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Tips Fer Network
Trubbleshootin’
• TIP 1 – Getting’ Yer New Assignment Effective Communicashun Skills
Typos and Spelling Errors
• "Thank you for your prayerful
consideration. Hope to hear from you
shorty!"
• "I am a quick leaner, dependable, and
motivated."
• "I worked as a Branch Lesion."
• "Work Experience: Dealing with
members' conflicts that arouse."
• “Attended SIL, August 1880 - May
1983."
Poor Wording
• "Here are my qualifications for you to
overlook."
• "You will always find me to be an
extremely trying person"
• "I will take the chaos of your branch
administration and reform it into a
semblance of simple disorder"
Poor Wording
• "I perform my job with effortless
efficiency, effectiveness, efficacy, and
expertise."
• "Objective: To have my skills and
ethics challenged on a daily basis."
• "Seek challenges that test my mind
and body, since the two are usually
inseparable."
Did You Really Mean to Say That?
• "Personal Goal: To hand-build a classic
cottage from the ground up using my
father-in-law."
• "It's best for branches that I not work
with people."
Did You Really Mean to Say That?
• "If this letter of reference doesn't blow
your hat off, then please return it in the
enclosed envelope."
• "Reason for leaving last assignment:
Pushed aside so the Branch Director’s
wife could steal my job."
Did You Really Mean to Say That?
• "Exposure to German for two years,
but many words are inappropriate for
ministry use."
• "Excellent memory; strong math
aptitude; excellent memory; effective
management skills; and very good at
math."
Did You Really Mean to Say That?
• "Accomplishments: Completed 11
years of high school."
• "Graduated SIL in the top 66% of my
class."
Tips Fer Netwerk
Trubbleshootin’
• TIP 1 – Getting’ Yer New Assignment Effective Communicashun Skills
• TIP 2 – Think & Trubbleshoot in “Layers”
Application
OSI Layers
Presentation
Session
Transport
Network
Data Link
Physical
OSI
Layer
Apple
Computer
Banyan
Systems
Session
Layer 5
AppleTalk
Filing
Protocol
(AFP)
AppleTalk
Session
Protocol
(ASP)
Remote
Procedural
Calls
(Net RPC)
Transport
Layer 4
AppleTalk
Transaction
Protocol
(ATP)
Network
Layer 3
Datagram
Delivery
Protocol
(DDP)
VINES
Internet
Protocol
(VIP)
Physical
Layer 1
Network
Management
Network
Application
Session
VINES
InterProcess
Communicatio
ns
(VIPC)
Data Link
Layer 2
IBM
SNA
Microsoft
Networking
Novell
NetWare
TCP/IP
Internet
Xerox
XNS
OSI
Protocols
Application Programs and Protocols
for file transfer, electronic mail, etc.
Application
Layer 7
Presentation
Layer 6
DEC
DECnet
End
Communica
tions
Routing
Transacti
on
Services
Presentati
on
Services
Data
Flow
Control
Transmis
sion
Control
Path
Control
Server
Message
Block/Commo
n Internet
Filing System
(SMB/CIFS)
Network
Basic
Input/Output
System
(NetBIOS)
Network
Basic
Extended
User
Interface
(NetBEUI)
NetWare
Core
Protocols
(NCP
Network
Basic
Input/Out
put
System
(NetBIOS)
(Telnet, FTP,
SMTP, etc.)
Control
and
Process
Interac
tion
ISO
8823
ISO
8327
Sequenced
Packet
Exchange
(SPX)
Transmission
Control Protocol
(TCP),
Unacknowledged
Datagram
Protocol (UDP)
Sequenc
ed
Packet
Protocol
(SPP)
ISO
8073
TP0-4
Internet
Packet
Exchange
(IPX)
Internet
Protocol
(IP)
Internet
Datagra
m
Protocol
(IDP)
ISO
8473
(CLNP)
NIC Drivers: Open Datalink Interface (ODI), Network Independent Interface Specification (NDIS)
Network Interface Cards: Ethernet, Token-Ring, ARCNET, StarLAN, LocalTalk, FDDI, ATM, etc.
Transmission Media:
Twisted Pair, Coax, Fiber Optic, Wireless Media, etc.
Vendor Protocols
Simplified Layers
Layers 5-7 Application
Layer 4
Transport
Layer 3
Network
Layer 2
Data Link
Layer 1
Physical
HTTP, POP3, SMTP
TCP/UDP/ICMP
IP
LAYER 1 (Twisted Pair) TESTING
Test
Method
Basic continuity
Progressive Electronics 700C
Detailed continuity
Siemens STM-8
Fluke MicroMapper
Shorts/opens
reversed pairs
Integrity
length
near end crosstalk
far end crosstalk
Fluke DSP-4000
Microtest OMNIScanner
LAYER 1 (Fiber Optic) TESTING
Test
Method
Basic Continuity
Detailed Continuity
Kmart flashlight
Corning OS-100D
Attenuation
Integrity
DB loss
breaks, defects, misalignments
length
reflection
Corning 240 OTDR
LAYER 1 (Wireless) TESTING
Test
Method
RF power
RSSI signal levels
Packet Error Rate
Berkley Varitronics
Berkley Varitronics
http://www.bvsystems.com/
LAYER 1 (Wireless) TESTING
Test
Method
RF power
RSSI signal levels
Packet Error Rate
Berkley Varitronics
LAYER 2 (Ethernet) TESTING
Test
Method
Link
Link Light
Manufacturer’s Diagnostic
Driver
Device Manager
Local Area Connection Status
LAYER 3 (IP) TESTING
IPCONFIG
PING/PATHPING/TRACERT (by IP address)
ARP
NETDIAG
ROUTE
LAYER 4 (TCP) TESTING
NETSTAT
TELNET X.X.X.X YY
X.X.X.X is a known good IP address
YY is a known good port number
Firewall issues
show up at this
layer
LAYERS 5-7 (HTTP) TESTING
TELNET X.X.X.X 80
GET /
“GET” is case
sensitive.
LAYERS 5-7
(SMTP) TESTING
TELNET X.X.X.X 25
HELO
MAIL FROM: [email protected]
RCPT TO: [email protected]
DATA
This is a test.
.
Period on a line by
itself followed by
<RET> indicates “This
is the end of the
message.”
LAYERS 5-7
(POP3) TESTING
TELNET X.X.X.X 110
USER YourPOP3Username
PASS YourPOP3Password
LIST
RETR X
LAYERS 5-7 (FTP)
TESTING
FTP X.X.X.X
YourFTPUsername
YourFTPPassword
LS
(to see a file listing)
CD XXX (XXX = directory name)
BIN
(to enable BINary transfer)
HASH
(to enable progress bar)
GET XXX (XXX = filename to download)
LAYERS 5-7 (DNS)
TESTING
NSLOOKUP
SERVER X.X.X.X
Hostname.Domain.Com
Tips Fer Netwerk
Trubbleshootin’
• TIP 1 – Gittin’ Yer New Assignment Effective Communicashun Skills
• TIP 2 – Thinkin’ & Trubbleshootin’ in
“Layers”
• TIP 3 – Understandin’ & Trubbleshootin’
Name Resolution
NetBIOS
Name Resolution Methods
Method
To View
To Delete
To Add
NetBIOS
cache
NBTSTAT –c
NBTSTAT –r
NBTSTAT -R
(dynamic)
WINS
WINSMGMT.MSC
WINSCL (Res Kit)
WINSMGMT.MSC
WINSCL (Res Kit)
WINSMGMT.MSC
NBTSTAT –RR
WINSCL (Res Kit)
LMHOSTS
NOTEPAD
NOTEPAD
NOTEPAD
Broadcast
N/A
N/A
N/A
HOST
Name Resolution Methods
Method
To View
To Delete
To Add
DNS cache
•IPCONFIG
/DISPLAYDNS
•IPCONFIG
/FLUSHDNS
(dynamic)
•DNSCMD
DNS server
•DNSMGMT.MSC
•DNSCMD
•NSLOOKUP
•DNSMGMT.MSC
•DNSCMD
•IPCONFIG
/REGISTERDNS
•DNSCMD
HOSTS file
NOTEPAD
NOTEPAD
NOTEPAD
Tips Fer Netwerk
Trubbleshootin’
• TIP 1 – Gittin’ Yer New Assignment Effective Communicashun Skills
• TIP 2 – Thinkin’ & Trubbleshootin’ in
“Layers”
• TIP 3 – Understandin’ & Trubbleshootin’
Name Resolution
• TIP 4 – Identifyin’ Firewall Issues
http://WWW.ACME.COM:8080/DEFAULT.HTM
TELNET WWW.ACME.COM 8080
CTC04
To be sung to the tune of
O, Susanna
Oh I took a plane to Waxhaw
Recurrency to take!
And through the many sessions
I have barely stayed awake.
There is one session that I love
- look forward to the most!
It is the one with candy
Thrown by the nerdy host!
Chorus
Trubbleshootin’
Oh, who could ask for more?
And I got all this and candy
All at CTC04.
When getting an assignment
My skills I should reveal
But careless choices of my words
Can make or break the deal
When I am writing letters that
Describe my current work
I best take care that they do not
Make me look like a jerk.
Chorus
Trubbleshootin’
Oh, who could ask for more?
And I got all this and candy
All at CTC04.
I know to think in layers when
The network isn’t right
and if my fiber needs a check
I’ll get out my flashlight.
I know to test my Layer 2
If Layer 3 is sick
And testing Layer 3 is when
a PING will do the trick.
TELNET is the tool of choice
When email’s on the fritz
A quick TELNET to port 110
Will help me keep my wits!
And when I get a problem that
I cannot seem to solve
To check NetBIOS/DNS
To see if they resolve.
When I am testing open ports
It’s TELNET, I’ll recall
That tests to see if packets
All get through the firewall.
The trip to Waxhaw – it was good
I trubbleshot & more
But the best thing was the CANDY!
at CTC04.
Chorus
Trubbleshootin’
Oh, who could ask for more?
And I got all this and candy
All at CTC04.
This presentation available at:
WWW.GRISWOLD.COM/SIL