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DHCP no allocation possible with multiple DHCP leases on ATM

 
 
HangaS
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      07-16-2009
Hi,

I have a weired problem that is getting me frustrated.

I have a 2811 with 2 ADSL HWICs, each connected to an ADSL line from
the same ISP.
These connections were working independenltly on different Cisco 877s
with no problems

Now I'm trying to merge both this lines into a single 2811 but I can
only get on the connections to work at a time.
Eventually after a very loong time both interfaces get an address.

My line of thought was, the router must be sending the same client ID
to the ISP through both lines, as both lines are identical and to the
same ISP, maybe the DHCP server gets confused by getting two different
requests from the same client ID with different MACs, so i add the 'ip
dhcp client client-id ' and 'ip dhcp client hostname' options to each
interface, but with no success.

Any clues on how can I circumvent this annoying issue?

gw-cbr-1#sh version
Cisco IOS Software, 2800 Software (C2800NM-ADVSECURITYK9-M), Version
12.4(15)T7, RELEASE SOFTWARE (fc3)

Cisco 2811 (revision 53.50) with 247808K/14336K bytes of memory.
Processor board ID FCZ131870N7
2 FastEthernet interfaces
2 ATM interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)


and this my relevant setup:


interface ATM0/0/0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no ip mroute-cache
no atm ilmi-keepalive
dsl operating-mode adsl2+
!
interface ATM0/0/0.1 point-to-point
description ADSL ID: 1
bridge-group 1
pvc 0/35
encapsulation aal5snap
!
!
interface ATM0/1/0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no ip mroute-cache
no atm ilmi-keepalive
dsl operating-mode adsl2+
!
interface ATM0/1/0.1 point-to-point
description ADSL ID: 2
bridge-group 2
pvc 0/35
encapsulation aal5snap
!
[...]
bridge irb

bridge 1 protocol ieee
bridge 1 route ip

bridge 2 protocol ieee
bridge 2 route ip
[...]
!
interface BVI1
ip dhcp client client-id ascii ADSLID18479442
ip dhcp client hostname GW1
ip address dhcp
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly
ip route-cache flow
!
interface BVI2
ip dhcp client client-id ascii ADSLID128904105
ip dhcp client hostname GW2
ip address dhcp
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly
ip route-cache flow


There are no ACLs or policies now, I started from scratch and I just
want to solve the connectivity problem first.


kind regards
 
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