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network management with cisco

dmalamba
Level 1
Level 1

I have a wide area network comprising of 2 cisco

2600 series routersconneceted by their ethernet

port and 12 cisco 1601 and cisco 1721 routers

stationed at my remote sitesthings have been working

ok for about three years nor.But when I started

conecting the my 13th, 14th and 15th sites I started

experincing complete network diruption both on the Main

LAn and the wide area network. It seems from the look

of things that my main billing server, which is an

IBM setfity server running windows NT 4.0, is getting

problem handling the network traffic since when i remove

the machine from the network the network get up again.

So I dont know know where to start troubleshooting.Is there

any free software which I can use to monitor traffic, traffic

type or any other tool which I can use to isolate this problem

further so thatb i can find a solutioin to my problem?

Below are the configuration files of my two Cisco 2600

series routers:

==

Cisco_2611_IT#sh conf

Using 3118 out of 29688 bytes

!

ve

service config

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname Cisco_2611_IT

!

enable secret

enable password

!

ip subnet-zero

ip host salima 192.168.112.99

ip host Limbe 192.168.10.26

ip host BlantyrePayPoint 192.168.10.1

ip host MaselemaPayPoint 192.168.10.5

ip host LimbePayPoint 192.168.10.25

ip host Blantyre 192.168.10.2

ip host Zomba 192.168.10.22

ip host Mzuzu 192.168.30.30

ip host mangochi 192.168.30.22

ip host LilongweOldTown 192.168.10.14

ip host LilongweCityCentre 192.168.10.18

ip host Maselema 192.168.10.6

!

!

!

interface Ethernet0/0

ip address 192.168.100.207 255.255.255.0

no ip directed-broadcast

ip nat inside

!

interface Serial0/0

description Connecting MTL Head Office(Maselema)

bandwidth 64

ip address 192.168.30.6 255.255.255.252

ip directed-broadcast

ip nat inside

no ip mroute-cache

!

interface Ethernet0/1

ip address 192.168.240.1 255.255.255.0

no ip directed-broadcast

ip nat inside

bridge-group 1

!

interface Serial0/1

description Connecting Salima Customer Care Centre

ip address 192.168.30.9 255.255.255.252

no ip directed-broadcast

ip nat inside

no cdp enable

!

interface Serial1/0

description Connecting Ntcheu CCC

ip address 192.168.40.6 255.255.255.0

no ip directed-broadcast

ip nat inside

no cdp enable

!

interface Serial1/1

description Connecting Kasungu CCC

ip address 192.168.10.16 255.255.255.0

no ip directed-broadcast

ip nat inside

no cdp enable

!

interface Serial1/2

description Connecting Leland Internet Gateway

ip address 10.10.10.2 255.255.255.0

no ip directed-broadcast

ip nat outside

no cdp enable

!

interface Serial1/3

description Connecting Ngabu CCC

ip address 192.168.40.11 255.255.255.0

no ip directed-broadcast

ip nat inside

no cdp enable

!

router rip

version 2

no validate-update-source

redistribute connected

network 10.0.0.0

network 62.0.0.0

network 128.1.0.0

network 192.168.10.0

network 192.168.30.0

network 192.168.40.0

network 192.168.100.0

network 192.168.113.0

network 192.168.116.0

network 192.168.117.0

network 192.168.240.0

neighbor 10.10.10.1

!

ip nat pool Internet_Access netmask 255.255.255.248

ip nat inside source list 101 pool Internet_Access overload

ip nat inside source static 128.1.0.1

ip nat inside source static 192.168.100.8

ip nat inside source static 192.168.100.254

ip nat inside source static 192.168.100.10

ip classless

ip route 0.0.0.0 0.0.0.0 10.10.10.1

!

dialer-list 1 protocol ip permit

dialer-list 1 protocol ipx permit

snmp-server community public RO

bridge 1 protocol dec

banner motd ^C

!

line con 0

exec-timeout 0 0

logging synchronous

transport input none

line aux 0

line vty 0 4

password xxxxx

login

!

end

Cisco_2611_IT#

===========

Thanks in advance

1 Reply 1

Hello,

are you saying that when you disconnect the NT server, your network is ok even with the additional sites connected ? You might want to try and turn on ip accounting first on the interface where the NT server is connected to, in order to find out which source address is sending the traffic to your NT serverm, or where your NT server is sending the traffic. To configure this on e.g. your Ethernet0/0 interface, add the following to the interface configuration:

ip accounting

ip accounting output-packets

You can then view the source and destination address pairs with the command:

show ip accounting

There is a free tool called MRTG which allows you to monitor interface load, go to www.mrtg.org for further information. You could also use a sniffer to verify the source of your problems, there is a free one available at www.ethereal.com.

HTH,

GP

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