Getting very slow DSL speed on my 1721 router

Unanswered Question
Oct 24th, 2007

I have a 1721 with an ethernet WIC cloned to a dialer interface. The WIC goes out to a DSL modem. My issue is that ever since I deployed this router, the speed has been diminished enough to make people complain. Its a 3mb circuit, but this is what I show when I pull up the dialer interface:

Dialer0 is up, line protocol is up (spoofing)

Hardware is Unknown

Internet address is <MASKED>

MTU 1500 bytes, BW 3000 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 11/255

Encapsulation PPP, loopback not set

Keepalive set (10 sec)

DTR is pulsed for 1 seconds on reset

Interface is bound to Vi1

Last input never, output never, output hang never

Last clearing of "show interface" counters 1d01h

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

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/0/16 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 2250 kilobits/sec

5 minute input rate 133000 bits/sec, 0 packets/sec

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

603534 packets input, 698765983 bytes

394642 packets output, 47367523 bytes

Bound to:

Virtual-Access1 is up, line protocol is up

Hardware is Virtual Access interface

MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec,

reliability 255/255, txload 22/255, rxload 51/255

Encapsulation PPP, LCP Open

Open: IPCP

PPPoE vaccess, cloned from Dialer0

Vaccess status 0x44, loopback not set

Keepalive set (10 sec)

Interface is bound to Di0 (Encapsulation PPP)

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

Last clearing of "show interface" counters 20:11:48

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

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 174000 bits/sec, 7 packets/sec

5 minute output rate 5000 bits/sec, 5 packets/sec

427406 packets input, 470254490 bytes, 0 no buffer

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

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

295171 packets output, 36634198 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

As you can see, the virtual-Access1 interface is showing bandwidth of 56Kbit, whisch looks like ths slowness issue. What do I need to change on my config to get this speed to where it is supposed to be? Here is my currect interfaces config:

interface Loopback0

no ip address

shutdown

!

interface Ethernet0

no ip address

ip virtual-reassembly

half-duplex

pppoe enable

pppoe-client dial-pool-number 1

no cdp enable

!

interface Ethernet0.1

shutdown

no cdp enable

!

interface FastEthernet0

description local LAN

ip address <MASKED>

ip nbar protocol-discovery

ip nat inside

ip virtual-reassembly

speed 100

full-duplex

no cdp enable

!

interface Virtual-Template1

no ip address

!

interface Dialer0

bandwidth 3000

bandwidth inherit 3000

ip address <MASKED>

ip access-group 102 in

ip mtu 1492

ip inspect FIREWALL out

ip nat outside

ip virtual-reassembly

encapsulation ppp

no ip route-cache cef

no ip route-cache

no ip mroute-cache

dialer pool 1

dialer-group 1

ppp authentication pap chap callin

ppp chap hostname <MASKED>t

ppp chap password 7 <MASKED>

ppp pap sent-username <MASKED> password 7 <MASKED>

crypto map *********

!

ip classless

ip route 0.0.0.0 0.0.0.0 Dialer0

Thanks for any help!

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lgijssel Thu, 10/25/2007 - 01:07

Your config looks fairly OK to me. The bandwidth setting on the virtual interface is merely administrative and I do not think it affects the performance in any way.

I think it can be changed by modifying the bandwidth setting on interface Virtual-Template1.

For the poor performance, I think you should rather check the overbooking rate on the link and/or contact your provider.

regards,

Leo

erik.doss Thu, 10/25/2007 - 07:53

Is there any chance the IOS type could be doing this? I am currently using c1700-advsecurityk9-mz.124-1c.bin

lgijssel Mon, 10/29/2007 - 01:04

With such a low release number, there is always a chance for that. However, with an old platform like the 1700, I would not try an upgrade. Reason for this: newer releases also draw heavier on the system resources.

Try downgrading to a stable image in the 12.3 train instead.

regards,

Leo

erik.doss Mon, 10/29/2007 - 08:40

I sent them a 1700 with a DSL WIC to see if that helps. It has a 12.4 release, but I can always downgrade it remotely if need be. I do NOT like up/downgrading IOS images remotely because of the problems that may arise, but it is what it is.

Can someone have a look at this config to see if it looks ok? Thanks!

interface ATM0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0.1 point-to-point

pvc 0/35

pppoe-client dial-pool-number 1

!

!

interface FastEthernet0

description local LAN

ip address *.*.*.* 255.255.255.0

ip nat inside

ip virtual-reassembly

speed auto

full-duplex

no cdp enable

!

interface Dialer0

ip address *.*.*.* 255.255.255.248

ip access-group 102 in

ip mtu 1492

ip inspect FIREWALL out

ip nat outside

ip virtual-reassembly

encapsulation ppp

no ip route-cache cef

no ip route-cache

no ip mroute-cache

dialer pool 1

dialer-group 1

no cdp enable

ppp authentication pap chap callin

ppp chap hostname [email protected]

ppp chap password 7 ***********

ppp pap sent-username [email protected] password 7 *********

crypto map ****_map

!

no ip forward-protocol nd

ip route 0.0.0.0 0.0.0.0 Dialer0

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