DHCP vlan trouble

[kostiantyn-shai]

Hello, can anyone help me with a DHCP problem when I try to configure my PCs VLAN20 . This is for my term paper . I lost a lot of time trying to fix it myself. My computers are not getting ip addresses through DHCP and also I can't ping other vlans!

[Royalty]

Hi @kostiantyn-shai,

If you wish to share a topology diagram (prtscrn from PT is fine) and running-config of each node then I personally would be happy to help you with some pointers of what to look out for and suggest next steps. I don't have PT on at the moment. I'll not give the answers directly though! 

[M02@rt37 · Accepted solution]

Hello @kostiantyn-shai 

The issue is on Router1 interfaces.

You cannot configured IP ADD on sub-interfaces Fa0/1.10 (dot1q 10) and Fa0/1.20 (dot1q 20) since Fa0/0.10 and Fa0/0.20 has got one ! You have an overlap warning if you do that. Router cannot have same subnet on different interfaces.

So review the topology. Don't connect Switch1 to Router1, but connect Switch1 to Switch0 with a Trunk port. After that, PCs attached to Switch1 should have connectivty to their respective Gateway hosted on Router1 (througth Fa0/0.10 Fa0/0.20 etc ....)

[kostiantyn-shai]

I made as u said and it worked  but now i cant communicate with Vlan40 (AP (wifi laptops)) and Vlan30 my servers. Could u please help me with that)?