12-27-2013 08:23 PM - edited 03-04-2019 09:57 PM
hello ive been running into a serious problem with my router. Im inexeperienced with cisco routers and learned a little bit in college. What i was wondering was how to get the internet to my computer with my router. My setup is
Internet -> router -> switch -> cisco 2621 -> pc
and i was first wondering is this really possible, i have a good feeling it is but its weird i could not find anying on it on the internet, atleast that would be helpful. I was recently on a chat room and they told me that i have to setup a static route with the first router to the 2621 and setup a defualt route back to the first router. Now i tried doing that with my E1200 cisco linksys router but it keeps saying invalid static router. If that is the basic idea than could someone please tell my how to do this or if its not could you again tell me how to do it mor give me some commands or pointers. My main problem is I have two ethernet ports, fa0/0 and fa0/1 and im not sure how to get my router to communicate these two ports so my pc can get the internet, any questions please ask and if you want to see my show run you can but im prob gonna change it anyway
thanks for the help
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12-29-2013 12:55 PM
Hi,
Internet -> router -> switch -> cisco 2621 -> pc
Your linksys router is a dhcp server with a scope in same subnet as the LAN interface( I suppose it is 192.168.1.0/24) so on the Cisco router interface connecting to the switch configure this:
int f0/0
ip address dhcp
on the other interface connected to your PC:
int f0/1
ip address 192.168.2.254 255.255.255.0
no shut
Now to NAT on the Cisco router:
int f0/1
ip nat inside
int f0/0
ip nat outside
access-list 1 permit 192.168.2.0 0.0.0.255
ip nat inside source list 1 interface f0/0
ip route 0.0.0.0 0.0.0.0 dhcp
to configure dhcp for the PC on the Cisco router:
ip dhcp excluded-address 192.168.2.254
no ip dhcp conflict
ip dhcp pool mypool
network 192.168.2.0 255.255.255.0
default-router 192.168.2.254
dns-server x.x.x.x y.y.y.y where x.x.x.x and y.y.y.y are ISP dns servers or if linksys is configured as cache server then put the LAN IP of the linksys router
Regards
Alain
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12-27-2013 09:56 PM
Hi,
Here is simple config as example.
PCs config:
192.168.0.2/24
gateway: 192.168.0.1
2621 config:
conf t
int f0/0
desc Connected to PC
ip add 192.168.0.1 255.255.255.0
no shut
int f0/1
desc Connected to switch
ip add 192.168.1.2 255.255.255.248
no shut
ip route 0.0.0.0 0.0.0.0 192.168.1.1
end
Router config (connected to Internet):
conf t
int f0/0
desc LAN
ip add 192.168.1.1 255.255.255.248
no shut
ip nat inside
int f0/1
desc Internet
ip add 1.1.1.2 255.255.255.252
no shut
ip nat outside
access-list 10 permit 192.168.0.0 0.0.0.255
ip nat inside source list 10 interface f0/1 overload
ip route 0.0.0.0 0.0.0.0 1.1.1.1
ip route 192.168.0.0 0.0.0.255 192.168.1.2
end
On switch you just need to make sure that ports of both routers on the same VLAN. For example:
conf t
vlan 10
int g1/0/2
desc Connected to 2621
switchport mode access
switchport access vlan 10
spanning-tree portfast
int g1/0/1
desc Connected Internet router
switchport mode access
switchport access vlan 10
spanning-tree portfast
int vlan 10
desc Mgmt
ip add 192.168.1.3 255.255.255.248
no shut
end
Hope it will help.
Best regards,
Abzal
12-28-2013 10:13 AM
ok thats good thanks for the help i must have forgot to menthion however the router conneected to the internet and the switch are regular equipment and are not programmable, the router is a E1200 linksys and the switch is a FVS318 netgear and im have problems setting up the static route with the E1200 and im not sure how to do the switch too
thanks
12-28-2013 11:51 AM
also i dont think my witch sees my 2621 is there a reason why that is?
12-29-2013 08:07 AM
First check your e1200 router.
Wich subnet is used there?
Possibly you need to configure your interface facing the e1200 as dhcp client?
And reconfigure the other interface to use a different subnet than the e1200.
Sent from Cisco Technical Support iPad App
12-29-2013 12:41 PM
thanks for the advice, i tried setting up nat on the 2621, no luck, the subnet on the 2621 is 255.255.255.0
how would i go about configuring the interface as dhcp and would that get the e1200 or switch to see my 2621 also why would i configure the other interface to use a different subnet?
thanks
12-29-2013 12:55 PM
Hi,
Internet -> router -> switch -> cisco 2621 -> pc
Your linksys router is a dhcp server with a scope in same subnet as the LAN interface( I suppose it is 192.168.1.0/24) so on the Cisco router interface connecting to the switch configure this:
int f0/0
ip address dhcp
on the other interface connected to your PC:
int f0/1
ip address 192.168.2.254 255.255.255.0
no shut
Now to NAT on the Cisco router:
int f0/1
ip nat inside
int f0/0
ip nat outside
access-list 1 permit 192.168.2.0 0.0.0.255
ip nat inside source list 1 interface f0/0
ip route 0.0.0.0 0.0.0.0 dhcp
to configure dhcp for the PC on the Cisco router:
ip dhcp excluded-address 192.168.2.254
no ip dhcp conflict
ip dhcp pool mypool
network 192.168.2.0 255.255.255.0
default-router 192.168.2.254
dns-server x.x.x.x y.y.y.y where x.x.x.x and y.y.y.y are ISP dns servers or if linksys is configured as cache server then put the LAN IP of the linksys router
Regards
Alain
Don't forget to rate helpful posts.
12-29-2013 01:28 PM
that helped alot Alain thank you now my switch sees the 2621 but my pc is coming up with a error because its not "getting internet" in some way
"your computer appears to be coprretly configured, but the device or source(www.mircrosoft.com) is not responsing"
but when i load my browser website do come up not all of them though is there anything i could do?
again thank you alot
12-29-2013 02:25 PM
Hi,
post running config of the router and the output of ipconfig/all on the PC.
Can you ping 8.8.8.8 and www.google.com from the PC ?
Can you add these 2 commands on the cisco router:
int f0/0
ip mtu 1492
ip tcp-mss-adjust 1452
And tell us if your web browsing experience is bettered
Regards
Alain
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12-29-2013 03:02 PM
hello
running config
ipconfig/all (couldnent copy and paste so tell me if you need more info)
ethernet
ipv4 address 192.168.2.1
subnet 255.255.255.0
default gateway 192.168.2.254
dhcp server 192.168.2.254
i tried to ping them both and got 'request timed out'
i put the one command in since the other one was not compatible with my router and there was no difference
thank you
12-30-2013 01:35 AM
Hi,
Yes i did a typo for second command, it should be ip tcp adjust-mss 1452.
So you can't ping 8.8.8.8 from PC ? Can you do it from the cisco router ?
ok , I looked at your config, you should do this
no ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
no ip route 0.0.0.0 0.0.0.0 FastEthernet0/1
ip route 0.0.0.0 0.0.0.0 dhcp
You'll be able to ping 8.8.8.8 from your router and from your PC
try to ping www.google.com from PC and tell me if it works now and add second command too if you still got some problems with browsing some sites.
Regards
Alain
Don't forget to rate helpful posts.
12-30-2013 10:14 AM
again thanks for the help
the reason i did those ip routes, since i forgot to mention it before, is because 'ip route 0.0.0.0 0.0.0.0 dhcp' was not recognized, these are the only options for 'ip route 0.0.0.0 0.0.0.0 ?'
A.B.C.D Forwarding router's address
Async Async interface
BVI Bridge-Group Virtual Interface
CTunnel CTunnel interface
Dialer Dialer interface
FastEthernet FastEthernet IEEE 802.3
Lex Lex interface
Loopback Loopback interface
Multilink Multilink-group interface
Null Null interface
Tunnel Tunnel interface
Vif PGM Multicast Host interface
Virtual-Template Virtual Template interface
Virtual-TokenRing Virtual TokenRing
also
ip tcp adjust-mss1452 was not recognized either but it has compression-connections and header-compressions i dont know if that helps
and no i cant ping 8.8.8.8 from my 2621
thanks
12-30-2013 11:04 AM
Hi,
ok then still delete those 2 static default routes and you should have a default route from DHCP which willlet you ping 8.8.8.8 from the cisco router.
if you stil can't then post following:
-show ip int br | exc unassigned
-sh ip route static
Regards
Alain
Don't forget to rate helpful posts.
12-30-2013 11:18 AM
yes that worked i am now getting internet thanks alot for the help that really helped
richard
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