[c-nsp] bridgeing /dhcp problems

[Steven Lamb]

I am new to this forum and not very seasoned with Cisco equip. I am the 
Systems Admin of a small Iowa ISP we have recently had to had the capability 
of OC3 to our network so that we can carry enough bandwidth. for this 
purpose we purchased a Cisco 7120 OC3  Router off of eBay. the equipment 
seems to work as best I can tell. It is currently running version 12.3 of 
the IOS. More info available in the Config that I have also posted.

here is what I have going on currently on our network.

we have one rack of servers connected to a hub as well as 2 Cisco routers 
( a 2620 and the new7120) currently the 2620 will handle all of the outbound 
traffic until we can switch people over to the new Router.

here is the scenario I am having problems with. The teleco I work with has I 
believe a teliant 5000 that they are handing off to me via fiber a point to 
point vc which carries a single DSL customer. I take that vc on a sub 
interface of my OC3 interface which is in a bridge group. when the OC3 was 
the only interface in the bridge group I was unable to ping the rest of my 
router from the DSL modem, so I added the FE port to the bridge this allows 
a statically assigned machine off of the modem to ping and get to the rest 
of the world. however the problem I am running into is when they try to 
DHCP. some times I get a quick response from my DHCP server and some times I 
get a slow response 2+ min. also regardless of how long it takes for the 
DHCP to come back sometimes the modem will not know how to get out to the 
rest of the world. I don't really know what to check or change to resolve 
these two problems. what info other than the config would be useful to see?


oatbran#show running-config
Building configuration...

Current configuration : 2365 bytes
!
version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname oatbran
!
boot-start-marker
boot-end-marker
!
enable secret 5
enable password
!
username root password 0
no aaa new-model
ip subnet-zero
!
!
ip domain name adiis.net
ip name-server 207.177.36.1
ip name-server 207.177.36.2
!
ip multicast-routing
ip cef
ip audit po max-events 100
no ftp-server write-enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
bridge irb
!
!
interface Loopback1
 no ip address
!
interface FastEthernet0/0
 no ip address
 no ip route-cache cef
 no ip route-cache
 duplex full
 speed auto
 bridge-group 1
!
interface FastEthernet0/1
 ip address 192.168.3.13 255.255.255.0
 no ip route-cache cef
 no ip route-cache
 duplex full
 speed 100
!
interface ATM1/0
 no ip address
 no ip route-cache cef
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
!
interface ATM1/0.4 point-to-point
 ip helper-address 207.177.36.5
 no ip route-cache
 bridge-group 1
 pvc 1/33
  encapsulation aal5snap
 !
!
interface BVI1
 ip address 207.177.36.253 255.255.255.224 secondary
 ip address 69.63.9.254 255.255.255.0
 ip broadcast-address 69.63.9.255
 no ip unreachables
!
ip default-gateway 207.177.36.254
ip classless
ip default-network 207.177.36.0
ip route 0.0.0.0 0.0.0.0 207.177.36.254
ip route 172.16.128.0 255.255.240.0 10.100.16.62
ip route 172.23.128.0 255.255.240.0 10.100.16.62
ip route 206.72.1.0 255.255.255.0 FastEthernet0/0
ip route 206.72.1.32 255.255.255.224 207.177.36.254
ip route 206.72.1.64 255.255.255.224 207.177.36.254
ip route 206.72.1.96 255.255.255.224 207.177.36.254
ip route 206.72.1.128 255.255.255.224 207.177.36.254
ip route 206.72.1.160 255.255.255.224 207.177.36.254
ip route 206.72.1.192 255.255.255.224 206.72.1.7
ip route 207.177.36.0 255.255.255.0 FastEthernet0/0
no ip http server
no ip http secure-server
!
!
access-list 100 permit ip 69.63.9.0 0.0.0.255 69.63.9.0 0.0.0.255
!
snmp-server engineID local
snmp-server community  RO
snmp-server enable traps tty
!
bridge 1 protocol ieee
bridge 1 route ip
!
!
!
line con 0
line aux 0
line vty 0 4
 exec-timeout 60 0
 password
 login local
line vty 5
 exec-timeout 60 0
 login local
!
ntp clock-period 17180494
ntp server 207.177.36.1 prefer
!
end

oatbran#






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