Запускаем dhcpd на двух интерфейсах

# cat /etc/conf.linuxconf
[dhcpd]
DHCP.interface eth1 eth2

Имеем результат

# service dhcpd restart
Shutting down dhcpd:                                                                                                                 [  OK  ]
Removing host route we defined at startup: SIOCDELRT: No such process
                                                                                                                                     [FAILED]
Starting dhcpd:                                                                                                                      [  OK  ]
Adding local broadcast host route: Usage: inet_route [-vF] del {-host|-net} Target[/prefix] [gw Gw] [metric M] [[dev] If]
       inet_route [-vF] add {-host|-net} Target[/prefix] [gw Gw] [metric M]
                              [netmask N] [mss Mss] [window W] [irtt I]
                              [mod] [dyn] [reinstate] [[dev] If]
       inet_route [-vF] add {-host|-net} Target[/prefix] [metric M] reject
       inet_route [-FC] flush      NOT supported
                                                                                                                                     [FAILED]


Ошиюка судя по всему в /etc/rc.d/init.d/dhcpd
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