Cisco 2610 ADSL

[scott.k.logan]

I have a cisco 2610 with a WIC1-ADSL card, and the c2600-is4-mz version of IOS installed...

...My problem, I do believe, is in configuration. If I show interface adsl 0/0, it shows that there are packets being sent and received. On the BVI1 interface, they're only being outputted. I'm using Embarq (sprint) DSL, and they told me to use 8/35 for my vpi and vci...I have a static IP. What am I doing wrong? I can't ping the gateway from my router...?

--scott

[paolo bevilacqua]

Hi,

please try:

interface ATM0/0

no bundle-enable

no bridge-group 1

no pvc 8/35

interface ATM0/0.1 point-to-point

bridge-group 1

pvc 8/35

encapsulation aal5snap

Hope this helps, please rate post if it does!

[chschroe]

I am not sure I understand why you need a BVI to accomplish your goal here.... you don't have any other interfaces in the bridge group to receive L2 packets.

Nothing is actually being bridged here, so you could probably just throw the ip configuration and the nat on the subint and get going!

NS

[paolo bevilacqua]

Hi NS,

Well, I'm nor sure about Embarq (sprint) DSL, but many ISPs use bridged rfc1483 encapsulation for their service, so that is the reason for the BVI and the suggest configuration.

The reason why they to that, is because when the CPE is a "dumb" modem/bridge, a PC directly connected via ethernet will work with either rfc1483 bridged or PPPoE encapsulation, but it would not work with rfc1483 routed encap.

[scott.k.logan]

I configured my old dsl 'modem' to use rfc1483...but I thought that was covered when I set the encapsulation to aal5snap in the pvc 8/35 within the atm 0/0...

[paolo bevilacqua]

Does it work with the config changes I suggested ?

The thing is that you have to use point-to-point interfaces for rfc1483, and the main ATM it is point-to-multipoint instead. So the need for a subinterface.

[scott.k.logan]

I did give that a try, simply executing those commands on top of the posted config...I would like to try it with a clean config, though. Now, I got the drift that you left the bvi in place and bridged it to the atm0/0.1, yes?

--scott

[paolo bevilacqua]

Yes. Pasting the lines should have been enough. May be they have routed encap, as NS incidentally suggested.

To try that, remove bridging, and configure IP directly under atm0/0.1

[scott.k.logan]

I'll try that with a fresh configuration right now. I did find, on google, someone configuring one of sprint's (who is now embarq) dsl modems as follows. It mentions encap;

DHCP= Server

Client IP Pool Starting Address= 192.168.1.2

Size of Client IP Pool= 1

Primary DNS Server= (supplied by Sprint) (204.x.x.10)

Secondary DNS Server= (supplied by Sprint) (199.x.x.10)

Remote DHCP Server= N/A

TCP/IP Setup:

IP Address= 192.168.1.1

IP Subnet Mask= 255.255.255.252

RIP Direction= Both

Version= RIP-1

Multicast= None

IP Policies=

Edit IP Alias= No

ISP's Name= MyISP

Encapsulation= ENET ENCAP

Multiplexing= LLC-based

VPI #= 8 (Assigned by Sprint)

VCI #= 35 (Assigned by Sprint)

Service Name= N/A

My Login= N/A

My Password= N/A

Single User Account= Yes

IP Address Assignment= Static

IP Address= (assigned by Sprint)

ENET ENCAP Gateway= (assigned by Sprint)

[scott.k.logan]

alright, I tried a fresh configuration, and I attached it. I still can't ping my next hop, but both the atm interfaces are transferring packets. Here are the show interfaces:

CNRouter#show interfaces ATM 0/0

ATM0/0 is up, line protocol is up

Hardware is DSLSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 448 Kbit, DLY 4570 usec,

reliability 210/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input 00:00:00, output 00:00:47, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Per VC Queueing

5 minute input rate 1000 bits/sec, 2 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

1607 packets input, 188486 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 994 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

7 packets output, 596 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

CNRouter#show interfaces ATM 0/0.1

ATM0/0.1 is up, line protocol is up

Hardware is DSLSAR (with Alcatel ADSL Module)

Internet address is 65.41.113.117/24

MTU 4470 bytes, BW 448 Kbit, DLY 4570 usec,

reliability 216/255, txload 1/255, rxload 1/255

Encapsulation ATM

1734 packets input, 201766 bytes

7 packets output, 596 bytes

0 OAM cells input, 0 OAM cells output

AAL5 CRC errors : 0

AAL5 SAR Timeouts : 0

AAL5 Oversized SDUs : 0

Last clearing of "show interface" counters never

Here is the running-config:

!

version 12.3

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname CNRouter

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

ip subnet-zero

ip cef

!

!

ip name-server 65.41.112.28

ip dhcp excluded-address 192.168.1.0 192.168.1.99

!

ip dhcp pool cnpool

network 192.168.1.0 255.255.255.0

default-router 192.168.1.1

dns-server 65.41.112.28

netbios-name-server 192.168.1.6

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

interface ATM0/0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0/0.1 point-to-point

ip address 65.41.113.117 255.255.255.0

pvc 8/35

encapsulation aal5snap

!

!

interface Ethernet0/0

ip address 192.168.1.99 255.255.255.0

ip nat inside

full-duplex

!

interface Serial0/1

no ip address

shutdown

!

no ip http server

ip classless

ip route 0.0.0.0 0.0.0.0 65.41.113.1

!

!

!

!

!

!

!

line con 0

line aux 0

line vty 0 4

login local

!

!

end

[chschroe]

Make sure you're pinging from the ATM interface... you don't have enough configuration for your nat to work at this point. :-)

NS

[scott.k.logan]

I put ip nat outside on the ATM0/0.1 interface, now what else do I have to do to configure nat?

[paolo bevilacqua]

Hi, by the example posted seems like it should be bridged, however you have many errors also:

1607 packets input, 188486 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 994 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

would try another router to verify that the circuit is working first.

[scott.k.logan]

When you say another router, do you mean try the WIC in a different router? or try a different DSL line? or try a different WIC?

--scott

[paolo bevilacqua]

Would try a "consumer level" dsl router on the same line.