Hi, Could it be issue with a source port? It is described in the documentation, btw: https://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.3 On Sat, Jun 8, 2024, 03:51 Maria Matejka via Bird-users < bird-users@network.cz> wrote:
Hello!
On first sight this looks like Fortinet ignoring the packets. Maybe (wild guess) you have a firewall rule in place dropping them in the Fortinet?
Maria
On 7 June 2024 21:51:28 CEST, LIU Chris via Bird-users < bird-users@network.cz> wrote:
Classified as: {Hitachi Rail – Public}
My setup :
Linux running bird， Peer: Fortinet Firewall
In bird, configure bfd as below:
protocol bfd BFD_SD_01 {
interface "*" {
min rx interval 1000000 us;
min tx interval 1000000 us;
idle tx interval 1000000 ums;
multiplier 3;
};
neighbor 192.168.0.1 local 192.168.0.2;
}
Fortinet side, biasally same, also set rx intrva: 1000 ms, tx interval: 1000ms, multiplier: 3
However, both side show bfd DOWN。
Catpure tcpdump in Fortinet side, Fortinet IP: 192.168.0.1
Time source destination protocol info
1 0.000000 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
6 0.756375 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
11 1.519796 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
14 2.351177 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
19 3.225686 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
24 3.852938 192.168.0.1 192.168.0.2 BFD Control Diag: Control Detection Time Expired, State: Down, Flags: 0x00
25 3.981126 192.168.0.2 192.168.0.1 BFD Control Diag: No Diagnostic, State: Down, Flags: 0x00
from Fortinet neighbour information, it seems cannot receive control message from Peer, why? I don't have any block port. Why get detection time: 1500ms after neighboation
Below is fortinet bfd neighbor information
OurAddress NeighAddress State Interface LDesc/RDesc
192.168.0.1 192.168.0.2 DOWN STN2-SD-A 1/0/M
Local Diag: 1, Demand mode: no, Poll bit: unset
MinTxInt: 1000, MinRxInt: 1000, Multiplier: 3
Received: MinRxInt: 0 (ms), MinTxInt: 0 (ms), Multiplier: 3
Transmit Interval: 6500 (ms), Detection Time: 1500 (ms)
Rx Count: 0, Rx Interval; (ms) min/max/avg 0/0/0
Tx Count: 10287, Tx Interval (ms) min/max/avg 5000/5030/5000, last: 2350 (ms) ago
Registered protocols: Static BGP
Is this bird issue or fortinet? I suspect 80% caused by Fortiet, but I just want to get some suggestion/proposal from bird expert.
With Best Regards,
Chris LIU
Hitachi Rail – Public
{Hitachi Rail – Public}
-- Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.