micellaneous questions

Lyle Giese lyle at lcrcomputer.net
Mon Jun 29 20:56:26 UTC 2015


Using a little bit of Google magic:

dhcpd listen on one interface

Shows that this may be expected behavior.

Lyle

On 06/29/15 15:44, Leandro wrote:
> Hello guys .... following some questions ...
>
> 1) Even when  DHCPDARGS="eth0" is on dhcpd.conf , Im still seeing 
> dhcpd listening on all interfaces:
> [root at centos86_64 dhcp]# netstat -ulpn
> Active Internet connections (only servers)
> Proto Recv-Q Send-Q Local Address               Foreign 
> Address             State       PID/Program name
> udp        0      0 0.0.0.0:67 0.0.0.0:*                               
> 1207/dhcpd
>
> In fact dhcpd answer for requests coming from other intefaces.
>
> 2)How do I achieve make dhcpd listen on specific interface ?
>
> 3) Is it mandatory to create an empty subnet declaration even for 
> interface that has nothing to do with dhcp service? management 
> interface for instance.
>
> 4)Using Wireshark can not find the gi-addr parameter.
> Is it possible that wireshark shows it as "Relay agent IP addrees" 
> under bootp flags ?
>
> 5)Sniffing  DORA sequence between my dhcpd server and relay agent I 
> founded strange behavior (for me).
> discover is sent from relay wan ip to server ip
> offer is sent from server ip to relay agent lan ip
> request is sent from relay wan ip to server ip
> ack is sent from server to relay agent lan ip.
>
> Is this normal ?
> I was expecting only communication between relay agent wan ip and 
> server ip.
> Now , for this to work I had to add both routes on my server (wan and 
> lan prefixes).
>
> Regards,
> Leandro.
>
>
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