I've got a 7937G that worked beautifully with a Cisco IOS DHCP server and a Brocade/Foundry DHCP server, but has not responded to the first DHCP offer since moving to an ISC DHCP server.
Details:
- all other phones (mix of 7911, 7941, 7961, 7962, etc.) on the same vlan are obtaining leases and working properly.
- multiple physical connections have been attempted to include different ports and cables
- phones are directly connected to a Brocade/Foundry FastIron SuperX (FSX) using dual-mode ports and LLDP-MED for voice vlan configuration
- port connected to the 7937G is in "forwarding" state, negotiated at 100Mbit-FD, and there are no interface errors
- routing interface on voice vlan (ip 10.1.150.1/24) is relaying DHCP to 2 DHCP servers (10.1.40.11, 10.1.40.12)
- attempted a factory reset on the 7937G - no change
- removed old lease attempts, restarted DHCPd multiple times - no change
- ran "tcpdump" on both DHCP servers to watch traffic (excerpt below)
- added "arp-cache-timeout" option (set to 60 seconds) after investigating traffic to make sure all requested DHCP options are provided - no change
tcpdump output:
13:01:10.017531 IP (tos 0x0, ttl 64, id 49197, offset 0, flags [none], proto UDP (17), length 352)
10.1.40.1.0 > 10.1.40.12.bootps: [udp sum ok] BOOTP/DHCP, Request from 00:04:f2:e6:22:6a (oui Unknown), length 324, hops 1, xid 0x4582af64, secs 59662, Flags [Broadcast] (0x8000)
Gateway-IP 10.1.150.1
Client-Ethernet-Address 00:04:f2:e6:22:6a (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Lease-Time Option 51, length 4: 4294967295
Hostname Option 12, length 15: "SEP0004f2e6226a"
Vendor-Class Option 60, length 37: "Cisco Systems, Inc. IP Phone CP-7937G"
Client-ID Option 61, length 7: ether 00:04:f2:e6:22:6a
Parameter-Request Option 55, length 7:
Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
AT, TFTP, Option 150
END Option 255, length 0
13:01:10.018031 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 352)
10.1.40.12.bootps > 10.1.150.1.bootps: [bad udp cksum 0xd36c -> 0x872c!] BOOTP/DHCP, Reply, length 324, hops 1, xid 0x4582af64, secs 59662, Flags [Broadcast] (0x8000)
Your-IP 10.1.150.135
Server-IP 192.168.18.10
Gateway-IP 10.1.150.1
Client-Ethernet-Address 00:04:f2:e6:22:6a (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Offer
Server-ID Option 54, length 4: 10.1.40.12
Lease-Time Option 51, length 4: 3600
Subnet-Mask Option 1, length 4: 255.255.255.0
Default-Gateway Option 3, length 4: 10.1.150.1
Domain-Name-Server Option 6, length 8: 10.1.40.5,10.1.40.6
Domain-Name Option 15, length 23: "****************"
TFTP Option 66, length 13: "192.168.18.10"
T150 Option 150, length 4: 3232240138
END Option 255, length 0
The offer is never "requested", and the phone continues to repeat the "discover" process. Any ideas?
