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Slow/unusable ADSL2+ on Cisco 877W

jameswh87
Level 1
Level 1

Hi all,

I just bought myself a Cisco 877W in hope that I could touch up on my IOS skills. The configuration went well, however I have found that after configuring the Dot11Radio0 interface, the ADSL2+ has slowed down dramatically. I am still syncing at a decent speed (decent enough for how far I live from the exchange), but web browsing and other internet traffic is horrible. Originally, I was downloading at ~500kb/s, but now I can't even navigate to a website to perform testing. : \

I have another ADSL2+ modem which works just fine (using it right now to write this post)

I originally thought this may have been a DNS issue. However, performing an nslookup on various sites from both the router itself and a client PC shows that resolution occurs in only a few seconds. With that said, there are some sites which will load in an instant (Google.com, for example) while others will simply refuse to load. DNS server (Server 2k8) is on the LAN with forwarders to ISP DNS addresses.

Given my limited knowledge of Cisco hardware and the IOS platform, I am hoping someone may be able to help me out here. : )

Here is some info from the router.

Router#sh int atm0

ATM0 is up, line protocol is up

Hardware is MPC ATMSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 990 Kbit/sec, DLY 370 usec,

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

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

10 maximum active VCs, 1024 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input 00:49:04, output 00:00:03, output hang never

Last clearing of "show interface" counters never

Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Per VC Queueing

5 minute input rate 46000 bits/sec, 0 packets/sec

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

30853 packets input, 23535938 bytes, 0 no buffer

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

0 input errors, 11 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

19850 packets output, 2247292 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 unknown protocol drops

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

Router#sh dsl int atm0

ATM0

Alcatel 20190 chipset information

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ITU G.992.5 (ADSL2+) Annex A

ITU STD NUM: 0x03 0x2

Chip Vendor ID: 'STMI' 'IFTN'

Chip Vendor Specific: 0x0000 0x71B9

Chip Vendor Country: 0x0F 0xB5

Modem Vendor ID: 'CSCO' ' '

Modem Vendor Specific: 0x0000 0x0000

Modem Vendor Country: 0xB5 0x00

Serial Number Near: FHK0941118C

Serial Number Far:

Modem VerChip ID: C196 (0)

DFE BOM: DFE3.0 Annex A (1)

Capacity Used: 100% 100%

Noise Margin: 3.0 dB 6.5 dB

Output Power: 18.5 dBm 13.0 dBm

Attenuation: 48.0 dB 27.0 dB

FEC ES Errors: 0 0

ES Errors: 0 0

SES Errors: 0 0

LOSES Errors: 0 2

UES Errors: 0 126

Defect Status: None None

Last Fail Code: None

Watchdog Counter: 0xFA

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction: 0x00

Interrupts: 8271 (0 spurious)

PHY Access Err: 0

Activations: 1

LED Status: ON

LED On Time: 100

LED Off Time: 100

Init FW: init_AMR-3.0.014_no_bist.bin

Operation FW: AMR-3.0.014.bin

FW Source: embedded

FW Version: 3.0.14

DS Channel1 DS Channel0 US Channel1 US Channel0

Speed (kbps): 0 5570 0 990

Cells: 0 499400 0 7119461

Reed-Solomon EC: 0 30802 0 124

CRC Errors: 0 1218 0 32

Header Errors: 0 946 0 13

Total BER: 0E-0 1169E-8

Leakage Average BER: 0E-0 1169E-8

Interleave Delay: 0 52 0 1

ATU-R (DS) ATU-C (US)

Bitswap: enabled enabled

Bitswap success: 0 0

Bitswap failure: 0 0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 4 6 8 B C C C D D D

010: D D D C C C C C C B B A 9 9 8 7

020: 0 6 7 8 A B B C C C C C C C C C

030: C C C C C C C C C C C C C D D D

040: C C D C C C C C C D C B B B D 2

050: D D D D D D B D D D C C D D D D

060: C D D D D D D D C B B C C B 0 C

070: C C C B C C C B A A B B B 5 4 0

080: 2 2 8 7 5 0 0 4 6 7 7 7 8 8 8 8

090: 8 7 2 7 8 8 8 8 7 7 7 7 7 6 5 5

0A0: 4 0 0 0 0 3 4 5 5 6 6 7 7 7 7 7

Router#sh run

Building configuration...

Current configuration : 4349 bytes

!

version 12.4

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Router

!

boot-start-marker

boot-end-marker

!

logging message-counter syslog

enable secret 5 $1$OC5z$OSWykGCnpteN8ZJmuPL7K/

!

no aaa new-model

!

crypto pki trustpoint TP-self-signed-1232153300

enrollment selfsigned

subject-name cn=IOS-Self-Signed-Certificate-1232153300

revocation-check none

rsakeypair TP-self-signed-1232153300

!

!

crypto pki certificate chain TP-self-signed-1232153300

certificate self-signed 01

30820249 308201B2 A0030201 02020101 300D0609 2A864886 F70D0101 04050030

31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274

69666963 6174652D 31323332 31353333 3030301E 170D3036 30323136 31333031

31365A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649

4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D31 32333231

35333330 3030819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281

81008F40 8FBB84C2 18D36439 C58348C6 D31A9AE7 22EC03E6 F92E3D23 73E05C62

61C752A4 B1138048 C62F2F2A 2CA765D8 D4CA786B D89745FD 15C226C1 44A08296

EA79968B 89E8C365 274AB65F A1FA2297 2092D69C 816ECD71 AD117F99 62F3E816

B93F6FDE 511F624B 7AF12C2C 2F74E870 08DDD818 1FD6D66A 24DD8059 E99A445B

CBBD0203 010001A3 71306F30 0F060355 1D130101 FF040530 030101FF 301C0603

551D1104 15301382 116D6172 6B617274 682E6E69 726E2E6C 616E301F 0603551D

23041830 16801421 5CB404C6 94843140 1E0DE964 60836D2B 953C4A30 1D060355

1D0E0416 0414215C B404C694 8431401E 0DE96460 836D2B95 3C4A300D 06092A86

4886F70D 01010405 00038181 0073DEA4 D5949505 D32EF106 A4ABE1DA 43FC0AC7

85F3AD5C B9B49FC4 DC6A3D1F F997C9AC F4C574FB CEEC6EBE C5B4D74D 1F17E40B

AE1F2C46 675346C6 100B5102 9B6E045A C2DD70A8 E3335F39 8741ABB9 F5383DD1

8522951B A7F17FE6 DE654333 BA3C124D B3B531ED CCCCE349 918DBA7B CC804514

2A7A0F58 E8BC573B FD301E0F 62

quit

dot11 syslog

!

dot11 ssid ssid1

vlan 1

authentication open

authentication key-management wpa

guest-mode

wpa-psk ascii 0 xxxxxx

!

ip source-route

!

!

!

!

ip cef

ip name-server 10.161.1.242

no ipv6 cef

!

multilink bundle-name authenticated

!

!

!

username xxxxxx password 0 xxxxxx

!

!

!

archive

log config

hidekeys

!

!

!

bridge irb

!

!

interface ATM0

no ip address

no ip redirects

no ip unreachables

no ip proxy-arp

no ip mroute-cache

no atm ilmi-keepalive

dsl operating-mode adsl2+

hold-queue 4096 in

!

interface ATM0.1 point-to-point

description $ES_WAN$$FW_OUTSIDE$

pvc 8/35

pppoe-client dial-pool-number 1

!

!

interface FastEthernet0

switchport mode trunk

!

interface FastEthernet1

!

interface FastEthernet2

!

interface FastEthernet3

!

interface Dot11Radio0

no ip address

ip helper-address 10.161.1.242 (not sure if this is actually needed as DHCP is on the same LAN as the router?)

!

encryption vlan 1 mode ciphers tkip

!

broadcast-key vlan 1 change 45

!

!

ssid ssid1

!

speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0 54.0

station-role root

!

interface Dot11Radio0.1

description --SubIntforRadio--

encapsulation dot1Q 1 native

bridge-group 1

bridge-group 1 subscriber-loop-control

bridge-group 1 spanning-disabled

bridge-group 1 block-unknown-source

no bridge-group 1 source-learning

no bridge-group 1 unicast-flooding

!

interface Vlan1

description --- Inside ---

no ip address

ip nat inside

ip virtual-reassembly

bridge-group 1

bridge-group 1 spanning-disabled

!

interface Dialer1

description --- Outside ---

ip address negotiated

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

no cdp enable

ppp authentication pap callin

ppp pap sent-username xxxxxx xxxxxx

!

interface Dialer0

no ip address

ip tcp adjust-mss 1452

!

interface BVI1

ip address 10.161.1.250 255.255.255.0

ip nat inside

ip virtual-reassembly

!

ip forward-protocol nd

ip route 0.0.0.0 0.0.0.0 Dialer1

no ip http server

ip http secure-server

ip http secure-port 8080

!

!

ip dns server

ip nat inside source list nat interface Dialer1 overload

!

ip access-list extended nat

permit ip 10.161.1.0 0.0.0.255 any

!

!

!

!

!

!

control-plane

!

bridge 1 protocol ieee

bridge 1 route ip

!

line con 0

no modem enable

line aux 0

line vty 0 4

password xxxxxx

login local

!

scheduler max-task-time 5000

end

1 Reply 1

jameswh87
Level 1
Level 1

Looks like this one might be solved.

For those of you with a similar issue, I simply moved "ip tcp adjust-mss 1452" to Dialer1 interface and all seems to be normal now. I will post back if I face anymore problems.

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