DHCP+ CISCO UBR7200

[Dušan Sýs]

Ahoj,

snazim se rozjet headend pro internet pres kabelove modemy. Jako headend je cisco ubr7200 a modemy bootuji z DHCP. Pokud je dhcp server na ciscu, tak je vse OK. Pokud vsak presmeruji dhcp na linux ( isc dhcp 3.0pl2 ), tak modemy nedostanou IP adresu. V logu dhcp mam jen

DHCPDISCOVER from 00:0f:9f:14:66:98 via eth1
DHCPOFFER on 10.0.0.27 to 00:0f:9f:14:66:98 via eth1
DHCPREQUEST for 10.0.0.33 (10.0.0.100) from 00:0f:9f:14:67:0e via eth1
DHCPACK on 10.0.0.33 to 00:0f:9f:14:67:0e via eth1
DHCPREQUEST for 10.0.0.27 (10.0.0.1)from 00:0f:9f:14:66:98 via eth1
DHCPACK on 10.0.0.27 to 00:0f:9f:14:66:98 via eth1

a konec. Cisco je jako bridge a vse je v jedne podsiti. 

dhcp.conf vypada takto


option domain-name "test.cz"; 
server-name "cable.test.cz"; 
ddns-update-style none;

subnet 10.0.0.0 netmask 255.255.255.0 { 

        range 10.0.0.20 10.0.0.30; 
        option routers 10.0.0.100; 
        option subnet-mask 255.255.255.0; 
        option broadcast-address 10.0.0.255;

        option domain-name-servers 10.0.0.100. 
        next-server 10.0.0.100;
        filename "test.bin";
} 


modemy zustanou ve stavu init(rc) a to podle 
http://www.cisco.com/en/US/tech/tk86/tk168/technologies_tech_note09186a00801494b8.shtml
znamena, ze modem nedostal prvni dhcp paket.


Diky za kazdou pomoc. Uz se s tim trapim vic jak tyden a dochazi mi inspirace.

Zdravi Dusan