Dialout via RS-232 cable attached to analog modem?

I have a V.90 modem and use it to dial my ISP attached to AUX of a 2500.

I just scored an RS-232 cable.

The AUX method uses an Async virtual interface to encapsulate the traffic.
Does anyone know of a way to dialout via the serial using the 232 cable? Do
I still use the Async, or a Dialer interface, or am I way off?

Thanks in advance...

Sutto

 

~ I have a V.90 modem and use it to dial my ISP attached to AUX of a 2500.
~
~ I just scored an RS-232 cable.
~
~ The AUX method uses an Async virtual interface to encapsulate the traffic.
~ Does anyone know of a way to dialout via the serial using the 232 cable? Do
~ I still use the Async, or a Dialer interface, or am I way off?
~
~ Thanks in advance...
~
~ Sutto

Use the aux. Set the aux to 38400bps. If your ISP gives
you a single IP address from a pool, then you'll need to
use "ip address negotiated" and NAT overload, which means
you'll need relatively recent IOS (11.3 that is - recent
by 2500 standards.)

Here's an example. This assumes that you LAN
is 10.0.0.0/8. If you don't have a DHCP server
on your LAN, you may want to configure an IOS
DHCP server. debugs:

debug dialer
debug chat line 1
debug modem
debug ppp negotiation

Aaron

---

ip nat inside source list 100 interface Async1 overload
chat-script callout "" AT OK "ATDT\T" TIMEOUT 60 CONNECT \c\p
!
interface Ethernet0
ip address 10.0.0.1 255.0.0.0
ip nat inside
!
interface async 1
ip address negotiated
ip nat outside
encapsulation ppp
dialer in-band
dialer idle-timeout 900
dialer string 14085703933
dialer hold-queue 20
dialer-group 1
async dynamic address
async mode interactive
no peer default ip address
no cdp enable
ppp authentication pap callin
ppp pap sent-username cisco password 0 whatever
!
ip classless
ip route 0.0.0.0 0.0.0.0 Async1 permanent
ip route 0.0.0.0 0.0.0.0 Null0 200
!
access-list 100 permit ip any any
dialer-list 1 protocol ip permit
!
line 1
modem inout
speed 115200 ! 38400 if an aux port
script dialer callout
flowcontrol hardware
stopbits 1

 

Thanks Aaron, it works!

Do you know if there is a way working around the AUX limitation of 38400?
(ie: use a serial?)

Cheers,
Sutto

 

The 2500 aux port is limited to 38400 bps;
there is no workaround. (Newer routers -
1700s, 2600s, 36/3700s etc. - have 115200 bps
aux ports.)

The 2500 serial interfaces only support synchronous
operation, not async, so there's no way to use them
with an async modem.

So - in your case, what you've got now is
the best you're going to be able to do.

Aaron

---


~ Thanks Aaron, it works!
~
~ Do you know if there is a way working around the AUX limitation of 38400?
~ (ie: use a serial?)
~
~ Cheers,
~ Sutto
~
~ ~ >
~ > ~ I have a V.90 modem and use it to dial my ISP attached to AUX of a 2500.
~ > ~
~ > ~ I just scored an RS-232 cable.
~ > ~
~ > ~ The AUX method uses an Async virtual interface to encapsulate the
~ traffic.
~ > ~ Does anyone know of a way to dialout via the serial using the 232 cable?
~ Do
~ > ~ I still use the Async, or a Dialer interface, or am I way off?
~ > ~
~ > ~ Thanks in advance...
~ > ~
~ > ~ Sutto
~ >
~ > Use the aux. Set the aux to 38400bps. If your ISP gives
~ > you a single IP address from a pool, then you'll need to
~ > use "ip address negotiated" and NAT overload, which means
~ > you'll need relatively recent IOS (11.3 that is - recent
~ > by 2500 standards.)
~ >
~ > Here's an example. This assumes that you LAN
~ > is 10.0.0.0/8. If you don't have a DHCP server
~ > on your LAN, you may want to configure an IOS
~ > DHCP server. debugs:
~ >
~ > debug dialer
~ > debug chat line 1
~ > debug modem
~ > debug ppp negotiation
~ >
~ > Aaron
~ >
~ > ---
~ >
~ > ip nat inside source list 100 interface Async1 overload
~ > chat-script callout "" AT OK "ATDT\T" TIMEOUT 60 CONNECT \c\p
~ > !
~ > interface Ethernet0
~ > ip address 10.0.0.1 255.0.0.0
~ > ip nat inside
~ > !
~ > interface async 1
~ > ip address negotiated
~ > ip nat outside
~ > encapsulation ppp
~ > dialer in-band
~ > dialer idle-timeout 900
~ > dialer string 14085703933
~ > dialer hold-queue 20
~ > dialer-group 1
~ > async dynamic address
~ > async mode interactive
~ > no peer default ip address
~ > no cdp enable
~ > ppp authentication pap callin
~ > ppp pap sent-username cisco password 0 whatever
~ > !
~ > ip classless
~ > ip route 0.0.0.0 0.0.0.0 Async1 permanent
~ > ip route 0.0.0.0 0.0.0.0 Null0 200
~ > !
~ > access-list 100 permit ip any any
~ > dialer-list 1 protocol ip permit
~ > !
~ > line 1
~ > modem inout
~ > speed 115200 ! 38400 if an aux port
~ > script dialer callout
~ > flowcontrol hardware
~ > stopbits 1
~