PIX 515 DHCP Problem

bretcollins — Fri, 21 Feb 2020 08:53:54 GMT

We have a PIX 515 at a remote office. It is connected to a cable modem. We had a VPN up and running with no problems. The cable company did an upgrade and now the PIX will not get a DHCP address from the cable modem.

I have talked to them multiple times and they are telling me that it is a problem with our PIX. Before the upgrade we had a "sticky IP" so we always got the same IP address. They changed their entire IP scheme and I am thinking they have a reservation on their DHCP server that is no longer valid.

If I connect a broadband router to the cable modem and the PIX then the PIX will pick up an address from the router (192.168.x.x) but I need the PIX to have a public address. If I connect a PC to the cable modem the PC gets an public address, which is why they are telling me it is my PIX.

I ran debug dhcpc detail and this a sample from the output

DHCP get addr: existing ip lease str = 0xecec6c

DHCP: new ip lease str = 0xdd5194packet

DHCP client msg received, fip=10.8.x.x, fport=67

DHCP: Received a BOOTREP pkt Not for us..: xid: 0x1124

DHCP client msg received, fip=10.8.x.x, fport=67

DHCP: Received a BOOTREP pkt Not for us..: xid: 0x1124

DHCP: QScan: Purging entry

DHCP: deleting entry dd4e54 0.0.0.0 from list

Temp IP addr: 0.0.0.0 for peer on Interface: unknown

Temp sub net mask: 0.0.0.0

DHCP Lease server: 0.0.0.0, state: 8 Purging

DHCP transaction id: 0x114A1

Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs

No timer running

Retry count: 0 Client-ID:

DHCP: SDiscover attempt # 2 for entry:

Temp IP addr: 0.0.0.0 for peer on Interface: outside

Temp sub net mask: 0.0.0.0

DHCP Lease server: 0.0.0.0, state: 1 Selecting

DHCP transaction id: 0x20D04

Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs

Next timer fires after: 2 seconds

Retry count: 2 Client-ID: cisco-0013.mmmm.mmmm-outside

DHCP: SDiscover: sending 278 byte length DHCP packet

DHCP: SDiscover 278 bytes

DHCP Broadcast to 255.255.255.255 from 0.0.0.0

DHCP: SDiscover attempt # 3 for entry:

Temp IP addr: 0.0.0.0 for peer on Interface: outside

Temp sub net mask: 0.0.0.0

DHCP Lease server: 0.0.0.0, state: 1 Selecting

DHCP transaction id: 0x20D04

Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs

Next timer fires after: 2 seconds

Retry count: 3 Client-ID: cisco-0013.mmmm.mmmm-outside

DHCP: SDiscover: sending 278 byte length DHCP packet

DHCP: SDiscover 278 bytes

DHCP Broadcast to 255.255.255.255 from 0.0.0.0

DHCP: QScan: Timed out Selecting state

DHCP: QScan: Purging entry

DHCP: deleting entry eceacc 0.0.0.0 from list

Temp IP addr: 0.0.0.0 for peer on Interface: unknown

Temp sub net mask: 0.0.0.0

DHCP Lease server: 0.0.0.0, state: 8 Purging

DHCP transaction id: 0x15EF1

Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs

No timer running

Retry count: 0 Client-ID:

I have changed their DHCP server's IP and the MAC address of the PIX. The PIX seems to be getting an DHCP offer but it says "not for us". Any ideas?

Re: PIX 515 DHCP Problem

Patrick Laidlaw — Fri, 12 May 2006 15:48:37 GMT

This very same issues has happened to me for my test 515. I can not get it to lease a dhcp address from my cable modem provider. It leases an ip address from just about any other type of dhcp server just not off my cable modem.

CABLE MODEM---->Netgear switch/hub---->outisde DHCP 515--LAN

Patrick

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PIX 515 DHCP Problem

Re: PIX 515 DHCP Problem