[c-nsp] Weird IPv6 problem passing Layer3 traffic

[Matthew Huff]

No, I don't have any CoPP defined (at least at the moment trying to debug it). No ACLs or anything else like that. The ISP keeps wanting me to send them my BGP configuration (which I've sent to at least 3 different people), rarther than looking at the obvious that BGP won't ever come up if we can't get a TCP session established.

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Matthew Huff             | 1 Manhattanville Rd
Director of Operations   | Purchase, NY 10577
OTA Management LLC       | Phone: 914-460-4039

From: John Neiberger [mailto:jneiberger at gmail.com]
Sent: Friday, June 28, 2013 10:56 AM
To: Matthew Huff
Cc: cisco-nsp (cisco-nsp at puck.nether.net); ipv6-ops at lists.cluenet.de
Subject: Re: [c-nsp] Weird IPv6 problem passing Layer3 traffic

Do you have CoPP configured? I've seen this exact behavior when I didn't have a permit statement for my neighbor or link address in the right ACL, so it was getting rate-limited to death.

On Fri, Jun 28, 2013 at 8:33 AM, Matthew Huff <mhuff at ox.com<mailto:mhuff at ox.com>> wrote:
Trying to bring up a new BGP peering session with a ISP. IPv4 peering is working fine on the same interface. The BGP peering fails early in trying to go active. Using "debug tcp transactions", I see the SYN going out, but no ACK ever returning. I can't telnet to their box on port 179 either (debug packet shows it doing the same, SYN begin sent, but no packets, including ACK). However, I can ping their interface.

The interface config has been stripped, and still doesn't work. I've reset the interface, and even rebooted our router, with no change in behavior.

We have a Cisco 7204VXR with NPE-G2, running 15.2(4)S1. I have an identical router with same version connected to another ISP and a tunnel to HE.net. It's not my first time at the rodeo. We are connected via metro Ethernet to a sub-interface on a JunOS box (model and version unknown). My suspicion is that either they have an ACL that's blocking it, or their BGP process isn't listening on that sub-interface. But they claim that it isn't their problem. I have zero JunOS experience and they seem to be flopping around.

Anyone have any idea what else the problem might be?

>From our side (simplied config to test):


interface FastEthernet2/1
 ip address 162.211.110.2 255.255.255.252
 speed auto
 duplex auto
 ipv6 address 2607:F518:15F::2/126
 ipv6 enable
end

rtr-inet2#show ipv6 cef 2607:F518:15F::1
2607:F518:15F::1/128
  attached to FastEthernet2/1

rtr-inet2#show ipv6 cef exact-route 2607:F518:15F::2 2607:F518:15F::1
2607:F518:15F::2 -> 2607:F518:15F::1 => IPV6 adj out of FastEthernet2/1, addr 2607:F518:15F::1

rtr-inet2#show ipv6 neighbors
IPv6 Address                              Age Link-layer Addr State Interface
2607:F518:15F::1                            0 0021.5903.1367  REACH Fa2/1

rtr-inet2#ping  2607:F518:15F::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2607:F518:15F::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

----
Matthew Huff             | 1 Manhattanville Rd
Director of Operations   | Purchase, NY 10577
OTA Management LLC       | Phone: 914-460-4039


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