Can serial interface be configured as ethernet??? 1

[dkla]

I have a cisco 1700 router with a T1 DSU/CSU serial interface that uses an RJ-45 connector. Is there any way to configure this interface to be an ethernet/fast ethernet interface? To clarify - since there is only one ethernet interface on the router I can't really use it as a router w/full duplex. Any suggestions?

 

[LarryTheCucumber]

No, you can't use the T1 as an ethernet port. There is a module from Cisco that will give you a second ethernet.
Cisco P/N WIC-1ENET 10Mb

Is this a 1720?

The ethernet port should be a 10/100 ethernet full duplex.

THe last part of your question is a little vague.

 

[dkla]

What I meant was that I can still use the router even w/one ethernet port - just configure two IPs on the same interface and set it up as half duplex, right?

 

[webnetwiz]

I don't think that would work, the 1720 would need the ethernet module. I don't think you can give an ethernet interface more than 1 ip. and I don't think it has sub-interfaces.

 

[BuckWeet]

You could give the ethernet port multiple IP's

You would use the "ip address x.x.x.x x.x.x.x secondary" command


BuckWeet

 

[webnetwiz]

Would the interface then respond to both IP addresses?

 

[dkla]

Yes the interface would respond to both IPs. The more important question is would it route correctly? Has anyone tried it?

 

[BuckWeet]

Worked perfect for me everytime I've used it..

BuckWeet

 

[Netguys]

If need ethernet port for CIsco 2524 then what is the solution or part number?

 

[abovebrd]

Yes the interface would respond to both IP's because its configured to do so.

How would this effect an access-list applied to the interface ?

Interface E0/0
IP address 192.168.1.1
IP adress 192.168.1.10

access-list 101 deny IP host 192.168.1.1 any

Would it allow packets for 192.168.1.10 through ?
My guess is yes, just wondering would have an some ill effect.

Sub interfaces may be a better approach if both IPs are on different subnets.

just my 2 cents

-Danny
dan@snoboarder.net

 

[dkla]

For some reason I can't seem to be able to get my router working on that single Fast Ethernet interface. May be BuckWeet can help me out since he has done it before. Here's my config so far (not working). I've replaced the public IP with * for privacy reasons -

memory-size iomem 25
ip subnet-zero
no ip source-route
no ip finger
ip name-server 206.13.29.12
ip name-server 206.13.30.12
ip dhcp excluded-address 192.168.1.1 192.168.1.10
!
ip dhcp pool 2
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 206.13.29.12 206.13.30.12
lease 90
!
!
!
!
!
interface FastEthernet0
description Local Lan segment
ip address 192.168.1.1 255.255.255.0 secondary
ip address *.*.*.174 255.255.255.252
no ip directed-broadcast
ip nat inside
no ip route-cache
half-duplex
no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 *.*.*.173
ip route *.*.*.173 255.255.255.255 FastEthernet0
no ip http server
!
access-list 50 permit 192.168.1.0 0.0.0.255
no cdp run
banner motd ^C
*********************************************************************
!
line con 0
exec-timeout 0 0
logging synchronous
transport input none
line aux 0
line vty 0 4
session-timeout 10
access-class 50 in
exec-timeout 11 0
password 7 060506324F41
login
!
no scheduler allocate
end