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cisco 831 - won't obtain IP address

 
 
Jan
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      03-23-2010
Hi,

I know this is probably something trivial but I can't figure it out for
nothing.

I've got a 831 running on a cable connection (DHCP from ISP's end).

couple days ago router lost connectivity (ISP does change IP address
sometimes) and just won't obtain a new dhcp address.

Here the config if it helps, any ideas would be appreciated!



!
version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname leeroyjenkins
!
enable secret 5 xxxx
!
username biatch privilege 15 secret 5 xxxx
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 10.10.0.1 10.10.0.40
!
ip dhcp pool MyLAN
network 10.10.0.0 255.255.255.0
default-router 10.10.0.1
dns-server 8.8.8.8 8.8.4.4
!
ip dhcp pool johnspc
host 10.10.0.64 255.255.255.0
client-identifier 0100.2185.5d6a.56
default-router 10.10.0.1
dns-server 8.8.8.8 8.8.4.4
!
ip cef
ip audit notify log
ip audit po max-events 100
no ftp-server write-enable
!
!
!
!
!
!
interface Ethernet0
description ****** INSIDE LAN ******$FW_INSIDE$
ip address 10.10.0.1 255.255.255.0
ip access-group 104 in
ip nat inside
hold-queue 100 out
!
interface Ethernet1
description ***** OUTSIDE INTERFACE *******$FW_OUTSIDE$
ip address dhcp
ip access-group 105 in
ip nat outside
traffic-shape rate 8192000 204800 204800 1000
!
ip nat inside source list 100 interface Ethernet1 overload
ip classless
no ip http server
no ip http secure-server
!
access-list 100 permit ip 10.10.0.0 0.0.0.255 any
access-list 104 remark auto generated by SDM firewall configuration
access-list 104 remark SDM_ACL Category=1
access-list 104 deny ip host 255.255.255.255 any
access-list 104 deny ip 127.0.0.0 0.255.255.255 any
access-list 104 remark allow VPN traffic
access-list 104 permit gre 0.0.0.0 255.255.255.0 any
access-list 104 permit ip any any
access-list 105 remark auto generated by SDM firewall configuration
access-list 105 remark SDM_ACL Category=1
access-list 105 remark Auto generated by SDM for NTP (123) 208.75.88.4
access-list 105 permit udp host 208.75.88.4 eq ntp any eq ntp
access-list 105 remark Auto generated by SDM for NTP (123) 212.13.195.4
access-list 105 permit udp host 212.13.195.4 eq ntp any eq ntp
access-list 105 permit gre any any
access-list 105 deny ip 10.10.0.0 0.0.0.255 any
access-list 105 permit icmp any any echo-reply
access-list 105 permit icmp any any time-exceeded
access-list 105 permit icmp any any unreachable
access-list 105 deny ip 10.0.0.0 0.255.255.255 any
access-list 105 deny ip 172.16.0.0 0.15.255.255 any
access-list 105 deny ip 127.0.0.0 0.255.255.255 any
access-list 105 deny ip any any log
banner motd ^C
************************************************** *****************

^C
!
line con 0
no modem enable
transport preferred all
transport output all
line aux 0
transport preferred all
transport output all
line vty 0 4
exec-timeout 120 0
login local
length 0
transport preferred all
transport input telnet ssh
transport output all
!
scheduler max-task-time 5000
ntp clock-period 17179938
ntp server 212.13.195.4
ntp server 208.75.88.4
!
end


--
* has started to scramble (Stargate)
 
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Rob
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Posts: n/a
 
      03-23-2010
Jan <(E-Mail Removed)> wrote:
> Hi,
>
> I know this is probably something trivial but I can't figure it out for
> nothing.
>
> I've got a 831 running on a cable connection (DHCP from ISP's end).
>
> couple days ago router lost connectivity (ISP does change IP address
> sometimes) and just won't obtain a new dhcp address.
>
> Here the config if it helps, any ideas would be appreciated!


You probably played with the access list config?
It blocks almost everything, including dhcp.
Look in the log to see what the finaly deny line is blocking.
 
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Thrill5
Guest
Posts: n/a
 
      03-24-2010

"Rob" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)4all.nl...
> Jan <(E-Mail Removed)> wrote:
>> Hi,
>>
>> I know this is probably something trivial but I can't figure it out for
>> nothing.
>>
>> I've got a 831 running on a cable connection (DHCP from ISP's end).
>>
>> couple days ago router lost connectivity (ISP does change IP address
>> sometimes) and just won't obtain a new dhcp address.
>>
>> Here the config if it helps, any ideas would be appreciated!

>
> You probably played with the access list config?
> It blocks almost everything, including dhcp.
> Look in the log to see what the finaly deny line is blocking.


Also get rid of the traffic-shaper on the external interface. Your shaping
a 10MB interface (which is actually 10,000,000 bits/sec, not 10MB/s) to 8MB
with a 2MB burst, which is 10,240,00 bits/s)! This is not doing what you
think it is and you should remove it. TCP does a much better job of
flow-control than just a crude traffic-shaper. If you were using a shaper
with a QoS policy that would be one thing, but a stand-alone shaper is not
something that is done in this situation.


 
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