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Network Infrastructure and Bandwidth VS Cameras

Posted on 2009-07-11
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Last Modified: 2012-05-07
Hello Experts
I'm working for an office who has about 40 PCs connected in several sites (4) and all these sites are quite close to eachother and they are in the same scope "192.168.0.1 to 192.168.0.254".

These sites are using ADSL connection, 20 of the PCs are using ADSL 1 as GATEWAY A, the other 20 are using ADSL 2 as Gateway B.
Gateway A is 192.168.0.1, Gateway B is 192.168.0.100, This has worked for about a year now without any problem...

My first question is, After my boss has requested one company to come and install Cameras for monitoring all the 4 sites, The PCs which are working on gateway B started to have many connectivity issues with the Printer, Internet, Local Network Browsing..etc

I noticed after 2 weeks of investigating this problem that when there's internet, the ping command will reply with the following report

C:\Users\moh10ly>ping -t 192.168.0.1

Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64

Note The TTL is 64 here, And when there's no connection to the printer or internet the ping command report the following

C:\Users\moh10ly>ping -t 192.168.0.1

Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time=2ms TTL=100
Reply from 192.168.0.1: bytes=32 time=4ms TTL=100
Reply from 192.168.0.1: bytes=32 time=1ms TTL=100
Reply from 192.168.0.1: bytes=32 time=2ms TTL=100

The TTL is 100

I'm wondering if the Cameras has anything to do with these problems... !??? Does anyone had this issue before?

The second question is,, How do I let all the clients look through the network to find internet in one of the gateways (routers).
Should I enter both IPS as DNS ? 192.168.0.1 and 192.168.0.100?

Thanks for your help


And when there's no connection to the Printers, Internet ... The ping command will
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Question by:Mohammed Hamada
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by:Bing CISM / CISSP
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> an office who has about 40 PCs connected in several sites (4) and
> all these sites are quite close to eachother and
> they are in the same scope "192.168.0.1 to 192.168.0.254".

how do your two sites connect with each other *physically*? by a switch?

> I'm wondering if the Cameras has anything to do with these problems..

TTL stands for Time To Live. it tells the hosts along the route how long the ICMP package is expected to be kept, in turn to prevent the package running in an infinite loop. every time a host receives a PING package, it decrements the TTL counter by one. in case of the TTL reaching zero, the host discards the package.

it seems you were PINGing from a PC on the LAN, as the "time" was always less than 4ms. so i think there was nothing to do with TTL there.

> one company to come and install Cameras for monitoring all the 4 sites

what kind of cameras did they install? webcams that can be monitored over LAN/WAN?
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by:Mohammed Hamada
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Hello Bbao and thanx for your reply

Actually they are not 2 sites they are 4 offices but to just limit and to not complicate things I've mention only 2 sites...
but these 4 offices are one company and they are located in the same area, eachone is about only 100 meters to 300 meters maximum far.

The main center has about 25 Pcs the others has about 15 divided into 3 offices, and these are all connected through Switches.. 2 switches are in the main office.. the others are connected through (3com routers & small Switches) which are connected to the switches in the main office.

The weird thing here about the TTL is that when there is connection in the computers which has the gateway 192.168.0.100, the ping command will give a read 64 for TTL.. but when these clients lose connection to internet and printers the TTL will turn into 100..

I'm not sure what are the camera brands or where they are installed, but as long as I know that these cameras are recording hour by hour everything in the 4 offices, each office has 2 cameras and the main office has about 6 to 8 Cameras..

I've been told from the previous IT tech guy that the cameras were installed and using the 192.168.0.100 gateway.
Tomorrow I will meet with the person who is responsible for installing cameras and I will get more information.

if anyone has any useful ideas about this please let me know.
Thanks alot
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by:Bing CISM / CISSP
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> 2 switches are in the main office..
> the others are connected through (3com routers & small Switches)
> they are in the same scope "192.168.0.1 to 192.168.0.254".

are you using any router to connect the office LANs? in my understanding, there is NO routers involved, and all hosts are in the same subnet 192.168.0.0/24.

> these cameras are recording hour by hour everything in the 4 offices

the key is: do they transfer the real-time video over the LAN?
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by:Mohammed Hamada
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We are using 3 routers ( two 3com routers & one Linksys router).
First 3com router is set to IP 192.168.0.1, Second is set to 192.168.0.100, third is set to 200.

Today I met with the Camera responsible Tech, and I understand that he was using cameras to record in these four offices locally ... all these cameras are using the IP 192.168.0.100 as their gateway.

I've instructed this person to use the third router (linksys) as cameras gateway, as it also has Dynamic DNS for dyndns.com for real-time video... which was only configured today, becoz there's also another office in a different Site that will have a monitoring system connected to the main office as well.

After trying and testing the ping, there was no change.. but what i've done is changing the IP address of the second 3com router which is 192.168.0.100 to 192.168.0.210. and internet is working well.

I'm not sure if this will last, but i'll just leave it for few days ... Apparently the Dyndns.com or gateway has something to do with this problem.

Any other comments?
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Mohammed Hamada earned 0 total points
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Managed to solve this issue...
I've changed the router IP from 100 to 210 and disconnected computers from this gateway then connected them to the other 2 routers which helped to get rid of this problem.

Thanks again
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