T1 line keep droping Cisco 1720

[digitalrice]

hello everyone, I was able to configure cisco 1720 to get online via a full T1, however, the internet keep dropping every 5 minutes. I have to turn off the cisco router in order to get online. any idea?

T1(WAN)
69.19.251.20 255.255.255.252 Subnet Address
69.19.251.21 LA Bridge
69.19.251.22 LA Bridge CPE Router (WAN)
69.19.251.23 255.255.255.252 Broadcast Address

Ethernet (LAN)
69.19.251.96 255.255.255.240 Subnet Address
69.19.251.97 LA Bridge CPE Router (LAN)
69.19.251.98 – 69.15.251.110 LA Bridge Customer LAN
69.19.251.111 255.255.255.240 Broadcast Address

I was able to ping from IOS, and from any computer to this ip address: 69.19.251.97, and 69.19.251.21, but wasn't able to ping from cisco IOS Hyperterminal to any website. Can you guy check to see if my configuration is correct?
thanks


LAXBAR1#show run
Building configuration...
Current configuration : 857 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname LAXBAR1
!
enable secret 5 $1$pxyG$h3V9OTGKDXYBKqoKVPM5d0
enable password ******
!
memory-size iomem 20
ip subnet-zero
ip name-server 206.117.169.9
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0
ip address 69.19.251.97 255.255.255.240
ip broadcast-address 69.19.251.111
speed auto
full-duplex
!
interface Serial0
ip address 69.19.251.21 255.255.255.252
!
interface Dialer0
ip address negotiated
ip access-group 110 in
ip access-group 110 out
no cdp enable
!
ip default-gateway 69.19.251.21
ip classless
ip route 0.0.0.0 0.0.0.0 69.19.251.21
ip route 69.19.251.96 255.255.255.240 69.19.251.22
no ip http server
!
!
line con 0
line aux 0
line vty 0 4
password ******
login
!
end
LAXBAR1#



LAXBAR1#sho ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 69.19.251.21 to network 0.0.0.0

1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
69.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 69.19.251.20/30 is directly connected, Serial0
C 69.19.251.96/28 is directly connected, FastEthernet0
S* 0.0.0.0/0 [1/0] via 69.19.251.21
LAXBAR1#





LAXBAR1#sh in s0

Serial0 is up, line protocol is up

Hardware is PQUICC with Fractional T1 CSU/DSU
Internet address is 69.19.251.21/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:07, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1433 packets input, 103308 bytes, 0 no buffer
Received 634 broadcasts, 0 runts, 0 giants, 0 throttles
Received 634 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
734 packets output, 45792 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up



LAXBAR1#show int f0
FastEthernet0 is up, line protocol is up
Hardware is PQUICC_FEC, address is 00b0.c289.301c (bia 00b0.c289.301c)
Internet address is 69.19.251.97/28
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:32:39, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo

Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
670 packets output, 50660 bytes
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

 

[webnetwiz]

Your default gateway is the IP address of your Serial0 interface, which is not correct. Your gateway should be the .22 address, which is the IP on the other side of that T1. The router needs to send traffic to your ISP.

Remove all routes, and add the following:

ip route 0.0.0.0 0.0.0.0 Serial0

 

[digitalrice]

Thanks for the help. I figured it out after an hours of struggle.