On Fri, Jul 06, 2007 at 11:36:21AM -0500, Daniel Paape wrote:
> Hello,
>
> I'm running eCos2.1 on a MIPS variant (w/ bsd_tcip) and am having some
> trouble getting the second Ethernet port to configure via DHCP.? Both ports
> are connected to the same switch.? Eth0 has a statically configured
> (10.9.8.188) address while eth1 is set to configure from a DHCP server
> providing 192.168.20.x addresses.? If I reverse the assignments (eth0 DHCP &
> eth1 static) the ports work fine.? I am not calling 'init_all_networks()'
> rather, I call (what I believe to be) the common init code 'cyg_net_init()'
> and then by way of two threads each associated with a specific port, " call
> 'dhcp_config(port)' or 'init_net("ethx", &bootp_data)'.
>
> When the second port attempts DHCP, the DISCOVER packets never make it out
> onto the wire, which I believe is due to the variable 'isbcast' in the
> 'ip_output routine evaluating to zero as a consequence of the RTF_HOST flag
> being set.? It's as if -any- established route interferes with subsequent
> DHCP configuration.
>
> Does anyone have any idea as to what might be occurring?
I think you are right about a route on the other interface causing
problems. Take a look at the state machine and the way it clears out
the routing tables when doing DHCP. It might be better to use
init_all_network interfaces().
Andrew
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