Hello everybody.
My system has two network interfaces: main is wired Ethernet and backup is
cellular modem using PPPoS. I want to choose which interface to use by
netifapi_netif_set_default().
The problem I expect that both interfaces got DNS servers addresses from
providers. It is possible that each of interface is connected to each own
subnetwork and each provider has it's own DNS servers in their subnetworks not
accessible from outside of subnetwork. It means that when I use wired Ethernet
interface I should use DNS servers supplied by Internet provider via DHCP and
using cellular modem interface I should use DNS severs supplied by cellular
operator via IPCP. What is correct way to do do such scenario in lwIP?
As far as I understood lwIP architecture, it uses two global (system-wide) DNS
addresses (by default) and each interface overwrites them after getting new
values by DHCP/IPCP. So used DNS addresses depends on which interface got their
DNS addresses last.
--
Regards,
Sergey A. Borshch mailto: [email protected]
SB ELDI ltd. Riga, Latvia
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