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shailparmar
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BGP Prefix are advertised , But unreachable.

Fri Dec 07, 2018 9:36 am

Hi
i am a newbie to bgp .
i have established a bgp session with the upstream provider successfully,i am getting bgp routes from the provider. my prefix is also advertised and route for the advertised prefix is added to the routing table in upstream provider router, but my prefix is still unreachable from wan side.
when doing tracert from wan side packets are dropping on providers router. what is am i missing ?.
 
VipITBE
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Re: BGP Prefix are advertised , But unreachable.

Fri Dec 07, 2018 11:57 am

Did you specify a source IP from inside your prefix?
It is likely that your provider is filtering traffic originating from a peering IP
 
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shailparmar
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Re: BGP Prefix are advertised , But unreachable.

Fri Dec 07, 2018 12:41 pm

It is likely that your provider is filtering traffic originating from a peering IP
Provider already created a out filter for accepting my prefix.
Did you specify a source IP from inside your prefix?
Didn't understand this.
 
VipITBE
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Re: BGP Prefix are advertised , But unreachable.

Fri Dec 07, 2018 12:48 pm

It is likely that your provider is filtering traffic originating from a peering IP
Provider already created a out filter for accepting my prefix.
Did you specify a source IP from inside your prefix?
Didn't understand this.
with /tool traceroute you can specify a source IP or interface from which the traceroute should originate. Starting a traceroute without that will start the traceroute with as source the IP from the interface where the route towards the external network lives. In your case the interface where your BGP peer is
 
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shailparmar
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Re: BGP Prefix are advertised , But unreachable.

Fri Dec 07, 2018 12:51 pm

with /tool traceroute you can specify a source IP or interface from which the traceroute should originate. Starting a traceroute without that will start the traceroute with as source the IP from the interface where the route towards the external network lives. In your case the interface where your BGP peer is
Yes I have tried with source ip and also interface where bgp peer is. In both situation packets are not forwarding.

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