Point to Point T1 using Cisco 2620 and Adtran 3200

I am having a problem getting my two routers configured correctly so that we can utilitze our point to point T1.  I am by far not an expert with routers so please bear with me.  I currently have the routers configured in this manner.
Main Office
Adtran 3200
external (T1) IP address 172.20.1.1 255.255.255.0
internal IP address 172.18.1.19

Remote Location
Cisco 2620
external (T1) IP address 172.20.1.2 255.255.255.0
internal IP address 172.18.5.1

The remote location has PLC that will need to talk with a server at the Main office.  We have no internet that will need to be configured.  I basically want all traffic from the remote site to go down the Point to Point, and traffic destin for the 172.18.5.x network to travel from the Main Office down the Point to Point.

A little bit more insight into how I got into the Cisco Adtran environment.  To make is short we orderd 2 Adtrans one showed up.  We need this link up this weekend, and had the Cisco laying around.  I lost the .bin file on it and reloaded one that I had found...hopefully this is correct.

Below is the results of show run on both routers.
 
Main office Adtran Router
sh run
Building configuration...
!
!
! ADTRAN, Inc. OS version 17.05.02.00
! Boot ROM version 17.02.01.00
! Platform: NetVanta 3205 AC, part number 1203870G1
! Serial number LBADTN0903AF655
!
!
hostname "Router"
enable password password
!
clock timezone -6-Central-Time
!
ip subnet-zero
ip classless
ip routing
!
 
!
 
!
!
no auto-config
!
--MORE--        event-history on
no logging forwarding
no logging email
!
no service password-encryption
!
username "admin" password "password"
!
banner motd #
                ****** Important Banner Message ******
 
Enable and Telnet passwords are configured to "password".
HTTP and HTTPS default username is "admin" and password is "password".
Please change them immediately.
 
The ethernet 0/1 interface is enabled with an address of 10.10.10.1
Telnet, HTTP, and HTTPS access are also enabled.
To remove this message, while in configuration mode type "no banner motd".
 
                  ****** Important Banner Message ******
 
 
#
--MORE--        !
ip policy-timeout tcp telnet 14400
!
no ip firewall alg msn
no ip firewall alg mszone
no ip firewall alg h323
!
!
!
!
!
!
!
no dot11ap access-point-control
!
!
!
!
!
!
!
!
!
--MORE--        !
interface eth 0/1
  ip address  172.18.1.19  255.255.0.0 
  no shutdown
!
!
!
!
interface t1 1/1
  tdm-group 1 timeslots 1-24 speed 64
  no shutdown
!
interface ppp 1
  ip address  172.20.1.1  255.255.255.0 
  peer default ip address 172.20.1.2
  no shutdown
  cross-connect 1 t1 1/1 1 ppp 1
!
!
!
!
!
!
--MORE--        !
!
ip route 0.0.0.0 0.0.0.0 ppp 1
ip route 172.18.5.0 255.255.255.0 172.20.1.2
!
no ip tftp server
no ip tftp server overwrite
ip http server
ip http secure-server
no ip snmp agent
no ip ftp server
no ip scp server
no ip sntp server
!
!
!
!
no snmp-server enable traps
!
!
!
!
 
!
 
--MORE--        !
 
!
line con 0
  no login
!
line telnet 0 4
  login
  password password
  no shutdown
line ssh 0 4
  login local-userlist
  no shutdown
!
!
!
!
!
end
 
 
 
Remote Location Cisco 2620
sh run
Building configuration...
 
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Router
!
enable secret 5 $1$20Us$MITn8gd87Fd8svzIUnV3D1
enable password ciscoen
!
!
!
!
!
ip subnet-zero
!
!
!
!
interface FastEthernet0/0
 --More--          ip address 172.18.5.1 255.255.0.0
 no ip directed-broadcast
 speed auto
 half-duplex
!
interface Serial0/0
 description connected to KU-MOB
 ip address 172.20.1.2 255.255.255.0
 no ip directed-broadcast
 encapsulation ppp
 no ip mroute-cache
!
router igrp 1
 redistribute connected
 network 172.18.0.0
 network 172.20.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.20.1.1
no ip http server
!
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx permit
 --More--         !
line con 0
 transport input none
line aux 0
line vty 0 4
 password cisco
 login
!
end

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lahma35Asked:
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Jan SpringerCommented:
I would recommend configuring OSPF and announce the connected subnets and static routes at each end.  With only two points, there is no need for a default route.  This, both networks will know the location of each others address space.
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lahma35Author Commented:
Jesper
Thank you for the reply.  I did end up getting the point to point up this weekend.  It was IP subnetting issues.  We figured out we were using a /16 subnet for our network which through a big hurdle into making the routes work.  We ended up changing this site to a 192.x.x.x/24 IP scheme which resolved the routing issues.
I am unfamiliar with OSPF.  Could you give me a little more info on how this would be an easier solution for this situation?

Thanks
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Jan SpringerCommented:
OSPF is an interior routing protocol used to establish OSPF neighbors and announce known local prefixes to neighbors.  I don't clearly understand your original problem, so I can't say for sure that OSPF would have fixed it.
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