01-14-2012 03:14 AM - edited 03-07-2019 04:21 AM
Hi all,
I have few problems with my 877w and I was hoping someone can help me.
1. NTP server
When I setup NTP server to take time from uk.pool.ntp.org everything is working fine but as soon as I reset my router during boot I can see that router is first trying to get time before it's even connected to ATM and when it can't get time from NTP server it's removing NTP line from configuration (
ntp server uk.pool.ntp.org source Dialer0 ). Can someone tell me how I setup to wait with sync and do it once ATM connection is up and established? Or can someone tell me how to get IOS to leave this line and sync with NTP every 10 min)?
2. When I download files from internet (download speed around 2mb/s - ADSL2+ connection from BT, C870 ADVSECURITY K9 and 15.1(3) firmware) my internet connection is dropped. Can someone tell me how to fix this problem?
01-14-2012 04:51 AM
Pawel,
Your NTP issue is strange. I must admit I have not yet seen a router itself removing an NTP server from its configuration. In any case, would you try modifying the command line as follows?
ntp server uk.pool.ntp.org prefer
i.e. don't refer to the source interface, and instead, declare the server as the preferred NTP server. There is no need to refer to the Dialer0 interface, as it will still be the egress interface, and the source IP of the NTP queries will be taken from it.
Regarding your internet connection, what exactly do you mean by "internet connection is dropped" - does the Dialer0 interface go down? Does the router report a link failure on the ATM/DSL interface? Or do just the downloads slow down and eventually stall but the DSL connection is stable?
Best regards,
Peter
01-14-2012 05:13 AM
Hi Pawel,
Could you try configuring your NTP server by using an IP address instead of a hostname? I suspect your 877 is doing a domain look up that's why it's taking some time to sync upon boot up. Try other NTP severs as well as this could be due to a geographic loacation.
For your item 2, please post your show dsl interface and show run output.
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01-14-2012 05:24 AM
John,
Good point! I was thinking about it as well but the thing is that the pool.ntp.org hostnames actually resolve to a number of IP addresses for load balancing and high availability reasons. Sticking with a particular IP address as an NTP IP address may in future cause problems if that IP address ceases to provide NTP services.
Nevertheless, at least worth trying.
Best regards,
Peter
01-14-2012 05:34 AM
Hey Peter,
I considered that as well but OP can configure multiple NTPs with different IP addresses just to keep the router's time in sync.
We also have 877s configured with ATM interface as the prefered source not sure why but i was hoping if you could shed a light on this.
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01-22-2012 11:33 AM
Unfortunately DNS-based load balancing doesn't work with NTP on routers.
The reason is the the router resolves the name only once, that is when it's configured intially, or on reboots.
So, you can as well configure two or three servers by IP, and leave it like that.
01-14-2012 06:18 AM
Thanks for all your tips in regards to NTP. I will try them and I will post an update later today. In terms of broadband dropping here are some info:
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 0x71BE
Chip Vendor Country: 0x0F 0xB5
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x0000 0x0000
Modem Vendor Country: 0xB5 0x00
Serial Number Near: FCZ11222250
Serial Number Far:
Modem VerChip ID: C196 (0)
DFE BOM: DFE3.0 Annex A (1)
Capacity Used: 99% 100%
Noise Margin: 2.5 dB 6.5 dB
Output Power: 20.0 dBm 12.5 dBm
Attenuation: 17.5 dB 6.0 dB
FEC ES Errors: 0 0
ES Errors: 1 0
SES Errors: 1 0
LOSES Errors: 1 2
UES Errors: 0 143
Defect Status: None None
Last Fail Code: None
Watchdog Counter: 0x77
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction: 0x00
Interrupts: 8247 (0 spurious)
PHY Access Err: 0
Activations: 1
LED Status: ON
LED On Time: 100
LED Off Time: 100
Init FW: init_AMR-4.0.015_no_bist.bin
Operation FW: AMR-4.0.015.bin
FW Source: embedded
FW Version: 4.0.15
DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 20083 0 1264
DS User cells: 0 1224761
US User & Idle cells: 0 2522033
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 3 0 32
Header Errors: 0 3 0 7
Total BER: 0E-0 1087E-11
Leakage Average BER: 0E-0 1087E-11
Interleave Delay: 0 39 0 15
ATU-R (DS) ATU-C (US)
Bitswap: enabled enabled
LOM Monitoring : Disabled
DMT Bits Per Bin
000: 0 0 0 0 0 0 3 6 8 A B C C D D D
010: E F F F F F F F F F F F E E E E
020: 0 1 2 2 3 4 4 5 6 7 7 8 8 9 9 A
030: A A B B B B C C C D D D D D D E
040: E E E E E E E E E F E F F E F F
050: F F F F F F F F E F F F E F E E
060: E E F F E E E E 2 E E E E E 0 E
070: E E E E E E E E E E E E E 4 4 0
080: 0 1 E E E E E E D E E E D E D D
090: D D D E D D D D D E D E D D D D
0A0: D D E D D D D D D D D D D D D D
0B0: D D D D D D D D D D D D 0 D D 0
0C0: D D D D D D D D D D D D D D D D
0D0: D C C D D D D D D D C C D D D C
0E0: C D D D D D D C C D D D D D C D
0F0: D C D 0 D D C D D D C C D C C C
100: C C C C C C C C C C C D C C C C
110: C C C C C C C C C B C C B C C C
120: B B B 0 B B B B B B B B B B B B
130: B B B B B B B B B B B B B C C C
140: C C C C C C C C C B C C B B C C
150: C B C C B B B B B B B B 0 B B B
160: B B B B B B B B B B B B B B B B
170: B B B B B A A B B B B B A A B A
180: B B A A B A A B A A A A A A A A
190: A A A A A A A A A A A A A A A A
1A0: A A A A A A A A 9 A 9 9 9 9 9 9
1B0: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9
1C0: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 8 9
1D0: 9 8 8 8 9 8 8 8 8 8 8 8 8 8 8 8
1E0: 8 8 8 8 8 8 8 8 8 7 7 7 7 7 7 7
1F0: 7 7 7 7 7 7 6 6 6 5 5 4 4 4 2 2
Broadband is dropping which means that status and protocol is up but connection to ISP is lost (pings to outside are dropping, I'm loosing my sttaic IP address and it's not coming back on. I need to reset router or restart interface). May this have something to do with MTU?
01-14-2012 07:27 AM
hi pawel,
your DSL SNR is below average. report this to your SP to have it fixed.
01-15-2012 02:36 PM
Noise Margin: 2.5 dB 6.5 dB
These values are not acceptable
Try to change cables and if it does not solves the problem please report problem to ISP.
01-22-2012 10:24 AM
Hi David,
What is average noise margin? I checked couple differnt routers on different broadband connections (with different cables & ADSL filters) and most of them have noise margin like my router and they don't have this problem.
I phoned my ISP and they run some basic tests on my phone line but they can't fine any problem. I next next couple of days I'm expecting engineer that will look into it from my side.
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