[plug] Powerware 9120 UPS with ConnectUPS-BD Web/SNMP Card - DHCP no ACK

[Tim]

I have recently received 2 older UPS's. Both Powerware 9120 with
ConnectUPS-BD Web/SNMP Cards. The UPS's just needed a little work (new
fan) and of course the batteries don't last as long as they once did.
The only problem is, I can't get them to talk to my computer. I first
tried static setup (supposed to be an ip address of 192.168.7.18) but
couldn't get in. Then I realised that although the dip switches had
been set for static, it must have been overwritten in the config as I
was seeing DHCP requests. So I moved on to attempting DHCP. I already
have a DHCP server, so was wondering why I again couldn't talk to it.
It appears that after the DHCPOFFER, the UPS doesn't reply and the
cycle starts again a little latter. a DHCPDISCOVER, answered with a
DHCPOFFER, then silence. I thought maybe that the card I was trying
was faulty, so attempted with the next UPS I had. Same thing.

A tcpdump[1] (filtered by the MAC address of the UPS) reveals very
little happening, DHCPDISCOVER, replied with DHCPOFFER and then
nothing.
The UPS's we replaced them with (APC's I think), have a special mode
that only replies to special "Magic Cookies" in the DHCP replies. I
couldn't find anything about a similar system with these old ones. The
manuals just say to change the dip switches for DHCP mode, which I've
done.

I have tried both dhcpd3 and dnsmasq and the results are the same.
Even using my modem as a DHCP server has the same result.

Any ideas? Anyone had to use one of these and can tell me the magic tricks?

Tim

[1]
15:50:10.103337 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto
ICMP (1), length 48)
    sara-linux.local > 192.168.7.28: ICMP echo request, id 48086, seq
0, length 28
15:50:10.103415 IP (tos 0x0, ttl 64, id 385, offset 0, flags [none],
proto UDP (17), length 335)
    sara-linux.local.bootps > 192.168.7.28.bootpc: [udp sum ok]
BOOTP/DHCP, Reply, length 307, xid 0x3b010000, secs 22898, Flags
[none] (0x0000)
	  Your-IP 192.168.7.28
	  Server-IP sara-linux.local
	  Client-Ethernet-Address 00:e0:d8:11:12:86 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: sara-linux.local
	    Lease-Time Option 51, length 4: 3600
	    RN Option 58, length 4: 1800
	    RB Option 59, length 4: 3150
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    BR Option 28, length 4: 192.168.7.255
	    Domain-Name-Server Option 6, length 4: sara-linux.local
	    Domain-Name Option 15, length 13: "purewhite.lan"
	    Default-Gateway Option 3, length 4: 192.168.8.1
15:50:15.107510 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.7.28 tell sara-linux.local, length 28
15:50:16.107501 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.7.28 tell sara-linux.local, length 28
15:50:17.107496 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
192.168.7.28 tell sara-linux.local, length 28
15:51:07.852701 IP (tos 0x0, ttl 200, id 25, offset 0, flags [none],
proto UDP (17), length 576)
    0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP,
Request from 00:e0:d8:11:12:86 (oui Unknown), length 548, xid
0x3c010000, secs 38258, Flags [none] (0x0000)
	  Client-Ethernet-Address 00:e0:d8:11:12:86 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    MSZ Option 57, length 2: 576
15:51:10.106597 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto
ICMP (1), length 48)
    sara-linux.local > 192.168.7.28: ICMP echo request, id 839, seq 0, length 28
15:51:10.106679 IP (tos 0x0, ttl 64, id 386, offset 0, flags [none],
proto UDP (17), length 335)
    sara-linux.local.bootps > 192.168.7.28.bootpc: [udp sum ok]
BOOTP/DHCP, Reply, length 307, xid 0x3c010000, secs 38258, Flags
[none] (0x0000)
	  Your-IP 192.168.7.28
	  Server-IP sara-linux.local
	  Client-Ethernet-Address 00:e0:d8:11:12:86 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: sara-linux.local
	    Lease-Time Option 51, length 4: 3600
	    RN Option 58, length 4: 1800
	    RB Option 59, length 4: 3150
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    BR Option 28, length 4: 192.168.7.255
	    Domain-Name-Server Option 6, length 4: sara-linux.local
	    Domain-Name Option 15, length 13: "purewhite.lan"
	    Default-Gateway Option 3, length 4: 192.168.8.1


-- 
Timothy White - Somewhere in Australia