Written by CiscoNET   
Friday, 17 December 2010 08:37

It is been almost decade with www.CiscoNET.com and now moving to new site www.ipBalance.com in any reason. I hope sharing technical tips and expertise would be beneficial for any individual.




Last Updated on Friday, 27 July 2012 07:57
Written by CiscoNET   
Wednesday, 31 March 2010 13:46

LFI stands for Link Fragmentation and interleaving is not of QoS mechanism. However, it is help for real-time traffic such as VOIP on small size of link. LFI on Multilink PPP allows large packets to be fragmented into a small size to fit a minimum delay requirement for real-time traffic. Also, interleaving function provides a special transmit queue for the high priority traffic can be sent earlier than others.

1. Configuring LFI on Multilink PPP

Router-LFI-1#conf t
Router-LFI-1(config)# interface multilink 1
Router-LFI-1(config-if)# ppp multilink fragment delay 10 ; 10ms for VOIP delay requirement
Router-LFI-1(config-if)# ppp multilink interleave
Router-LFI-1(config-if)# ip address
Router-LFI-1(config-if)# bandwidth 1536 ; Specify for auto fragmentation calculation
Router-LFI-1(config-if)# ppp multilink endpoint hostname

Router-LFI-1(config-if)# interface serial1/0
Router-LFI-1(config-if)# encapsulation ppp
Router-LFI-1(config-if)# ppp multilink group 1


Last Updated on Wednesday, 31 March 2010 14:10
Written by CiscoNET   
Wednesday, 17 March 2010 00:04

Came across good Cisco IP routing concept and fundametal videos on Internet. It produced by Routehub is Premium Cisco Consulting provider of Cisco Products, Solutions, Training, and Professional Services for small, medium, and large-sized businesses. Visit Routehub.com to see more useful information.

Part I



Last Updated on Wednesday, 17 March 2010 00:08
Written by CiscoNET   
Saturday, 13 March 2010 17:24

So slow Internet connection after scheduled maintenance on upstream provider(ISP). It could be multiple reasons such as software issue, hardware failure, bad patch cable , dirty fiber and trunk issue. Those are very rare case. Lately I noticed more trouble with MTU mis-setting on backbone routers. When ISP expends their backbone trunk, they put TenGigE card instead of SONET in these days. No wonder why they do that b/c GigE or TenGigE card is much cheaper then SONET card.

Here is common mistake is that the forget to change default MTU size(1500) of the fresh card from the box. Most of ISP set MTU on their backbone as upto 9180 or at least bigger than 1524 bytes (due to VLAN tag for internal use). Again, this is very rare case, but it happens. See how to verify MTU size wrong in the ISP backbone.



Last Updated on Tuesday, 13 November 2012 08:19
Written by CiscoNET   
Monday, 08 March 2010 22:30

Here is the sample configuration to allow traceroute(Unix or Network devices) and tracert(MS Windows)

"TraceRoute" commands of Unix and Cisco devices send UDP packets, while "TraceRT" commands in MS Windows is sending ICMP packets.
In both cases the returning packets are only ICMP. For "TraceRT".

Cisco Router#
Cisco Router#conf t

Cisco Router(config)#access-list 111 permit icmp any any time-exceeded
Cisco Router(config)#access-list 111 permit icmp any any unreachable or port-unreachable 

If you want to accept ping (ICMP echo-reply), it would be like below

Cisco Router#
Cisco Router#conf t
Cisco Router(config)#access-list 111 permit icmp any any echo-reply ; (ICMP type 0)
Cisco Router(config)#access-list 111 permit icmp any any time-exceeded
Cisco Router(config)#access-list 111 permit icmp any any unreachable or port-unreachable ; (ICMP type 3)

Then, apply WAN Serial interface(in this example)

Cisco Router#
Cisco Router#conf t

Cisco Router(config)#interface serial1/1
Cisco Router(config-if)#ip access-group 111 in

* If you have outbound ACL, you need to allow UDP and ICMP echo. If you have inbound policy, then you don't need below.

Cisco Router(config)#access-list 111 permit UDP any any gt 3000
Cisco Router(config)#access-list 111 permit icmp any any echo ; Echo request (type 8)

 ** If you see below output, it is evidence of missing "time-exceeded (ICMP type 11)"

Cisco Router#tr

Type escape sequence to abort.
Tracing the route to

  1 24 msec 24 msec 8 msec
  2  *  *  *
  3  *  *  *
  4  *  *  *
  5  *  *  *
  6 44 msec 52 msec *
Cisco Router#



Last Updated on Saturday, 13 March 2010 21:59
Written by CiscoNET   
Tuesday, 09 February 2010 15:14

Here is quick guide of "How to restore Firefox default setting"

1. From bottom status bar, click Start > Run and put " firefox.exe -safe-mode "

 restore firefox default setting picture 1


Last Updated on Sunday, 28 February 2010 00:05
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