I wrote something like this in contrib/win32 port (see this port for the full
code):
#if LWIP_NETIF_LINK_CALLBACK
void link_callback(struct netif *netif)
{ if (netif_is_link_up(netif)) {
printf("link_callback==UP\n");
#if LWIP_DHCP
if (netif->dhcp != NULL) {
dhcp_renew(netif);
}
#endif /* LWIP_DHCP */
} else {
printf("link_callback==DOWN\n");
}
}
#endif /* LWIP_NETIF_LINK_CALLBACK */
But, with experience, it's faster and more efficient to replace
"dhcp_renew(netif);" by a "dhcp_stop(netif);dhcp_start(netif);"
----- Original Message -----
From: "Jonathan Larmour" <[EMAIL PROTECTED]>
To: "Mailing list for lwIP users" <[email protected]>
Sent: Wednesday, February 20, 2008 5:13 PM
Subject: Re: [lwip-users] DHCP recovery after network change
Art R. wrote:
> If lwIP has acquired an IP addr by DHCP, and then the connection is switched
> from one network to another (think unplug from one subnet, walk across the
> hall, plug into different subnet), will it be able to release its current IP
> and acquire a new one? I.e., does it have that capability? Some preliminary
> tests we have done have not gone well...
It is meant to, although would not notice until the original DHCP lease
comes up for renewal. Higher level code could detect, for example, link
up/down events and check whether the network has changed.
Jifl
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