Cisco ASA 5520 and DHCP relay

Eimantas Zdanevičius eimantas at
Fri Mar 14 11:48:27 UTC 2008

> On the client what is in /etc/resolv.conf? Is it getting created
> by the dhcp client? What dhcp client are you using? dhclient, or
> something else?
I'm using dhclient. /etc/resolv.conf created by dhclient and contains 
only nameserver lines:

these dns servers works correctly for other clients
> What setings do you have in dhcpd.conf for domain name servers?
Linux DHCP server configuration:

default-lease-time  1800;    # 1/2 hour
max-lease-time      3600;    # 1 hour
min-lease-time       900;    # 1/4 hour
one-lease-per-client true;
option arp-cache-timeout 3600;
option netbios-node-type 1;
ddns-update-style none;
ddns-updates off;
subnet netmask {
       option routers        ;
       option subnet-mask    ;
       option domain-name-servers,;
       host asus { fixed-address; hardware ethernet
00:18:f3:3e:bc:3e; }
> If neither of these is helpful, then using tcpdump or wireshark
> to look at the packets on the network may give some clues.
For now i can't test with tcpdumpor wireshark , i wil do this later.

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