Tweaking cisco 837 on el-nasty ADSL (UK)

[DorsetBunny]

So I have a nasty line here (nothing to be done about that until the telecoms provider gets bored with my one letter a week).

I have 7.5db at best (and has dropped to 5.5db during peak times). I've already done all I can internally (only the dsl line hooked up, phones in bin, hi grade socket filter, cat5 socket > router etc...).

Is there anything I can do in the router (other than dsl noise margin 3) to improve traffic flow?

Basically I do lots of gaming UDP/TCP traffic and latency is the obvious be-all and end-all. I get crappy pings.

the only other traffic is the usual net stuff, and my ssh to my webserver (Germany).

these are low priority really so am asking the cisco-gods if there is anything tweaky I can do in the confs to whoosh those packets through.

I am on a fast latency connection (that did help a bit). I am rated at 4-5Mb and the DSLAM seems to like syncing at 5000ish (would it benefit if I asked for a 4000cap on sync's?)

The cisco is running 12.4(25c) and is about to be 80MB/24MB (so I can fit the SDM on there with this IOS).

 

[DorsetBunny]

Noise Margin: 7.5 dB 18.0 dB
Output Power: 20.0 dBm 12.0 dBm
Attenuation: 37.0 dB 21.0 dB

at 07:06

 

[burtsbees]

post a sh run and sh atm int

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[DorsetBunny]

FLUFFY# show dsl interface atM 0
ATU-R (DS) ATU-C (US)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.1 (G.DMT)
ITU STD NUM: 0x01 0x01
Vendor ID: 'ALCB' 'TSTC'
Vendor Specific: 0x0000 0x0400
Vendor Country: 0x00 0xB5
Capacity Used: 100% 60%
Noise Margin: 8.0 dB 18.0 dB
Output Power: 20.0 dBm 12.0 dBm
Attenuation: 37.0 dB 21.0 dB
Defect Status: None None
Last Fail Code: None
Selftest Result: 0x00
Subfunction: 0x15
Interrupts: 653 (1 spurious)
Activations: 2
Init FW: embedded
Operartion FW: embedded
SW Version: 3.9.220
FW Version: 0x1A04

Interleave Fast Interleave Fast
Speed (kbps): 0 4832 0 448
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 115 0 0
Header Errors: 0 49 0 0
Bit Errors: 0 0
BER Valid sec: 0 0
BER Invalid sec: 0 0

LOM Monitoring : Enabled
LOM watch configured for 200 times, LOM appeared continuously for 0 times

DMT Bits Per Bin
00: 0 0 0 0 0 0 0 2 2 2 5 6 7 7 7 7
10: 7 8 8 7 7 8 7 7 7 7 5 4 5 4 0 0
20: 0 0 0 0 0 0 7 7 8 8 8 9 9 9 9 9
30: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9
40: 0 8 9 8 8 8 8 8 8 8 8 8 8 8 8 8
50: 8 8 8 8 8 9 8 8 9 2 9 9 9 8 9 8
60: 9 8 9 8 9 8 9 8 8 8 8 8 8 8 8 8
70: 8 8 8 8 8 8 8 8 8 8 8 7 8 7 8 6
80: 7 7 8 8 8 7 7 6 6 7 7 7 6 7 6 7
90: 6 7 6 7 5 6 7 7 6 6 6 7 6 6 5 6
A0: 5 4 6 6 6 5 6 5 7 5 7 5 7 6 7 6
B0: 6 7 6 5 5 6 6 6 5 6 5 6 5 6 5 5
C0: 4 5 4 5 5 5 4 4 4 5 4 4 4 4 4 4
D0: 4 4 4 2 4 4 4 4 4 4 4 4 4 4 4 4
E0: 4 4 4 4 4 3 3 3 3 4 4 4 4 4 3 3
F0: 2 3 2 2 0 0 0 0 0 0 0 0 0 0 0 0

Training log buffer capability is not enabled yet.


sh run


!
version 12.4
no service pad
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname FLUFFY
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 notifications
enable secret 5 ***********************
!
no aaa new-model
clock timezone GMT 0
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.10.10.1 10.10.10.10
!
ip dhcp pool CLIENT
import all
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
dns-server 194.168.4.100 194.168.8.100
lease 0 2
!
!
ip cef
ip domain name onthecosta.com
ip name-server 194.168.4.100
ip name-server 194.168.8.100
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
username ********* password 7 ***************
username public
!
!
!
!
!
!
interface Ethernet0
ip address 10.10.10.1 255.255.255.0
ip nat inside
no ip virtual-reassembly
no ip mroute-cache
hold-queue 100 out
!
interface Ethernet2
no ip address
shutdown
hold-queue 100 out
!
interface ATM0
no ip address
no ip mroute-cache
atm vc-per-vp 64
no atm ilmi-keepalive
dsl operating-mode auto
dsl lom 200
dsl noise-margin 3
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet1
duplex auto
speed auto
!
interface FastEthernet2
duplex auto
speed auto
!
interface FastEthernet3
duplex auto
speed auto
!
interface FastEthernet4
duplex auto
speed auto
!
interface Dialer1
ip address negotiated
ip nat outside
no ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap pap callin
ppp chap hostname *****************************
ppp chap password 7 *****************
ppp pap sent-username ************** password 7 ***************
hold-queue 224 in
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Dialer1
!
ip http server
no ip http secure-server
!
ip nat pool POOL1 10.10.10.2 10.10.10.2 netmask 255.255.255.0 type rotary
ip nat inside source list 1 interface Dialer1 overload
ip nat inside source list 102 interface Dialer1 overload
ip nat inside source static tcp 10.10.10.2 6552 interface Dialer1 6552
ip nat inside source static udp 10.10.10.2 6552 interface Dialer1 6552
ip nat inside destination list MW2 pool POOL1
ip nat inside destination list Steam pool POOL1
!
!
ip access-list extended MW2
permit tcp any any eq 28960
permit tcp any any range 27014 27050
permit udp any any range 27000 27030
permit udp any any eq 1500
permit udp any any eq 3005
permit udp any any eq 3101
permit udp any any eq 28960
permit udp any any eq 20510
permit udp any any eq 20500
permit udp any any eq 1200
permit udp any any eq 4380
permit udp any any eq 8767
ip access-list extended Steam
permit tcp any any range 50000 65535
permit udp any any range 50000 65535
logging trap debugging
logging 10.10.10.2
access-list 23 permit 10.10.10.0 0.0.0.255
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
dialer-list 1 protocol ip permit
snmp-server community public RO
!
!
!
control-plane
!
banner motd ^C
######################################################################
# _ _ #
# \`\ /`/ Welcome to FLUFFY #
# \ V / #
# /. .\ Cisco 837 ADSL Router #
# =\ T /= Admin: *********************** #
# / ^ \ V2.0.1 released 16th February 2010 #
# {}/\\ //\ Cisco IOS 12.4-12 #
# __\ " " /__ #
# (____/^\____) If you aren't suposed to be here; LEAVE NOW! #
# #
######################################################################

^C
!
line con 0
exec-timeout 120 0
no modem enable
stopbits 1
line aux 0
stopbits 1
line vty 0 4
access-class 23 in
exec-timeout 0 0
login local
length 0
transport preferred ssh
transport input ssh
transport output all
!
scheduler max-task-time 5000
ntp server 194.35.252.7
end

 

[burtsbees]

interface atm0
clock rate aal5 7000000
clock rate aal2 2600000

That will set the max clock rate. Default I believe is like 3Mb down and 500Mb up (aal5 3000000, aal2 500000), but don't quote me on that.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[Minue]

Hello
See if you can borrow a cheap ADSL modem from a friend and test it on your line.Some Cisco ADSL modems don't sync well.
On Monday I will ask my workmates that work in th ADSL department if there's a work-around and I will let you know.

Reagards

 

[DorsetBunny]

I have used a Homehub2.0 (Yuk) and my spare Netgear DG834Gv5 (not the best but works as a WAP) - both get similar SNR / latency issues - also my sisters line next door is about the same.

interface atm0
clock rate aal5 7000000
clock rate aal2 2600000 --> not supported commands on 837

also I think if I were to try and set the connection higher it would lead to even more issues (LOM). I might give the techies a call at Virgin and see if they can override the DSLAM to sync me a bit lower (say 4Mb max) as that should leave a little headroom.

 

[burtsbees]

A.Check the outside phone cable where it terminates at the DEMARC (for loose connection, corrosion, etc.)

B.int atm0
clock rate aal2 ?

to see what rates are available for your model/IOS.

You could also use GNS3/Dynamips to test any IOS you may have...

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!