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You haven't attached your router configuration. &nbsp;But I would firstly check the subnet address on the router is also 255.255.252.0.
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You haven't attached your router configuration.  But I would firstly check the subnet address on the router is also 255.255.252.0.

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I found my fault in configuration i give 0.0.1.255 wild card in extended list hundred i change it to 0.0.3.255 wild card <br />
thanks
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I found my fault in configuration i give 0.0.1.255 wild card in extended list hundred i change it to 0.0.3.255 wild card
thanks

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i have a dhcp pool in cisco router 2811<br />
&nbsp;ip dhcp pool ccp-pool1<br />
import all<br />
&nbsp; &nbsp;network 192.168.48.0 255.255.252.0<br />
&nbsp; &nbsp;dns-server 208.67.222.222 208.67.220.220<br />
&nbsp; &nbsp;default-router 192.168.48.1<br />
&nbsp; &nbsp;lease infinite<br />
<br />
&nbsp;No there ip of 192.168.48.0 and 192.168.49.0 series can ping 192.168.48.1 and access internet but when get ip in the series of 192.168.50.0 they cannot ping default gateway 192.168.48.1 and also cannot access internet. &nbsp;however in dhcp lease defult gateway show 192.168.48.1.<br />
<br />
i attach my router configuration as attachment <br />
<br />
please tell me where i am wrong<br />
<br />
and provide the correct command or access-list<br />
thanks
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i have a dhcp pool in cisco router 2811
 ip dhcp pool ccp-pool1
import all
   network 192.168.48.0 255.255.252.0
   dns-server 208.67.222.222 208.67.220.220
   default-router 192.168.48.1
   lease infinite

 No there ip of 192.168.48.0 and 192.168.49.0 series can ping 192.168.48.1 and access internet but when get ip in the series of 192.168.50.0 they cannot ping default gateway 192.168.48.1 and also cannot access internet.  however in dhcp lease defult gateway show 192.168.48.1.

i attach my router configuration as attachment 

please tell me where i am wrong

and provide the correct command or access-list
thanks

specific serief of dhcp user not access internet and defualt gatway

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).