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Modify the thrilling "%D is using my IP address %s!" message so that

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it isn't printed if the IP address in question is '0.0.0.0', which is
used by nodes performing DHCP lookup, and so constitute a false
positive as a report of misconfiguration.
This commit is contained in:
Robert Watson 2004-10-12 17:10:40 +00:00
parent 6c67b8b695
commit 00fcf9d12d
1 changed files with 7 additions and 1 deletions
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8
sys/netinet/if_ether.c
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@ -577,7 +577,13 @@ match:
inet_ntoa(isaddr));
goto drop;
}
if (isaddr.s_addr == myaddr.s_addr) {
/*
* Warn if another host is using the same IP address, but only if the
* IP address isn't 0.0.0.0, which is used for DHCP only, in which
* case we suppress the warning to avoid false positive complaints of
* potential misconfiguration.
*/
if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
log(LOG_ERR,
"arp: %*D is using my IP address %s!\n",
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",