I've said it before, and been argued with... this is one of many reasons
why you use iBGP to distribute {customer, dynamic pool, server subnets,
anything} routes, and use OSPF *only* to distribute router loopback
addresses. All your weird OSPF problems will go away. My apologies if
I'm misunderstanding the problem, but my point still stands.
On 08/25/2016 10:22 AM, Robert Haas wrote:
Alright, this problem has raised it head again on my network since I
started to renumber some PPPoE pools.
Customer gets a new IP address via PPPoE x.x.x.208/32 (from
x.x.x.192/27 pool). Customer can�t surf and I can�t ping them from my
office:
[office] � [Bernie Router] � [Braggcity Router] � [Ross Router] �
[Hayti Router] � [customer]
A traceroute from my office dies @ the Bernie router but I am not
getting any type of ICMP response from the Bernie router ie no ICMP
Host Unreachable/Dest unreachable etc � just blackholes after my
office router.
A traceroute from the Customer to the office again dies at the Bernie
router with no type of response.
Checking the routing table on the Bernie router shows a valid route
pointing to the Braggcity router. It is also in the OSPF LSA�s.
--
Another customer gets x.x.x.207/32 and has no issue at all.
--
Force the original customer to a new ip address of x.x.x.205/32 and
the service starts working again.
--
Now � even though there is no valid route to x.x.x.208/32 in the
routing table � traffic destined to the x.x.x.208/32 IP is still
getting blackholed.. I should be getting a Destination host
unreachable from the Bernie router.
This is correct the correct response .206 is not being used and there
is no route to it:
C:\Users\netadmin>ping x.x.x.206
Pinging x.x.x.206 with 32 bytes of data:
Reply from y.y.y.1: Destination host unreachable.
Reply from y.y.y.1: Destination host unreachable.
Ping statistics for x.x.x.206:
Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
C:\Users\netadmin>tracert 74.91.65.206
Tracing route to host-x.x.x.206.bpsnetworks.com [x.x.x.206]
over a maximum of 30 hops:
1 6 ms 6 ms 7 ms z.z.z.z
2 6 ms 6 ms 6 ms y.bpsnetworks.com [y.y.y.1]
3 y.bpsnetworks.com [y.y.y.1] reports: Destination host unreachable.
Trace complete.
This is what I see to x.x.x.208 even though it is not being used and
there is no route to it.
C:\Users\netadmin>ping x.x.x.208
Pinging x.x.x.208 with 32 bytes of data:
Request timed out.
Request timed out.
Ping statistics for x.x.x.208:
Packets: Sent = 2, Received = 0, Lost = 2 (100% loss),
C:\Users\netadmin>tracert x.x.x.208
Tracing route to host-x.x.x.208.bpsnetworks.com [x.x.x.208]
over a maximum of 30 hops:
1 6 ms 6 ms 6 ms z.z.z.z
2 * * * Request timed out.
3 * * ^C
--
I�ve verified there is no firewall that would affect the traffic � I
even put an accept rule in the forward chain for both the source and
destination of x.x.x.208 and neither increment at all. So the traffic
is not even making out of the routing flow and into the firewall..
Any pointers are where to start troubleshooting next?
!DSPAM:2,57bf295962076342819562!
