[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [lwip-users] DHCP recovery after network change
From: |
Frédéric BERNON |
Subject: |
Re: [lwip-users] DHCP recovery after network change |
Date: |
Wed, 20 Feb 2008 22:08:40 +0100 |
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 -----
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
--
eCosCentric Limited
http://www.eCosCentric.com/ The eCos experts
Barnwell House, Barnwell
Drive, Cambridge, UK. Tel: +44 1223
245571
Registered in England and Wales: Reg No 4422071.
Visit us @
Embedded World 2008, Nürnberg, Germany, 26-28 Feb:Stand 11-336
------["Si
fractum non sit, noli id reficere"]------
Opinions==mine
_______________________________________________
lwip-users
mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/lwip-users