I am currently seeing packet losses on my traceroute. However, you would get an answer from your ISP tech support; "We don't see any issue on our backbone network at this time". It's a strange enough. Definitely, my output of traceroute shown packet losses and even my expensive monitoring system noticed it as well. They might have a real issue on their backbone, but most of time it is something else (???).
Here is a sample output of traceroute from Internet. Below yellow marker indicated packets dropping on Sprintlink.net. (ATTN:This is just for educational example, below output doesn't means Spintlink had an issue.)
PC node> traceroute 184.108.40.206
1 ee-0-5.1.net.net (x.x.x.x - hided IP) 0.612 ms 0.456 ms 0.351 ms
2 500.POS3-1.GW5.CHI2.ALTER.NET (x.x.x.x - hided IP) 1.340 ms 1.328 ms 1.275 ms
3 0.so-2-0-1.XT2.CHI2.ALTER.NET (220.127.116.11) 1.231 ms 1.375 ms 1.189 ms
4 0.so-5-0-0.XL2.CHI13.ALTER.NET (18.104.22.168) 2.457 ms 2.418 ms 2.387 ms
5 0.so-7-0-0.BR2.CHI13.ALTER.NET (22.214.171.124) 2.413 ms 2.449 ms 2.438 ms
6 sl-st21-chi-3-0-0.sprintlink.net (126.96.36.199) 2.291 ms 2.211 ms 2.433 ms
7 * * *
8 * * *
9 sl-stateil-189071-0.sprintlink.net (188.8.131.52) 3.629 ms 3.804 ms 3.453 ms 10 ge-11-0-voyager2-sob2.chicago.lincon.net (184.108.40.206) 3.439 ms 3.491 ms 3.354 ms
11 pos-6-0-sob2-sob1.chicago.lincon.net (220.127.116.11) 8.100 ms 8.086 ms 9.308 ms
12 * * *
13 POS-4-0-satriani-peo-p1-petrucci-peo-p2.lincon.net (18.104.22.168) 75.234 ms 21.367 ms 8.376 ms
Last Updated (Tuesday, 19 May 2009 16:15)
STG is stand for SNMP Traffic Grapher. This is a well-known free real-time monitoring SNMP tool for quick real-time bandwidth monitoring. It was coded by Leonid Mikhailov. Yes... Yes... it's old, but it works out pretty well. If you feel slow Internet access, you might want to check your WAN link bandwidth in real-time which might be maxed out in any reason. Most of router stat provides minimum 30 second interval which doesn't provide details of bustable traffic patterns occurred in 5~6 seconds. To simply check your real-time bandwidth this is one of way. Again, it's free.
Download the file from http://cisconet.com/downloads/stg.zip
** If you cannot down load the file, probably your IE browser is blocking it. Use firefox or Copy & paste http://cisconet.com/downloads/stg.zip on your browser.
See below what you need to do
Last Updated (Wednesday, 02 December 2009 00:50)
Since I introduced a tiny bandwidth monitoring tool a while ago, people ask me how to find OID (Object Identifiers) that is uniquely identify managed objects in a MIB hierarchy from the device they want to monitor. Good question, if you are not familiar with SNMP and MIBs stuff, probably you will spend hack of time to find the OIDs. Actually, there are many way to fine those, but here is simple way to find it. You need to down load some free utility that is called "SNMPtester" from www.paessler.com or click icon
Check this after this article "Quick real-time bandwidth monitoring by SNMP Tool - STG"
1. Download "SNMPtester" and unzip it.
2. Click icon
3. Put below information
(1) Set SNMP Settings
Local IP : Any
4. You can see scanned list of ports and OID # on right hand side of the window. I believe you already got some idea, as soon as you see the outpput.
Testing standard interfaces...
As I mentioned on other article "Quick real-time bandwidth monitoring by SNMP Tool - STG"
22.214.171.124.126.96.36.199.1.10.1 - Green OID
10 = inbound traffic (MIB OID = ifInOctets)
I hope this is informative for you.
Last Updated (Friday, 23 October 2009 21:38)
Wireshark's display filter expression syntax is quite useful. The filter is applied to a capture file, when the file has been created. It only displays packets which are matched on filter expression syntax. It is a powerful option, but not for beginner.(Sorry) Dialog type expression filter would be easier, but once used to it. You won't back to dialog type of filter option. Here is a collection of expression syntax options were frequently used.
Last Updated (Friday, 22 May 2009 19:02)
I would like to introduce a little gadget today for network administrators or someone is interesting about pulling information from your network gears. Last time I introduced old gadget, is called stg snmp tools, but it is very useful and powerful enough when you are troubleshooting your WAN or LAN link in real-time. It is a nice tools, but for the user who is not familar with MIB. Finding OID information would be the difficult part for them. No pain, No gain.
However, I bring some good news for those users today. Free OID tracker, it is called dVUE5X that is developed by SYS Technologies
dVUE5X is a powerful desktop utility that allows you to connect to any SNMP device and easily track a selected SNMP MIB-II object. You can choose from over 180 standard SNMP MIB-II objects, giving you the flexibility to quickly monitor and troubleshoot potential device problems ranging from interface performance to packet processing.
Last Updated (Friday, 08 May 2009 15:17)
Most of Internet users (I met) are a bit confused about meaning and definition of Throughput and Bandwidth. If you are non-computer person or just happy with Internet connectivity, probably those terms, throughput and bandwidth, are in out of your sight. However some people who are living with e-commers field, Stock trader, most of IT professionals are really sensitive for downloading speed. Size of Internet and backbone speed is quickly upgraded day by day. I heard one of tier1 ISP, Verizon, provides 40Mbps download and 20Mbps upload Fios service for business. Furthermore, price is really competitive.
Anyway, if you have a high speed broadband or serial links (DS3, OCs and Metro Ethernet) for Internet, do you believe maximum is same as your subscribed Internet speed? In another word, if you have DS3 45Mbps (bandwidth) link to ISP, do you think you will get 45Mbps downloading speed? or TCP throughput, when you or transferring data to other location? Most of people might say, of course that's what I am paying for. However answer is "Yes" and "NO". Let's figure why that is!
Last Updated (Saturday, 07 November 2009 22:06)