Re: Seeking LAN Setup advices

helim <[email protected]>
Newsgroups gmane.user-groups.linux.singapore
Message-ID <[email protected]>
Thanks Martin.

Can the CISCO 877 Router (with build-in ADSL modem) act as firewall 
also? It has 4 ports but only one is used now. The router's password is 
controlled by M1 because we have no System Administrator. From your 
suggestion, I shall buy another wifi router+switch connects to one port 
of CISCO 877 and then connect a 24-port switch to the wifi router+switch 
and do the same for staff sub-net. In this case the 2 sub-nets are 
isolated by the wifi router+switch and the result is the PCs in 
student/public sub-net cannot access server and PCs in staff sub-net and 
vice versa. Is my understanding correct?

Shall I worry about the speed accessing Internet will be slower due to 
one additional router being added as I notice the wifi speed is always 
much slower than the fixed line connection (I use 
http://www.bandwidthplace.com/ to test speed and the wireless speed is 
normally 50% slower). What is the normal delay expected when one 
additional router is added? The wifi router+switch we are using now is 
Linksys WRT310N. Any suggestion of better make and model?

TIA

Lim Hua Eng

Martin Bähr wrote:
> On Wed, Apr 28, 2010 at 12:00:40PM +0800, helim wrote:
>   
>> Currently my office LAN setup is one common network for both office 
>> staff and the PCs in Computer Lab. We also have a Linksys WRT310N 
>> wireless router which is only for staff but we want to install another 
>> wireless router for students. The broadband is provided by M1 Connect 
>> (originally by Qala which was acquired by M1 last year) with 2MBPS fix 
>> IP with CISCO 877 router with ADSL function. I would like to 
>> re-configure the LAN to separate into 2 sub-nets such that the staff's 
>> sub-net is better protected from potential access by students or 
>> visitors. Can any experienced network experts provide some advice? Thank 
>> you very much.
>>     
>
> does not seem to complicated (in theory), you need to physically seperate
> the two networks and put a firewall between them.
>
> how easy the physical seperation is depends on your office layout.
>
> in general:
>
> internet---firewall(cisco)---wifi router+switch---lab computers
>                 |
>      wifi router+switch
>                 |
>          staff computers
>
> i have a similar (more complex) setup using linux and iptables
>
> greetings, martin.
>   


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