Further investigation show that the "tx frame not ready" error counter on
the interface is going up.
show errors
Count Node Reason
[...]
1674 host-ens224-tx tx frame not ready
3020 host-ens224-tx tx sendto temporary
failure
It seems that somehow the interface is messed up. Anything I can do to
debug this further?
VPP is current from master branch, OS is Ubuntu 18.04.4 with
the 5.3.0-42-generic kernel.
Andreas
Am Fr., 3. Apr. 2020 um 11:03 Uhr schrieb Andreas Schultz via lists.fd.io
<andreas.schultz=travelping....@lists.fd.io>:
> Hi again,
>
> forget my first description of the problem. After using a VPP node handoff
> PCAP trace I've discovered that ARP answers are only send on the correct
> interface.
>
> Or at least VPP tries. The node trace shows that VPP tries to send the ARP
> answer (it hits host-ens224-tx), but the packet is not seen by a
> tcpdump/dumpcap on the raw host interface. It seems that somehow the
> af-packet interface is screwed.
>
> Andreas
>
> Am Fr., 3. Apr. 2020 um 10:46 Uhr schrieb Andreas Schultz via lists.fd.io
> <andreas.schultz=travelping....@lists.fd.io>:
>
>> Hi,
>>
>> I have two interfaces that are connected to the same layer L2 network.
>> Both interfaces have IPs from the same /24 IP range, but they are in
>> different FIBs.
>>
>> My problem is now that ARP are answered on the wrong interface (with the
>> correct MAC). With the attached config a ARP request for 172.20.16.105
>> (interface ens224) is answered on interface ens161.
>>
>> In itself the answer on the wrong interface would not be a big problem,
>> but the underlying switch is confused by seeing the MAC address on the
>> wrong interface.
>>
>> I could understand this behavior if both interfaces/IP where in the same
>> FIB, but they are not!
>>
>> It seems to me that the ARP responder node should filter by src/dst FIB
>> index? Is there an option or setting to enable that?
>>
>> Regards,
>> Andreas
>>
>> Config:
>> ip table add 1
>> ip table add 2
>>
>> create host-interface name ens224
>> set interface mac address host-ens224 00:0c:29:46:1f:53
>> set interface mtu 1500 host-ens224
>> set interface ip table host-ens224 1
>> set interface ip address host-ens224 172.20.16.105/24
>> set interface state host-ens224 up
>>
>> create host-interface name ens161
>> set interface mac address host-ens161 00:50:56:86:ed:f9
>> set interface mtu 1500 host-ens161
>> set interface ip table host-ens161 2
>> set interface ip address host-ens161 172.20.16.106/24
>> set interface state host-ens161 up
>>
>>
>>
>> --
>>
>> Andreas Schultz
>>
>>
>
> --
>
> Andreas Schultz
>
> --
>
> Principal Engineer
>
> t: +49 391 819099-224
>
> ------------------------------- enabling your networks
> -----------------------------
>
> Travelping GmbH
> Roentgenstraße 13
> 39108 Magdeburg
> Germany
>
> t: +49 391 819099-0
> f: +49 391 819099-299
>
> e: i...@travelping.com
> w: https://www.travelping.com/
> Company registration: Amtsgericht Stendal
> Geschaeftsfuehrer: Holger Winkelmann
> Reg. No.: HRB 10578
> VAT ID: DE236673780
>
>
--
Andreas Schultz
--
Principal Engineer
t: +49 391 819099-224
------------------------------- enabling your networks
-----------------------------
Travelping GmbH
Roentgenstraße 13
39108 Magdeburg
Germany
t: +49 391 819099-0
f: +49 391 819099-299
e: i...@travelping.com
w: https://www.travelping.com/
Company registration: Amtsgericht Stendal
Geschaeftsfuehrer: Holger Winkelmann
Reg. No.: HRB 10578
VAT ID: DE236673780
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