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Hi. I've never posted to this list, but here goes.
I have discovered a problem with ISC DHCPD 1.0.2. It appears that if the
default route of the machine running dhcpd is changed while dhcpd is
running, some dhcp responses (like DHCPACK) are sent to the new default
route instead of the existing ethernet.
I discovered this problem on one of my servers. Every three to four
weeks, the dhcpd would stop working. It seems that the system's pppd
would die, then get restarted by a monitoring script I wrote. When pppd
reconnected, dhcpd stops working.
When this condition occurs, I see messages like these in my syslogs:
(addresses changed to protect the innocent)
May 14 17:09:11 jade kernel: Packet log: input REJECT ppp0 PROTO=17
ZZ.YY.XX.WW:67 255.255.255.255:68 L=355 S=0x00 I=45185 F=0x0000 T=64
Which is definitely being send from the dhcpd over the newly-upped ppp0
interface. It gets caught because that system is also the network border
router and has ingress filtering rules applied.
I also see:
May 14 17:09:11 jade dhcpd: DHCPDISCOVER from 00:a0:cc:28:39:6a via
eth0
May 14 17:09:11 jade dhcpd: DHCPOFFER on CC.VV.BB.NN to
00:a0:cc:28:39:6a via eth0
So the dhcpd DHCPACK message is getting sent over the ppp0 interface
instead of eth0.
Anyone know if this is fixed in a newer version?
I have only experienced this on one system. It is a PII-450, 128MB ram,
with Debian Linux 2.2, Linux kernel 2.2.5, and dhcpd 1.0.2
--
+-------------------------------------------------------------------------+
| Ian Eure
<[EMAIL PROTECTED]> |
| Network Administrator, Cross Sound Appraisal
Company |
|
|
| "Believe it or not, there's more to being a sysadmin than
rabid |
| technophilia." --Annalee Newitz, "Invisible
Heroes" |
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