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Unable to set up network infrastructure. Help needed

Lechanna
Level 1
Level 1

Hi all,

I am working on a lab that requires me to set up a complex network and I am having connectivity issues.

For more context, the network requires me to use 4 layer 3 switches and 2 4321 cisco routers. I was given the private network 10.35.4.0/22 and have split it into 5 sub-networks, with subnet 1's network address starting with 10.35.4.128/25 and continuing on until subnet 5's network address, which starts with 10.35.6.128/25.

Additionally, I had to create 3 VLAN's and assign 2 computers to each vlan. Moreover, a separate VLAN called "Management" is assigned ports 1-9, whereas the other 3 VLAN's are randomly assigned ports 10-24.

I must also set up DHCP on the end devices with the router being the DHCP server, enable port security, configure dynamic NAT, etherchannels between the switches, and use OSPF and STP.

Lastly, I was given a server as well as an IP address to connect to it via a router with the following information to help me connect to the internet:

Router IP Add to server: 172.16.161.10;   

Server Ip config:  Default-Gate: 172.16.160.1;   Subnet: /20;   DNS: 172.16.160.102.

With these requirements in mind, I believe I have the majority of the commands implemented into my network. However, I am still having connectivity issues and I am not sure what to do next. My end goal is to be able to ping from any end device to any other device within the network, as well as access the internet from any end device. Additionally, I have attached both a word document of my running configurations, as well as a screenshot of my packet tracer to help visualize my entire network. Lastly, I am unable to add my packet tracer as the file does not seem supported but if there is a way I am willing to add it for clarity. 

8 Replies 8

Martin L
VIP
VIP

You can share your what-u-got-so far PT file here but file must be in a zip format. then we can spot errors/mistakes; give u some pointers.

Regards, ML
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Thank you for the tip. Here is the zip file of my packet tracer.

Martin L
VIP
VIP

PCs are not getting IPs 'cause no way to get to router who servers as DHCP pool.  Link Sw1 to R1 must be either trunk for both vlans or access mode for vlan 10 or access for vlan 30.  if u change fa0/1 into access vlan 10, then renew IP for PCs in vlan 10, they will get IPs.  Howerver, PCs in vlan 30 will not.  for all PCs in vlan 30, make sure they can reach R2 with access port R2 to Sw2 in vlan 30.

There is alternative way with ROAS where R1 has sub-interfaces: one for vlan 10 and one for 30.  I have not looked at doc yet; not home, so where is DHCP for vlan 30 ? or where it should be  ?

Regards, ML
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Martin L
VIP
VIP

I think this ROAS make more sense (for PCs in vla 10 and 30 to get IPs from R1)

interface GigabitEthernet0/0/1

description R1 to SW1

!

interface GigabitEthernet0/0/1.10

encapsulation dot1Q 10

ip address 10.35.5.1 255.255.255.128

!

interface GigabitEthernet0/0/1.30

encapsulation dot1Q 30

ip address 10.35.6.1 255.255.255.128

 

Also R1 has a typo in pool for vlan 3 or 30

Regards, ML
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One error on my part is that all vlans labeled "1", "2", or "3" should all have a 0 after it. I.e. vlan 1 = vlan 10; vlan 2 = vlan 20; vlan 3 = vlan 30.

Additionally, I implemented the ROAS changes you recommended to R1, and I also made fa0/1 from S1 to R1 a trunk interface on VLAN 99, allowing vlans 10,20,30 and 99 to go through. However, even with these changes, PC1 was still unable to get an ip address from the DHCP server (R1).

works for me; 2nd or 3rd try as STP switchports must convert; Fix DHCP on R1, then compare to my settings

ip dhcp pool VLAN1

network 10.35.5.0 255.255.255.128

default-router 10.35.5.1

dns-server 172.16.160.102

ip dhcp pool VLAN3

network 10.35.6.0 255.255.255.128

default-router 10.35.6.1

dns-server 172.16.160.102

!

interface GigabitEthernet0/0/1

description R1 to SW1

no ip address

ip nat inside

duplex auto

speed auto

!

interface GigabitEthernet0/0/1.10

encapsulation dot1Q 10

ip address 10.35.5.1 255.255.255.128

!

interface GigabitEthernet0/0/1.30

encapsulation dot1Q 30

ip address 10.35.6.1 255.255.255.128

!

Sw1 settings

interface FastEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

switchport nonegotiate

!

Try, I saved my PT file; if u cannot fix it, i will upload mine

Regards, ML
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Sorry to bother you but would you be able to show your PT file? I'm still having issues with my configuration even after resetting the switch and router multiple times.

I tested top PCs are OK, not sure about bottom ones

 

Regards, ML
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