08-09-2005 02:59 PM
Hi,
I'm configuring an 2621XM with ADSL WIC on an 8Mb/512Kb line. With this setup, I can achieve a maximum throughput of 2.4Mbs (almost exact). If I put a cheap and cheerful ADSL router (free from the ISP) on the line, i get the full 8Mb.
The config is below. I fiddled around with MTU, but i cant see why this should be. Is there an inherent limit on the ADSL WIC? It reports the correct line speed (auto 8Mb/512Kb) with no errors on the line (sh dsl / sh atm).
Any thoughts or help appreciated.
Regards
Richard
Config
using 1921 out of 29688 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CCME1
!
boot-start-marker
boot-end-marker
!
enable secret 5 xxxxxx
enable password xxxxx
!
memory-size iomem 20
no network-clock-participate slot 1
no network-clock-participate wic 0
ip subnet-zero
!
!
!
!
ip cef
ip name-server 212.x.x.36
ip name-server 195.x.x.36
ip ips po max-events 100
no aaa new-model
no ftp-server write-enable
!
!
interface ATM0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet0/0
ip address 10.0.0.254 255.255.255.0
ip nat inside
ip virtual-reassembly
speed auto
full-duplex
h323-gateway voip bind srcaddr 10.0.0.254
!
interface FastEthernet0/1
no ip address
ip virtual-reassembly
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
!
interface Dialer0
ip address negotiated
ip mtu 1452
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp chap hostname xxxxxx
ppp chap password 0 xxxxxxx
ppp pap sent-username xxxxxxx
ppp ipcp dns request
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
ip http server
no ip http secure-server
ip nat inside source list 1 interface Dialer0 overload
!
access-list 1 permit 10.0.0.0 0.0.0.255
dialer-list 1 protocol ip permit
!
!
!
control-plane
!
!
!
voice-port 1/0/0
connection plar opx 1001
!
voice-port 1/0/1
!
voice-port 1/1/0
!
voice-port 1/1/1
!
!
!
!
dial-peer voice 10 voip
destination-pattern 1001
session target ipv4:10.0.0.102
!
dial-peer voice 1 pots
destination-pattern 9T
port 1/0/0
08-09-2005 08:26 PM
Hello,
try and set the dsl operating-mode to ansi-dmt:
interface ATM0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
--> dsl operating-mode ansi-dmt
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
And see if that makes a difference...
Regards,
GP
08-11-2005 02:28 PM
Nope. No difference at all.
The fact that it's 300KB/s (2.4Mb) and exactly this figure makes me think it's something like a performance issue with ppp or perhaps buffer configuration.
Thanks for the suggestion though.
Regards
Richard
08-11-2005 09:54 PM
Hello Richard,
you could try and set the MTU size to something different from what you have now (1452), try e.g. 1474, or 1500.
Who is your provider in the UK ?
Regards,
GP
08-12-2005 12:25 AM
Hi,
I've changed the MTU on both the dialer and ATM interfaces to various settings, but nothing seems to make any difference.
I also noticed that the CPU utilisation is around 20% but cant see which process is using it.
Thanks for the suggestions.
Regards
Richard
08-12-2005 12:26 AM
The ISP in question is UKOnline, the retail arm of Easynet.
08-26-2005 10:50 AM
I know it it stating the obvious but your FastEthernet interface is set to Full-Duplex, is it hard-coded on the other end of this link? i.e. your switch or direct to a PC via a cross-over cable.
Andy
08-31-2005 03:25 AM
Hi Andy,
Nope. Not that. Thanks for the repsonse.
Richard
08-23-2006 10:31 AM
Hi Richard,
did you find the problem with the adsl speeds?
Regards,
09-09-2006 03:34 PM
I had the same issue. The ATM interface clock rate defaults to 2.6Mbps. You have to set this higher as appropriate. The max clockrate is 7Mbps.
09-10-2006 01:17 PM
Hi All
This is the Link that you need.
09-23-2006 10:39 AM
I have encountered the same exact problem. This is the command I used under the ATM interface. The default limits throughput to around 2.5mb.
clock rate aal5 8000000
10-02-2006 04:04 PM
I was searching for my own answer and read your post.
interface ATM0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
I see the Point to Point Protocol configured but wanted to know if the line-code is ethernet or ATM. I'm not sure if your ISP requires a different pvc but the pvc for ethernet is 8/35 and ATM is 0/35 for ADSL.
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