router with different IP class adresses

[ridney]

---

dili pwede bro

[sunyats3n]

advisable mag static route ka bai

[juantamad]

what brand of router are you using?

[dontknowmewho]

ani ang config niya mga bro. mail server <----> router(10.190.1.254 CISCO) <---->switch <----->router(192.168.0.1 3COM) <------> pc(192.168.0.2)

mao ni ako mga router mga bro

[sleepydeepeyed]

configure your NAT sa 3COM... kung pwede lang "Port Forwarding sa CISCO."

[ridney]

now you can! as suggested by juantamad, you need to use a secondary ip address on the cisco router or on the 3com switch.

here's a sample config i made to test this scenario to let you know it's possible.

mail server (10.190.1.1) <----> cisco router(10.190.1.254/192.168.0.254 secondary) <----> switch
switch <----> 3com router(192.168.0.1) <----> pc(192.168.0.2)


************
cisco router
************

the cisco router has been configured with a secondary ip address that is within the same subnet as the 3com router (192.168.0.254) while leaving the primary ip address (10.190.1.254) untouched.

Rack1R4#sh run int e0
Building configuration...

Current configuration : 116 bytes
!
interface Ethernet0
ip address 192.168.0.254 255.255.255.0 secondary
ip address 10.190.1.254 255.255.255.0
end


this is the routing table of the cisco router

Rack1R4#sh ip route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets
C 10.190.1.0 is directly connected, Ethernet0
C 192.168.0.0/24 is directly connected, Ethernet0



test connectivity with the 3com router

Rack1R4#ping 192.168.0.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/45/120 ms



test connectivity with the pc behind the 3com router

Rack1R4#ping 192.168.0.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms



test connectivity with the mail server

Rack1R4#ping 10.190.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.190.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/42/104 ms




********************************
Assuming this is the 3com router
********************************

NOTE: i only have a cisco router to test, but the logic would still be the same for the 3com.

on the 3com router, you need to specify a static route to the 10.190.1.0/24 network pointing to the secondary ip address of the cisco router (192.168.0.254)

this is what it looks like on a cisco router

ip route 10.190.1.0 255.255.255.0 192.168.0.254


this is the ip address configured on the ethernet interface

Rack1R5#sh run int e0
Building configuration...

Current configuration : 80 bytes
!
interface Ethernet0
ip address 192.168.0.1 255.255.255.0
end



this is the routing table of the assumed 3com router
take note of where the 10.190.1.0/24 network is pointing

Rack1R5#sh ip route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets
S 10.190.1.0 [1/0] via 192.168.0.254
C 192.168.0.0/24 is directly connected, Ethernet0
Rack1R5#



test connectivity with the cisco's secondary ip address

Rack1R5#ping 192.168.0.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.254, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/31/128 ms



test connectivity with the cisco's primary ethernet interface

Rack1R5#ping 10.190.1.254

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.190.1.254, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/12 ms



test connectivity with the mail server

Rack1R5#ping 10.190.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.190.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/68/152 ms



***********
mail server
***********

C:\>ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 10.190.1.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.190.1.254

C:\>ping 192.168.0.2 (PC)

Pinging 192.168.0.2 with 32 bytes of data:

Reply from 192.168.0.2: bytes=32 time=7ms TTL=254
Reply from 192.168.0.2: bytes=32 time=7ms TTL=254
Reply from 192.168.0.2: bytes=32 time=7ms TTL=254
Reply from 192.168.0.2: bytes=32 time=7ms TTL=254

Ping statistics for 192.168.0.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 7ms, Maximum = 7ms, Average = 7ms

C:\>tracert 192.168.0.2

Tracing route to 192.168.0.2 over a maximum of 30 hops

1 2 ms 2 ms 2 ms 10.190.1.254
2 7 ms 7 ms 7 ms 192.168.0.2

Trace complete.



*******************
PC IP configuration
*******************

C:\>ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1


test connectivity with mail server

C:\>ping 10.190.1.1

Pinging 10.190.1.1 with 32 bytes of data:

Reply from 10.190.1.1: bytes=32 time=108ms TTL=254
Reply from 10.190.1.1: bytes=32 time=94ms TTL=254
Reply from 10.190.1.1: bytes=32 time=37ms TTL=254
Reply from 10.190.1.1: bytes=32 time=97ms TTL=254

Ping statistics for 10.190.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 37ms, Maximum = 108ms, Average = 84ms

C:\>tracert 10.190.1.1

Tracing route to 10.190.1.1
over a maximum of 30 hops:

1 3 ms 3 ms 3 ms 192.168.0.1
2 12 ms 6 ms 5 ms 10.190.1.254
3 99 ms 12 ms 183 ms 10.190.1.1

Trace complete.



or you have the option to use the cisco router (192.168.0.254) as the default gateway instead which saves you time and bandwidth

C:\>ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.254

C:\>ping 10.190.1.1

Pinging 10.190.1.1 with 32 bytes of data:

Reply from 10.190.1.1: bytes=32 time=83ms TTL=254
Reply from 10.190.1.1: bytes=32 time=30ms TTL=254
Reply from 10.190.1.1: bytes=32 time=54ms TTL=254
Reply from 10.190.1.1: bytes=32 time=125ms TTL=254

Ping statistics for 10.190.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 30ms, Maximum = 125ms, Average = 73ms

C:\>tracert 10.190.1.1

Tracing route to 10.190.1.1
over a maximum of 30 hops:

1 2 ms 2 ms 2 ms 10.190.1.254
2 49 ms 9 ms 8 ms 10.190.1.1

Trace complete.



i hope this made things clear

regards,

ridney

[ridney]

i forgot to mention that the cisco and 3com routers should share the same vlan if you're implementing it on the switch.

[dontknowmewho]

mga bro, thanks kaayo it helps jud inyo mga posts especially ridney og juantamad and all of you guys thank you.