[c-nsp] unable to ping from some source IP

[Yuri Selivanov]

	Hi!

> Hi guys,
>  
> I have a very strange issue encountered.
> I am not able to ping to one of customer's WAN IP (203.192.163.162) from
> some source IP.

> I am 100% sure that is nothing filtering it from our side.
> Anything wrong prohibiting it from below customer router's config?

	Your customer uses *classful* routing (no ip classless), so
when the router tries to forward icmp responses back to your host it DOES
NOT consider default route *if* your host's ip_addr belongs to 203.192.163/24
or 122/8.

> Cheers,
> Jimmy
>  
> ------------------------------------------------------------------------
> Current configuration : 1340 bytes
> !
> version 12.1
> no service single-slot-reload-enable
> service timestamps debug datetime
> service timestamps log datetime localtime
> service password-encryption
> !
> hostname PAC_3640
> !
> no logging rate-limit
> no logging monitor
> !
> clock timezone gmt 8
> ip subnet-zero
> !
> !
> no ip finger
> no ip domain-lookup
> !
> call rsvp-sync
> !         
> !
> !
> interface FastEthernet1/0
>  ip address 122.152.143.225 255.255.255.224
>  no ip redirects
>  no ip unreachables
>  no ip proxy-arp
>  no keepalive
>  speed 100
>  full-duplex
>  no cdp enable
> !
> interface Serial1/0               ----------------------> WAN Interface
>  bandwidth 2048
>  ip address 203.192.163.162 255.255.255.252
>  no ip redirects
>  no ip unreachables
>  no ip proxy-arp
>  fair-queue
>  no cdp enable
> !
> no ip classless
> ip route 0.0.0.0 0.0.0.0 203.192.163.161
> no ip http server
> !
> no cdp run
> !         
> dial-peer cor custom
> 
> ---------------------------------------------------------------------------
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-- 
Best Regards,
Yuri Selivanov -- [URI2-RIPE]