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[lwip-devel] [bug #55252] Gratuitous ARP sent before valid ip address is
From: |
Pelle Bergkvist |
Subject: |
[lwip-devel] [bug #55252] Gratuitous ARP sent before valid ip address is obtained |
Date: |
Thu, 20 Dec 2018 02:06:54 -0500 (EST) |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134 |
URL:
<https://savannah.nongnu.org/bugs/?55252>
Summary: Gratuitous ARP sent before valid ip address is
obtained
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: pellebk
Submitted on: Thu 20 Dec 2018 07:06:52 AM UTC
Category: ARP
Severity: 3 - Normal
Item Group: Faulty Behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
lwIP version: 2.1.1
_______________________________________________________
Details:
In netif_set_link_up an etharp_gratuitous is done even if the interface
address is IPADDR_ANY. Suggest to change the etharp_gratuitous define to:
#define etharp_gratuitous(netif) if (!ip4_addr_isany(netif_ip4_addr(netif))) {
etharp_request((netif), netif_ip4_addr(netif)); }
as this should not ever(?) be done for IPADDR_ANY
Alternative solution could be to update the if statement in
netif_set_link_up(struct netif *) to
/* For Ethernet network interfaces, we would like to send a "gratuitous
ARP" */
if (((netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_POINTTOPOINT)) ==
NETIF_FLAG_ETHARP) && !ip4_addr_isany(netif_ip4_addr(netif))) {
etharp_gratuitous(netif);
}
Using the latest 2.1.2 version
_______________________________________________________
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