but ip routing) .   Thanks in advance Sidaty