[c-nsp] OSPF over PPPoATM

[Tassos Chatzithomaoglou]

Daniele Orlandi wrote on 25/10/2008 20:06:
> On Monday 20 October 2008 15:43:03 Marko Milivojevic wrote:
>> Before I accuse intermediate DSLAM filtering them, could you post
>> relevant interface and OSPF process configurations from both routers,
>> please?
> 
> Marko,
> 
> Would it be possible for a DSLAM to implement filtering on the AAL5 
> encapsulated traffic? It would have to decapsulate and interpret UDP/IP 
> packets to do it. Did you experience anything similar?
> 

I have met dslams that block broadcast/multicast traffic going from the user side to the 
network side. But it was IPoA traffic. In your case the traffic is encapsulated into PPP, 
so it should be much harder for the dslam to check inside it.

> I would point my finger at a IOS bug, however I tried several completely 
> different IOSes on both the termination and DSL box with no change.
> 
> Anyway, this is the relevant configuration:
> 
> 7200 PPP terminator:
> ------------------------------
> 
> interface ATM2/0
>  no ip address
>  load-interval 30
>  atm sonet stm-1
>  atm pppatm passive
>  no atm auto-configuration
>  no atm ilmi-keepalive
>  no atm address-registration
>  no atm ilmi-enable
>  
>  range PPPOA-10 pvc 10/100 10/250
>   ubr 1000
>   dbs enable
>   oam-range manage
>   encapsulation aal5mux ppp Virtual-Template1
>   create on-demand
> 
> interface Virtual-Template1
>  ip unnumbered Loopback0
>  no ip redirects
>  no ip proxy-arp
>  ip ospf message-digest-key 1 md5 7 xxxx
>  ip ospf network point-to-point
>  peer default ip address pool adsl
>  ppp authentication pap callin adsl
>  ppp authorization adsl
>  ppp accounting adsl
> 
> router ospf 9026                                                        
>  log-adjacency-changes                                                  
>  area 0 authentication message-digest                                   
>  summary-address 62.212.6.0 255.255.255.0                               
>  summary-address 62.212.4.0 255.255.255.0                               
>  redistribute connected subnets                                         
>  redistribute static subnets                                            
>  network 62.212.0.0 0.0.31.255 area 0      
> 
> -----
> 

Below you don't have an ip address ;)
Is everything (including ppp negotiation) working fine between the endpoints?
Can you do a ping between them? Is loopback0 configured?

> gw-dsl#sh ip ospf interface Vi2.21
> Virtual-Access2.21 is up, line protocol is up
>   Internet Address 0.0.0.0/0, Area 0
>   Process ID 9026, Router ID 62.212.3.248, Network Type POINT_TO_POINT, Cost: 
> 100
>   Transmit Delay is 1 sec, State POINT_TO_POINT,
>   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
>     oob-resync timeout 40
>     Hello due in 00:00:00
>   Index 33/33, flood queue length 0
>   Next 0x0(0)/0x0(0)
>   Last flood scan length is 0, maximum is 0
>   Last flood scan time is 0 msec, maximum is 0 msec
>   Neighbor Count is 1, Adjacent neighbor count is 0
>   Suppress hello for 0 neighbor(s)
>   Message digest authentication enabled
>     Youngest key id is 1
> 

-- 
Tassos

> 
> 
> 2800 DSL Box:
> ------------------------------
> interface ATM0/1/0                                                   
>  no ip address                                                       
>  no atm ilmi-keepalive                                               
>  dsl operating-mode auto
>  pvc 8/35
>   encapsulation aal5mux ppp Virtual-Template1
> 
> interface Virtual-Template1
>  ip address negotiated
>  ip ospf message-digest-key 1 md5 7 xxx
>  ipv6 enable
>  ppp pap sent-username uli.adsl password 7 xxx
> 
> router ospf 9026
>  log-adjacency-changes
>  area 0 authentication message-digest
>  redistribute connected subnets
>  redistribute static metric 200 subnets
>  network 62.212.0.0 0.0.31.255 area 0
> 
> ---------
> 
> gw-milano#sh ip ospf interface Vi1.1
> Virtual-Access1.1 is up, line protocol is up
>   Internet Address 62.212.6.189/32, Area 0
>   Process ID 9026, Router ID 62.212.3.243, Network Type POINT_TO_POINT, Cost: 
> 284
>   Transmit Delay is 1 sec, State POINT_TO_POINT,
>   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
>     oob-resync timeout 40
>     Hello due in 00:00:07
>   Supports Link-local Signaling (LLS)
>   Index 5/5, flood queue length 0
>   Next 0x0(0)/0x0(0)
>   Last flood scan length is 0, maximum is 0
>   Last flood scan time is 0 msec, maximum is 0 msec
>   Neighbor Count is 0, Adjacent neighbor count is 0
>   Suppress hello for 0 neighbor(s)
>   Message digest authentication enabled
>     Youngest key id is 1
> 
> Bye,
>