[c-nsp] Weird IPv6 problem passing Layer3 traffic

[John Neiberger]

I wonder if they have something similar to CoPP configured on their side. I
only have a little Juniper experience, but I think they may have a routing
engine filter inbound on their router (applied to their loopback interface)
that may be limiting this traffic. It's worth checking into. It's easy to
miss since they're probably looking at the BGP and interface configs. They
might not even be thinking about the RE filter. Hopefully someone with more
Juniper experience will come along and straighten me out if I'm wrong.

John


On Fri, Jun 28, 2013 at 8:59 AM, Matthew Huff <mhuff at ox.com> wrote:

> 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.****
>
> ** **
>
> ----****
>
> 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> 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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> ** **
>