Any Cisco IOS experts here?

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Any Cisco IOS experts here?

Postby bluedalmatian » 2019-12-06 16:08

Im trying to set up a demo Remote Access Server using a Cisco router with a modem card in it. It uses the subnet for dialup PPP connections coming in on Line0/0/0 and the subnet for PPPoE connections coming in on

The PPPoE connections are working fine but dialup PPP with the modem isnt.
The dial in client obtains an IP address from the pool fine and knows the IP of the RAS correctly but neither can ping each other.

Below is the running config together with the output from show ip route and show line 0/0/0 and show int async 0/0/0

Can anyone please help me understand whats wrong here, it seems to be the same as the examples Ive looked at .Ive tried changing ip unnumbered loopback0 to ip unnumbered G0/0 (the uplink interface) but it made no difference.



Code: Select all
username sub101-1 password 0 pass
username sub103-1 password 0 pass
bba-group pppoe ISP_101_GROUP
 virtual-template 1
interface Loopback0
 ip address
interface GigabitEthernet0/0
 ip address
 duplex auto
 speed auto
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 pppoe enable group ISP_101_GROUP

interface GigabitEthernet0/2
 no ip address
 duplex auto
 speed auto
interface Virtual-Template1
 ip address
 peer default ip address pool ISP_101_POOL
 ppp authentication chap callin
interface Group-Async3
 ip unnumbered Loopback0
 encapsulation ppp
 peer default ip address pool ISP_103_POOL
 async mode dedicated
 no keepalive
 ppp authentication chap dialin
 group-range 0/0/0 0/0/1
ip local pool ISP_101_POOL
ip local pool ISP_103_POOL
ip forward-protocol nd
no ip http server
no ip http secure-server
ip route
line con 0
line aux 0
line 0/0/0 0/0/1
 login local
 modem Dialin
 autoselect ppp
 stopbits 1
 speed 115200
 flowcontrol hardware
line vty 0 4
scheduler allocate 20000 1000

Code: Select all
show int async 0/0/0
Async0/0/0 is up, line protocol is up
  Hardware is WIC Integrated Modem
  Interface is unnumbered. Using address of Loopback0 (
  MTU 1500 bytes, BW 115 Kbit/sec, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Open
  Open: IPCP, loopback not set

show line 0/0/0
   Tty Line Typ     Tx/Rx    A Modem  Roty AccO AccI  Uses  Noise Overruns  Int
A 0/0/0    3 TTY 115200/115200- DialIn    -    -    -    14      0    0/0      -

Line 0/0/0, Location: "PPP:", Type: ""
Length: 24 lines, Width: 80 columns
Baud rate (TX/RX) is 115200/115200, no parity, 1 stopbits, 8 databits
Status: Ready, Active, No Exit Banner, Async Interface Active
  HW PPP Support Active, CTS Raised, 0x400000
Capabilities: Hardware Flowcontrol In, Hardware Flowcontrol Out
  Modem RI is CD, Line is permanent async interface,
  Get Modem Info Enabled, WIC Modem
Modem state: Ready
Line is running PPP for address
9 output packets queued, 1 input packets.
 Async Escape map is 00000000000000000000000000000000
Modem hardware state: CTS DSR  DTR RTSModem Registers (0x10000000)- IMR:0x0 LED:0x2 RstCntrl:0x0 MSR:0x6F

Special Chars: Escape  Hold  Stop  Start  Disconnect  Activation
                ^^x    none   -     -       none
Timeouts:      Idle EXEC    Idle Session   Modem Answer  Session   Dispatch
               00:10:00        never                        none     not set
                            Idle Session Disconnect Warning

#show ip route
Codes: L - local, C - connected, S - static, 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
       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, + - replicated route

Gateway of last resort is to network

S* [1/0] via is variably subnetted, 6 subnets, 2 masks
C is directly connected, Virtual-Access1.1
C is directly connected, Virtual-Access1.1
L is directly connected, Virtual-Access1.1
C is directly connected, Loopback0
C is directly connected, Async0/0/0
L is directly connected, Loopback0 is variably subnetted, 2 subnets, 2 masks
C is directly connected, GigabitEthernet0/0
L is directly connected, GigabitEthernet0/0

To clarify I cant ping from the RAS and I cant ping from the client.

Below is the log from the client (a Mac using the built in Mac OS X PPP/dial up software and modem)

Code: Select all
Modem Reliable Link Established.
Modem Compression Established.
Communicating at 33600 bps.
Connect: ppp0 <--> /dev/cu.modem
local  IP address
remote IP address

Serial link appears to be disconnected.
Modem hangup
Connection terminated.
Last edited by bluedalmatian on 2019-12-06 16:23, edited 1 time in total.
Posts: 25
Joined: 2010-10-26 09:58

Re: Any Cisco IOS experts here?

Postby arzgi » 2019-12-06 16:18

This is Debian user forum.
Posts: 510
Joined: 2008-02-21 17:03
Location: Finland

Re: Any Cisco IOS experts here?

Postby bluedalmatian » 2019-12-06 16:24

Yes and its in the off-topic sub forum?
Posts: 25
Joined: 2010-10-26 09:58

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