I have configured a 2621 to access a network via a NT4 RAS server, using a modem on the aux port. This seems to work quite well. BUT, when I try to use this over a satellite link there seems to be a problem when the end to end delay exceeds a second or so. What I see is the packet leave the router but never return. Also occasionally there is a large amount of APPP65 traffic in and out of the router, for no apparent reason (something resyncing perhaps?). I also experience a problem where a ping request is replied to at the async port but never seems to meet the higher protocols, i.e. the request hits the router but not IP/ICMP as if it is stuck in a buffer or being dropped. I do not experience these problems if I am using the modem attached directly to the router. (The satellite provides the RS232 comms between router and modem)
Does anyone know of a timeout value that can be increased to allow better stability? or have any other ideas.
The router config
(BTW The modem printer command is because the modem has a weird interface where DCD (DSR) cannot be controlled and is always set high)
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Ocean
!
enable password ******
!
!
!
!
!
memory-size iomem 30
ip subnet-zero
no ip domain-lookup
!
chat-script SHORE ABORT ERROR ABORT BUSY "" "AT" "OK" "ATDT\T" TIMEOUT 60 CONNECT \c
modemcap entry paul:MSC=&c0*fl0*mf0&d6
!
!
!
interface Loopback0
ip address 132.0.214.4 255.255.255.255
no ip directed-broadcast
!
interface FastEthernet0/0
ip address 25.59.204.1 255.255.255.0
no ip directed-broadcast
no ip mroute-cache
speed auto
half-duplex
no cdp enable
!
interface Serial0/0
ip unnumbered FastEthernet0/0
no ip directed-broadcast
encapsulation ppp
ip ospf authentication-key NAVYNET
ip ospf cost 20
ip ospf hello-interval 15
ip ospf dead-interval 45
no ip mroute-cache
!
interface FastEthernet0/1
no ip address
no ip directed-broadcast
shutdown
duplex auto
speed auto
!
interface Async65
no ip address
no ip directed-broadcast
encapsulation ppp
dialer in-band
dialer pool-member 20
async default routing
ppp authentication pap chap ms-chap callin
ppp chap refuse
ppp pap sent-username NTDOMAIN\userid password **************
!
interface Dialer10
ip unnumbered Loopback0
no ip directed-broadcast
dialer pool 20
dialer string 123456789
dialer-group 1
no cdp enable
!
router ospf 1
area 0.0.0.0 authentication
network 25.0.0.0 0.255.255.255 area 0.0.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer10 150
no ip http server
ip ospf name-lookup
!
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
!
line con 0
password letmein
login
transport input none
line aux 0
exec-timeout 0 0
script dialer SHORE
modem Printer
transport output none
stopbits 1
speed 19200
flowcontrol hardware
line vty 0 4
password letmein
login
!
end
