03-16-2012 03:14 PM - edited 03-04-2019 03:41 PM
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
03-16-2012 04:19 PM
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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