win2000 server, linux client

[Marco Eyzaguirre]

hello everyone, im new in this list and i have this problem..
 
I have a win2000 domain controller in subnet 172.17.0.x and a linux
server in 172.17.20.x  (DHCP assign) The DC not solve the ip /
netbiosname relation ("A" record i think..) like a win98 / NT /2000
If i "ping" the linux server from outside 172.17.20.x i receive this : 
 
ping 172.17.20.1 --> response
ping dgalinux --> time out (dgalinux is the netbiosname of the linux
server)
 
Is this a problem of samba? i was searching a solution, patch or
something like that, but i found nothing.. i have Redhat linux 8.0 and
Samba 2.2.5
 
Thanks for your help.
 
Marco Eyzaguirre
Lima - Perú
(sorry for my terrible english.. i speak spanish..)