Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations Mike Lewis on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Routing issue with direct connected Networks

Status
Not open for further replies.

skk391

Technical User
Mar 3, 2009
332
GB
Hi all,

I've having a few problems with our network and would like to some guidance and help please...

Internet --- ISA FIrewall------Local Network ----- Cisco Router -----Local subnets (10.1.1.x & 172.16.0.x)

We usually use our 10.1.1.x for our internet clients but no have a need for our 172.16.0.x to access the internet as well. I have installed the ISA clients on our clients but cannot get them to connect to the ISA. I think that there is a underlining routing issue on the network.

I added another NIC to our ISA firewall on the 172.16.0. range so I at least I had a direct connect in that network and then carried out the following tests....

172.16.0.10 (ISA) --> Ping 172.16.0.1 ( Local internet on cisco router ) --- ping'ed ok
172.16.0.10 (ISA) --> ping 10.1.1.28 (Local internet on cisco router on the 10.1.1.X range ---- ping'ed ok
172.16.0.10 (ISA) ---> ping 172.16.0.65 ( Client requiring Internet connection) the first ping times out and the 3 pings after that destination unreachable

I have copied my config but I don't understand it.... The two subnets are directly connected so there should be any need to for any routeing statements should there? There is a problem routing from one subnet to the other even though the two subnets are connected directly to the cisco router.......

router>en
Password:
router#show config
Using 1726 out of 29688 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname router
!
boot-start-marker
boot-end-marker
!
!
no network-clock-participate slot 1
no network-clock-participate wic 0
no aaa new-model
ip subnet-zero
ip cef
!
!
ip domain lookup source-interface FastEthernet0/1
ip domain name horizon
ip host **** 10.1.1.2
ip host **** 10.1.1.12
ip host **** 10.1.1.11

ip name-server 10.1.1.12
ip name-server 10.1.1.18
ip dhcp excluded-address 172.16.0.1 172.16.0.30
!
ip dhcp pool VOIP
network 172.16.0.0 255.255.255.0
default-router 172.16.0.1
dns-server 10.1.1.12
option 242 ascii "172.16.0.2,MCPORT=1719,HTTPSRVR=172.16.0.2,VLANTEST=1"
option 176 ascii "MCIPADD=172.16.0.2,MCPORT=1719,TFTPSRVR=172.16.0.2,HTTPSRVR=172.16.0.2,VLANTEST=1"
domain-name horizon.net
lease 14
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0

ip address 172.16.0.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1

ip address 10.1.1.28 255.255.255.0
duplex auto
speed auto
!
ip http server
ip classless
ip route 172.16.0.0 255.255.255.0 172.16.0.10
ip route 172.16.0.159 255.255.255.255 172.16.0.10
!
!
!
snmp-server community public RW
snmp-server enable traps tty
!
!
!
!
!
!
line con 0
password
line aux 0
line vty 0 4
password
no login
!
!
!
end




router#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
S 172.16.0.159/32 [1/0] via 172.16.0.10
C 172.16.0.0/24 is directly connected, FastEthernet0/0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/1
router#


 
I guess I'm confused about your config -- your router appears to have 2 interfaces assigned to the LAN side, but none to the WAN side. Aren't you using it as a router?

The way you describe your network, you need 2 subinterfaces on the router's LAN side (10.1.1.0/24 and 172.16.0/24) and then a different subnet on the WAN side (probably Fa0/1). Otherwise your router isn't doing any routing.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top