internet connection goes down for couple of seconds and coming up

[amralrazzaz]

internet keep going down and up many times

my connection ( isp--asa--router--sw-sw--users)
im facing an issue happen randomly maybe periodically that internet connection goes down for
couple of seconds and coming up again , and this effecting our calls and meeting virtually

i have checked with ISP and no issue from there side
so i need help to get an ideas why internet connection packet losses for seconds and coming back?
is it power of network devices or cables between trunk ports or what ...
any idea of the internfaces that i can check the drop packets

i have received from ISP that i have to configure ip tcp adjust-mss 1300 under interface
and this configured on int which facing the switched
is this maybe the reason ? and shall i configure this also on ASA inside int which connected o this
router ? or shall i configure this command also to the int of router facing the asa ?)

also for the AP ( wap300n dlink ) can i check the dropped packet on this interface which connected
to switch? maybe issue from this ?
dont know
on router :
----------
interface GigabitEthernet0/0
description connected to local NW-INTERVLAN
no ip address
ip flow ingress
ip flow egress
ip tcp adjust-mss 1300
duplex auto
speed auto
no mop enabled

!
interface GigabitEthernet0/1
description connected to ASA
ip address -----------------
ip access-group BLOCK_SSH in
ip flow ingress
ip flow egress
ip virtual-reassembly in
duplex auto
speed auto
no mop enabled
!
--------------
AP INTERFACE :

C2960X-EGCAI01-SW2#show interfaces gigabitEthernet 1/0/14
GigabitEthernet1/0/14 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 5Z7c.6ZZ5.ZZZ (5Z7c.6ZZ5.ZZZ)
Description: connected_AP_Campina_Office
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 6/255, rxload 4/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1312
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1898000 bits/sec, 408 packets/sec
5 minute output rate 2374000 bits/sec, 463 packets/sec
57359046 packets input, 33349832377 bytes, 0 no buffer
Received 2285994 broadcasts (2007312 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2007312 multicast, 0 pause input
0 input packets with dribble condition detected
89029935 packets output, 71188877663 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

[amralrazzaz]

i have changed just yesterday ( changed all cables between network devices between asa and router and between router and switch )

note: im using pvst between my 2 switched so shall i change also the the 2 network cables between these 2 switches ? or no need? 

[Georg Pauwen]

Hello,

the D-LINK has Wi-Fi Multimedia QoS enabled by default, and 'No Acknowledgement' disabled by default (page 20 "How to set up QoS (Quality of Service) in the user guide linked below), try to toggle these settings and check if you see any improvement...

https://downloads.linksys.com/downloads/userguide/WAP300N_UG_EN_3425-01640A_Web,0.pdf

[amralrazzaz]

WMM Support—Wi-Fi Multimedia (WMM) already enabled and No Acknowledgement option disabled ! but shall i make this enable so If you do not want the WAP300N to re-send data each time an error occurs or shall i keep it disabled by default ?

[Georg Pauwen]

Hello,

set the WMM support to DISABLED and check if that makes a difference...

[amralrazzaz]

im sharing screenshots from current setup of AP so please check and ill disable th WMM and will test and see

please check the pics

[amralrazzaz]

hello , i have disabled the WMM and it seems better , in addition of that i did the following and please give me ur feedback :

1- i have changed my dns from google dns to my ISP dns 

2- changed the network cables between router and ASA FTD , and between router and switch

3-channel BW changed from 40MHZ only to Auto (20MHZ or 40MHZ) on AP

4- disabled WMM as per your recommendation  (check attached pic)

5-  i tried to do ping 8.8.8.8 -t on 2 laptop devices one connected to wifi and other connected to network cable for 6-7 hrs and below is the result 

wireless:
Ping statistics for 8.8.8.8:
Packets: Sent = 21869, Received = 21839, Lost = 30 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 38ms, Maximum = 849ms, Average = 49ms

wired:
Ping statistics for 8.8.8.8:
Packets: Sent = 20564, Received = 20525, Lost = 39 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 36ms, Maximum = 51ms, Average = 38ms

MY QUESTION IS according to what i have done so is there more things to do that can help to avoid the internet donw for couple of seconds ? 

also for the pinging result , how it was? is it fine and no packet losses or what does that mean ?

[Georg Pauwen]

Hello,

with everything you have changed, IS there actually still an outage (of a couple of seconds) ? PING packet loss seems acceptable.

[amralrazzaz]

is that few packet loss acceptable ? and do u have more steps to do and re check again ? to improve the disconnection of internet even if its few seconds loss and comeback again ? or ping result is fine and acceptable ?

any thing to do with configurations ? , I'm using PVST between the 2switches that i have ? but i still didn't change the nw cables between them ( 2 cables trunk ports) ? shall i change also or no need?

also regarding the port which i connect the AP on as below ? any modifications or its fine ?

interface GigabitEthernet1/0/20
description connected_AccessPoint_Office
switchport access vlan 30
switchport mode access

[amralrazzaz]

please check the switch port where the AP connected to with note something regarding the performance is little bit better than before after you asked me to disabled WMM on AP but for the below packet loss it was before 1312 and now 2317 after some video calls , so is that normal ? 

and is there any option to clear this counter of drop packets and calculate from beginning !

Switch-EG01-SW2#show int g1/0/14
GigabitEthernet1/0/14 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 5xxxc.6xx5.4xx (bia 5xxxc.6xx5.4xx)
Description: connected_AP_Office
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 3/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2317
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1048000 bits/sec, 252 packets/sec
5 minute output rate 1409000 bits/sec, 321 packets/sec
90774488 packets input, 50124910170 bytes, 0 no buffer
Received 4525686 broadcasts (3911766 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 3911766 multicast, 0 pause input
0 input packets with dribble condition detected
143951803 packets output, 112648986279 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

[Georg Pauwen]

Hello,

ideally there should not be any output drops at all. Do you have any QoS configured on the switch ? Try the below:

2960X(config)#mls qos queue-set output 2 threshold 3 3100 3100 100 3200

and this under your interfaces:

interface GigabitEthernet1/0/14
queue-set 2

[amralrazzaz]

hello -- i didnt configure any QoS on switch and please check below after i didnt what u have asked above :

after that what next to tracking the drop packets? is there any other steps to do ? 

!
mls qos queue-set output 2 threshold 3 3100 3100 100 3200
!
!

interface GigabitEthernet1/0/14
description connected_AP_Office
switchport access vlan 20
switchport mode access
queue-set 2

C2960X#sh int g1/0/14
GigabitEthernet1/0/14 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is xxx.xx05.4xx(bia xxx.xx05.4xx)
Description: connected_AP_Office
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 7/255, rxload 5/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2324
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 2177000 bits/sec, 397 packets/sec
5 minute output rate 3090000 bits/sec, 554 packets/sec
92288043 packets input, 50860813579 bytes, 0 no buffer
Received 4574275 broadcasts (3950933 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 3950933 multicast, 0 pause input
0 input packets with dribble condition detected
146466166 packets output, 114045757817 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

C2960X#show mls qos interface gigabitEthernet 1/0/14
GigabitEthernet1/0/14
QoS is disabled. When QoS is enabled, following settings will be applied
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
Trust device: none
qos mode: port-based

[Georg Pauwen]

Hello,

you need to enable MLS globally first:

mls qos

[amralrazzaz]

hello 

already enabled as below :

C2960X#show mls qos
QoS is enabled
QoS ip packet dscp rewrite is enabled

now shall i do something else?

also i have question ? ( now i have 2 switches connected together using PVST and maybe the trunk ports between 2 switch got some drop packets too so shall i do the the same configuration on other switch and under truck interfaces between switches do the same thing (queue-set 2) ? or no need?

now after these configs i can say QoS on switch enabled ? and for the drop packets which appear on port shall it reset to zero ? or how can i track this ? also this will help to improve the connection ?

[Georg Pauwen]

Hello,

clear the counters and monitor if the drop count continues:

clear counters

[amralrazzaz]

Hello again
would like to share the below output of the SW int where AP connected to , after clear counters and drops become to zero it getting counting
back again drop packets , so why it keep dropping ? is that mean internet connection wifi stability still need more improvement ? or its fine liek that on below ?

Note: i have 2 switches connected together (PVST) dunt know if this is an important or not ! 
sw2
g1/0/14 (Total output drops: 156)
description connected_AP_Office
g1/0/2 (Total output drops: 0)
description trunk-connected-to-SW1
g1/0/3 (Total output drops: 0)
description trunk-connected-to-SW1

spanning-tree mode rapid-pvst
spanning-tree logging
spanning-tree extend system-id
spanning-tree vlan 1-199,202-229,231-239,241-249,251-327,329-911 priority 4096
spanning-tree vlan 913-4094 priority 4096
spanning-tree vlan 200-201,230,240,250,328,912 priority 28672

sw1
g1/0/2 (Total output drops: 0)
description trunk-connected-to-SW2
g1/0/3 (Total output drops: 40)
description trunk-connected-to-SW2
g1/0/20 (Total output drops: 0)
description trunk-connected-to-officeRouter

spanning-tree mode rapid-pvst
spanning-tree logging
spanning-tree extend system-id
spanning-tree vlan 1,4-8,10-11,13-19,21-49,51-54,56-4094 priority 4096
spanning-tree vlan 2-3,9,12,20,50,55 priority 28672

SW2#show int g1/0/14
GigabitEthernet1/0/14 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is xx7c.6xxx.4xxx (xx7c.6xxx.4xx)
Description: connected_AP_Campina_Office
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters 3d16h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 156
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 157000 bits/sec, 72 packets/sec
5 minute output rate 1083000 bits/sec, 109 packets/sec
1726939 packets input, 701801878 bytes, 0 no buffer
Received 220469 broadcasts (203765 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 203765 multicast, 0 pause input
0 input packets with dribble condition detected
2677801 packets output, 2470671690 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out