From: john matijevic (john.matijevic@gmail.com)
Date: Tue May 24 2005 - 11:35:47 GMT-3
Hello ccie2002,
Can you please clarify the issue you are having, I dont seem to understand
what the problem is? Are you having a problem making a dsl connection? Do
you see a loopback when a loopback is not configured?
Sincerely,
John
On 5/23/05, ccie2002@bellsouth.net <ccie2002@bellsouth.net> wrote:
>
> Hello:
>
> I have a ADSL connection running PPPOE with a dialer interface on a Cisco
> 2600 router with 12.2 IOS connecting to Bell South
>
> The problem I am seeing is that when I turn on ethereal and sniff
> the traffic on my LAN going out on the ADSL connection
> I am seeing a loopback on the mac address for my protocol.
> The protocol type is loopback with 0x9000.
>
> I still can reach the internet even with this loopback seen so I do not
> know
> why I am seeing a loop on ethereal sniffing the traffic
> going out on the WAN.
>
> I ran a tcp dump on the same connection and I do not
> see any problems with this. Does anyone know why I might
> be seeing the protocol loop on my ethereal when sniffing the traffic.
>
> Is there something I need to configure in my router
> to stop this from occurring. Please note, I took all devices off
> the LAN and left just my laptop (ip 10.10.10.4 <http://10.10.10.4>) and
> my router (10.10.10.1 <http://10.10.10.1>) and the problem was still
> there.
>
> I was seeing the same source and designation for my
> mac address of my ethernet interface in my router.
> (10.10.10.1 <http://10.10.10.1>)
>
>
> I did not include the ethereal snapshots as it is a cap file and not sure
> how
> to put the cap file in txt format.
>
>
> Rack1R5#sh arp
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 10.10.10.1 <http://10.10.10.1> - 0010.7b1c.a220 ARPA Ethernet0/0
> Internet 10.10.10.6 <http://10.10.10.6> 6 000d.9d84.05a4 ARPA Ethernet0/0
> Internet 10.10.10.4 <http://10.10.10.4> 1 000d.608e.4ab6 ARPA Ethernet0/0
> Internet 10.10.10.5 <http://10.10.10.5> 6 000c.411b.4405 ARPA Ethernet0/0
>
>
> Below shows I can stil reach the internet
>
>
> Rack1R5#ping cisco.com <http://cisco.com>
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 198.133.219.25 <http://198.133.219.25>,
> timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 108/109/112 ms
> Rack1R5#
>
> TCP dump below shows nothing
>
>
> linux:/home/cisco# tcpd -i eth0
>
> linux:/home/cisco #
>
> Configs of router below
>
>
> version 12.2
> service timestamps debug datetime msec
> service timestamps log datetime msec
> service password-encryption
> !
> hostname "Rack1R5"
> !
> logging buffered 4096 debugging
>
> !
>
> username XXXXXX@bellsouth.net password XXXXXX
> ip subnet-zero
> !
> !
> ip name-server 205.152.37.23 <http://205.152.37.23>
> ip name-server 205.152.132.23 <http://205.152.132.23>
> ip dhcp excluded-address 192.168.1.2 <http://192.168.1.2>
> ip dhcp excluded-address 10.10.10.1 <http://10.10.10.1>
> ip dhcp excluded-address 205.152.37.23 <http://205.152.37.23>
> ip dhcp excluded-address 205.152.132.23 <http://205.152.132.23>
> !
> ip dhcp pool DHCP
> network 192.168.1.0 <http://192.168.1.0>
255.255.255.0<http://255.255.255.0>
> default-router 192.168.1.2 <http://192.168.1.2>
> !
> ip dhcp pool TEST
> network 10.10.10.0 <http://10.10.10.0> 255.255.255.0<http://255.255.255.0>
> default-router 10.10.10.1 <http://10.10.10.1>
> dns-server 205.152.132.23 <http://205.152.132.23>
> lease infinite
>
>
>
> ip cef
> vpdn enable
> !
> vpdn-group pppoe
> request-dialin
> protocol pppoe
> !
> ip cef
> vpdn enable
> !
> vpdn-group pppoe
> request-dialin
> protocol pppoe
> !
>
> interface ATM0/0
> bandwidth 384
> no ip address
> load-interval 30
> no atm ilmi-keepalive
> dsl operating-mode ansi-dmt
> !
> interface ATM0/0.100 point-to-point
> pvc 8/35
> cbr 384
> pppoe-client dial-pool-number 1
>
>
> interface Ethernet0/0
> ip address 10.10.10.1 <http://10.10.10.1>
255.255.255.0<http://255.255.255.0>
> ip nat inside
> ip nbar protocol-discovery
> load-interval 30
> half-duplex
>
>
> interface Dialer1
> ip address X.X.X.X 255.255.255.0 <http://255.255.255.0>
> ip access-group 160 in
> ip accounting output-packets
> ip mtu 1492
> ip nat outside
> ip nbar protocol-discovery
> encapsulation ppp
> dialer pool 1
> dialer idle-timeout 0
> ppp authentication chap callin
> ppp chap hostname XXXXXXX@bellsouth.net
> ppp chap password XXXXXXX
>
> _______________________________________________________________________
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>
-- John Matijevic, CCIE #13254 U.S. Installation Group Senior Network Engineer 954-969-7160 ext. 1147 (office) 305-321-6232 (cell)
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