Hi,
In VCPE usecase, did anyone encounter DHCP issue for BRG interface ??
Long story short:
BRGEMU (DHCP client) send DHCP request, forwarded by BNG (relay server) towards
DHCP server
DHCP server returns DHCP offer (port 67 -> port 67) to BNG …. but then it’s
somehow dropped and not forwarded back to BRGEMU !!
More detailed story:
It looks that main problem is that BRG doesn’t receive it’s IP (10.3.0.2) from
DHCP !!!
root@zdcpe1cpe01brgemu01-201908251807:~# vppctl show int address
GigabitEthernet0/4/0 (up):
local0 (dn):
tap-0 (up):
l2 bridge bd_id 10 shg 0
tap-1 (up):
20.0.0.40/24
root@zdcpe1cpe01brgemu01-201908251807:~# vppctl show hardware
Name Idx Link Hardware
GigabitEthernet0/4/0 1 up GigabitEthernet0/4/0
Ethernet address fa:16:3e:50:74:1c
Red Hat Virtio
carrier up full duplex speed 10000 mtu 9216
rx queues 1, rx desc 256, tx queues 1, tx desc 256
tx frames ok 101
tx bytes ok 32926
rx frames ok 4
rx bytes ok 224
If I understand it correctly, BRG should get IP address via DHCP – Option 82
(means BNG is relay host between BNG and DHCP server)
I also see some traffic on DHCP server for that MAC address, however don’t know
where replies got dropped
root@zdcpe1cpe01dhcp01-201908251807:~# tcpdump -i any port 67
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes
18:27:55.636784 IP 10.4.0.3.bootpc > 10.4.0.1.bootps: BOOTP/DHCP, Request from
fa:16:3e:50:74:1c (oui Unknown), length 307
18:27:55.639311 IP 10.4.0.1.bootps > 10.4.0.3.bootps: BOOTP/DHCP, Reply, length
290
18:28:00.641081 IP 10.4.0.3.bootpc > 10.4.0.1.bootps: BOOTP/DHCP, Request from
fa:16:3e:50:74:1c (oui Unknown), length 307
18:28:00.642956 IP 10.4.0.1.bootps > 10.4.0.3.bootps: BOOTP/DHCP, Reply, length
290
18:28:05.638780 IP 10.4.0.3.bootpc > 10.4.0.1.bootps: BOOTP/DHCP, Request from
fa:16:3e:50:74:1c (oui Unknown), length 307
18:28:05.641179 IP 10.4.0.1.bootps > 10.4.0.3.bootps: BOOTP/DHCP, Reply, length
290
On BNG it looks that traffic is flowing …
root@zdcpe1cpe01bng01-201908251807:~# vppctl show node count
Count Node Reason
185 vbng-dhcp-to-server DHCP packets relayed to the
server
183 vbng-dhcp-to-server DHCP packets relayed to
clients
1 vbng-dhcp-to-server DHCP packets failed to pass
the AAA check.
1 ip4-udp-lookup no error
8 ip6-input ip6 adjacency drop
5 ip4-glean ARP requests sent
2 ip4-icmp-input echo replies sent
2 arp-input ARP replies sent
2 arp-input ARP replies received
root@zdcpe1cpe01bng01-201908251807:~# vppctl show trace
------------------- Start of thread 0 vpp_main -------------------
Packet 1
00:18:02:693363: dpdk-input
GigabitEthernet0/4/0 rx queue 0
buffer 0x3618: current data 14, length 312, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x0
PKT MBUF: port 0, nb_segs 1, pkt_len 326
buf_len 2176, data_len 326, ol_flags 0x0, data_off 128, phys_addr 0x6a4d4500
packet_type 0x0
IP4: fa:16:3e:50:74:1c -> ff:ff:ff:ff:ff:ff
UDP: 0.0.0.0 -> 255.255.255.255
tos 0x00, ttl 128, length 312, checksum 0x39b6
fragment id 0x0000
UDP: 68 -> 67
length 292, checksum 0x0000
00:18:02:693414: ip4-input
UDP: 0.0.0.0 -> 255.255.255.255
tos 0x00, ttl 128, length 312, checksum 0x39b6
fragment id 0x0000
UDP: 68 -> 67
length 292, checksum 0x0000
00:18:02:693428: ip4-lookup
fib 0 dpo-idx 8 flow hash: 0x00000000
UDP: 0.0.0.0 -> 255.255.255.255
tos 0x00, ttl 128, length 312, checksum 0x39b6
fragment id 0x0000
UDP: 68 -> 67
length 292, checksum 0x0000
00:18:02:693434: ip4-local
UDP: 0.0.0.0 -> 255.255.255.255
tos 0x00, ttl 128, length 312, checksum 0x39b6
fragment id 0x0000
UDP: 68 -> 67
length 292, checksum 0x0000
00:18:02:693436: ip4-udp-lookup
UDP: src-port 68 dst-port 67
00:18:02:693439: vbng-dhcp-to-server
DHCP proxy: sent to server 10.4.0.1
original_sw_if_index: 1, sw_if_index: 1
00:18:02:693444: ip4-lookup
fib 0 dpo-idx 7 flow hash: 0x00000000
UDP: 10.4.0.3 -> 10.4.0.1
tos 0x00, ttl 128, length 335, checksum 0x2593
fragment id 0x0000
UDP: 68 -> 67
length 315, checksum 0x0000
00:18:02:693451: ip4-rewrite
tx_sw_if_index 2 dpo-idx 7 : ipv4 via 10.4.0.1 GigabitEthernet0/6/0:
fa163ecd2d63fa163e957b450800 flow hash: 0x00000000
00000000: fa163ecd2d63fa163e957b4508004500014f000000007f1126930a0400030a04
00000020: 000100440043013b00000101060005c3f82c00008000000000000000
00:18:02:693453: GigabitEthernet0/6/0-output
GigabitEthernet0/6/0
IP4: fa:16:3e:95:7b:45 -> fa:16:3e:cd:2d:63
UDP: 10.4.0.3 -> 10.4.0.1
tos 0x00, ttl 127, length 335, checksum 0x2693
fragment id 0x0000
UDP: 68 -> 67
length 315, checksum 0x0000
00:18:02:693455: GigabitEthernet0/6/0-tx
GigabitEthernet0/6/0 tx queue 0
buffer 0x3618: current data 0, length 349, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x0
IP4: fa:16:3e:95:7b:45 -> fa:16:3e:cd:2d:63
UDP: 10.4.0.3 -> 10.4.0.1
tos 0x00, ttl 127, length 335, checksum 0x2693
fragment id 0x0000
UDP: 68 -> 67
length 315, checksum 0x0000
Packet 2
00:18:02:696453: dpdk-input
GigabitEthernet0/6/0 rx queue 0
buffer 0xf3f: current data 14, length 318, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x1
PKT MBUF: port 1, nb_segs 1, pkt_len 332
buf_len 2176, data_len 332, ol_flags 0x0, data_off 128, phys_addr 0x6a438ec0
packet_type 0x0
IP4: fa:16:3e:cd:2d:63 -> fa:16:3e:95:7b:45
UDP: 10.4.0.1 -> 10.4.0.3
tos 0x10, ttl 128, length 318, checksum 0xe593
fragment id 0x0000, flags DONT_FRAGMENT
UDP: 67 -> 67
length 298, checksum 0x3375
00:18:02:696473: ip4-input
UDP: 10.4.0.1 -> 10.4.0.3
tos 0x10, ttl 128, length 318, checksum 0xe593
fragment id 0x0000, flags DONT_FRAGMENT
UDP: 67 -> 67
length 298, checksum 0x3375
00:18:02:696486: ip4-lookup
fib 0 dpo-idx 6 flow hash: 0x00000000
UDP: 10.4.0.1 -> 10.4.0.3
tos 0x10, ttl 128, length 318, checksum 0xe593
fragment id 0x0000, flags DONT_FRAGMENT
UDP: 67 -> 67
length 298, checksum 0x3375
00:18:02:696487: ip4-local
UDP: 10.4.0.1 -> 10.4.0.3
tos 0x10, ttl 128, length 318, checksum 0xe593
fragment id 0x0000, flags DONT_FRAGMENT
UDP: 67 -> 67
length 298, checksum 0x3375
00:18:02:696488: ip4-udp-lookup
UDP: src-port 67 dst-port 67
00:18:02:696489: vbng-dhcp-to-client
DHCP proxy: broadcast to client from 10.3.0.1
original_sw_if_index: 1, sw_if_index: 1
BUT on BRG it’s somehow dead
root@zdcpe1cpe01brgemu01-201908251807:~# vppctl show node count
Count Node Reason
7 tapcli-rx no error
2 ip6-input ip6 adjacency drop
7 l2-learn L2 learn packets
1 l2-learn L2 learn misses
6 l2-learn L2 learn hits
7 l2-input L2 input packets
7 l2-flood L2 flood packets
7 l2-flood L2 replication complete
4 arp-input IP4 destination address not
local to subnet
root@zdcpe1cpe01brgemu01-201908251807:~# vppctl trace add dpdk-input 10
root@zdcpe1cpe01brgemu01-201908251807:~# vppctl show trace
------------------- Start of thread 0 vpp_main -------------------
No packets in trace buffer
(restart of BRG will not allow interfaces to setup properly, so fastest way for
restore it is to run ./vcpe.py infra)
Any hint very appreciated …
Thank you,
Michal
PS: I am now using same VCPE images on integration lab (just for case 😊)
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