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created a scope 192.168.11.0 on the dhcp. the computers get the ip in the 11 range but cannot access internet and shared drives

Posted on 2008-09-30
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Last Modified: 2012-05-05
The ip range 192.168.10.0 is full on the dhcp, so i created a new scope (192.168.11.0).I included both ip ranges into a superscope.Also i added the details in the router's access list. New computers joining the domain get the ip in the 11.0 range but still they cannot access the internet and neither the shared drives and printers.What could be the problem?I s there another step which i missed?
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Question by:ROD28
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7 Comments
 
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JFrederick29 earned 500 total points
ID: 22604471
Something needs to provide routing between subnets or you need to change the subnet mask on the router interface, DHCP scope and clients to 255.255.254.0?  What type of router?  If Cisco, you can apply the 192.168.11.0/24 subnet as a secondary address to the LAN interface.

int fa0/1
ip address 192.168.11.1 255.255.255.0 secondary
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Author Comment

by:ROD28
ID: 22604556
The router/firewall is Cisco T801. Attached i enclosed the router config for your information.I added the new ip range in the 140 access list as highlighted in the attachments.Thanks
Router-config.pdf
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Expert Comment

by:JFrederick29
ID: 22604589
Add the 192.168.11.0/24 subnet as a secondary on the VLAN2 interface.

conf t
int vlan2
ip address 192.168.11.1 255.255.255.0 secondary

Make sure 192.168.11.1 is the default gateway for the 192.168.11.x clients.
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Expert Comment

by:JFrederick29
ID: 22604679
Looks like your access-list also is missing statements to allow the 192.168.11.0/24 hosts to resolve DNS externally and allow ICMP like the .10 subnet.

conf t
access-list 140 permit udp 192.168.11.0 0.0.0.255 any eq domain
access-list 140 permit icmp 192.168.11.0 0.0.0.255 any
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Expert Comment

by:Mysidia
ID: 22604753
Unless you have multiple subnets in the .10  scope, or a logical reason
for this subnet division; I would suggest thinking of using one DHCP scope
instead of 2.   You can define 2 pools in the scope,  one for some ips in the .10
range and one for some ips in the .11 range

192.168.10.0   as a /23   i.e. with netmask     255.255.254.0  
instead of 255.255.255.0
(use one big pool instead of 2 pools)

Change the subnets accordingly on your domains.

A downside is any devices with a static IP now also need the netmask updated
to 255.255.254.0


The disadvantage is the change may be harder;  the advantage is, going
forward, administration of one subnet is simpler than administration of two subnets.

Also, you can keep a simpler router configuration

permit udp 192.168.10.0        0.0.1.255   any eq domain
instead of

permit udp 192.168.10.0   0.0.0.255 any eq domain
permit udp 192.168.11.0   0.0.0.255 any eq domain

*Well,  given the limitations of  RIPv1, you appear to have in
that conf, you still need to advertise  two class C  networks.


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Expert Comment

by:dkarpekin
ID: 22605000
You should considere chage everything to bigger subnet- like 10.10.0.0 on 255.255.0.0 will ive you 65k adresses, group then lagicaly:
10.10.0.1-10.10.0.255  -servers darm
10.10.1.0-10.10.1.255 -office users
10.10.1.0-10.10.1.255 -contractors
10.10.1.0-10.10.1.255 -VPN users
10.10.1.0-10.10.1.255 -guests

and so on. much easy managed then
And have VLAN's set up

Something like this
http://netgear.com/Products/Switches/FullyManaged10_100_1000Switches/GSM7212.aspx
genral info
http://netgear.com/Solutions/BusinessSolutions/MainOffice.aspx

Some example VLAN usage you can find on EE, Cisco web or many others.............

http://www.tomax7.com/mcse/vlan_made_easy.htm

Of cause Cisco is top of the line,but Netgear might be more suitable for you.
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Expert Comment

by:dkarpekin
ID: 22605020
Sorry ,did not typed correctly......
10.10.0.1-10.10.0.255  -servers farm
10.10.1.0-10.10.1.255 -office users
10.10.2.0-10.10.2255 -contractors
10.10.3.0-10.10.3.255 -VPN users
10.10.4.0-10.10.4.255 -guests
...........................................
and so on
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