On 15/09/05, Sylvain Falardeau <[EMAIL PROTECTED]> wrote: > Hi, > > I am currently testing dhcping 1.2 on OpenBSD 3.5 and have some problems > to get it to work on the same machine (works fine when dhcpinging other > machines). The dhcpd is on the machine on interface em0 IP 172.21.50.41. > I do: > > # dhcping -v -c 172.21.50.41 -s 172.21.50.41 -h 00:D0:59:83:A0:62 > > > And I got: no answer. > > When I sniff with tcpdump -n -i em0... I see nothing!!! If I do tpcdump > -n -i lo0... I see the dhcp request coming but no answer (the dhcpd is > configured for em0 only). > > 1. Is this normal that OpenBSD send the packet through lo0 when I use > an IP address of another interface? > > 2. Is there a way to make it recognised by dhcpd to be coming from em0? > > I thought it was special packet crafting it this case that was the problem but > I tried with nc (netcat) with a source address of em0 and got the same thing: > it pass through lo0 with 172.21.50.41 address. > > Thanks for your help. > > > Sylvain Falardeau > >
This seemed familiar so I had a look in TCP/IP Illustrated, and heres what I found: "Anything sent to one of the host's own IP addresses is sent to the loopback interface." So, this, I believe is intended. -- Adam Gleave [ OpenBSD 3.7-stable (GENERIC) #1: Sat Jul 23 08:28:45 GMT 2005 ] -- Adam Gleave [ OpenBSD 3.7-stable (GENERIC) #1: Sat Jul 23 08:28:45 GMT 2005 ]
