mirror/xdp-project-bng-router
1
0
Fork 0
mirror of https://github.com/xdp-project/BNG-router.git synced 2024-05-06 15:54:53 +00:00
Code Issues Projects Releases Wiki Activity

Update README

Browse Source
This commit is contained in:
Yoel Caspersen
2021-10-15 10:17:03 +02:00
committed by GitHub
parent 09bc68580f
commit 37f30d5811
1 changed files with 74 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
dhcp-relay/README
View File

@ -28,4 +28,77 @@ sudo echo 1 > /proc/sys/net/ipv4/ip_forward
sudo echo 1 > /proc/sys/net/ipv4/conf/all/accept_local
Verify using tcpdump:
sudo tcpdump -s 0 -i <netif> port 67 and port 68 -vvv
sudo tcpdump -s 0 -i <netif> port 67 and port 68 -vvv
====== TEST SETUP ======
2 physical Linux servers connected back-to-back with a patch cable.
===== Client =====
Kernel: 5.4.0-72-generic
NIC model: Mellanox Technologies MT27800 Family [ConnectX-5]
NIC name: ens6f0
Preparation:
sudo ip link set ens6f0 up
sudo ip link add link ens6f0 name ens6f0.83 type vlan id 83
sudo ip link set ens6f0.83 up
sudo ip link add link ens6f0.83 name ens6f0.83.20 type vlan id 20
sudo ip link set ens6f0.83.20 up
Test:
sudo dhclient ens6f0.83.20
===== BNG =====
Kernel: 5.9.0-050900-lowlatency
NIC model: Mellanox Technologies MT27800 Family [ConnectX-5]
NIC name: ens6f0np0
Preparation:
sudo ip link set ens6f0np0 up
sudo ip link add link ens6f0np0 name ens6f0np0.83 type vlan id 83
sudo ip link set ens6f0np0.83 up
sudo ip link add link ens6f0np0.83 name ens6f0np0.83.20 type vlan id 20
sudo ip link set ens6f0np0.83.20 up
sudo ethtool -K ens6f0np0 rxvlan off
sudo echo 1 > /proc/sys/net/ipv4/conf/ens6f0np0.83.20/accept_local
sudo echo 1 > /proc/sys/net/ipv4/ip_forward
Test:
# Launch XDP program
sudo ./dhcp_user_xdp -i ens6f0np0 -d 192.168.4.20 -s 10.100.100.3
# tcpdump upstream interface to verify that packet is forwarded
sudo tcpdump -n -i eno1 port 67
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eno1, link-type EN10MB (Ethernet), capture size 262144 bytes
10:10:00.191071 IP 10.100.100.3.68 > 192.168.4.20.67: BOOTP/DHCP, Request from b8:59:9f:06:5a:98, length 300
10:10:03.114784 IP 10.100.100.3.68 > 192.168.4.20.67: BOOTP/DHCP, Request from b8:59:9f:06:5a:98, length 300
^C
2 packets captured
2 packets received by filter
0 packets dropped by kernel
# Open trace pipe to see debug messages from XDP program
sudo cat /sys/kernel/debug/tracing/trace_pipe
<idle>-0 [003] d.s2 11051597.318498: bpf_trace_printk: Ethertype 800
<idle>-0 [003] d.s2 11051597.318499: bpf_trace_printk: Found VLAN tag 83 at depth 0
<idle>-0 [003] d.s2 11051597.318500: bpf_trace_printk: Found VLAN tag 20 at depth 1
<idle>-0 [003] d.s2 11051597.318501: bpf_trace_printk: Parsing DHCP packet, opcode 1, hops 0
<idle>-0 [003] d.s2 11051597.318502: bpf_trace_printk: Broadcast packet received, opcode 1, hops 0
<idle>-0 [003] d.s2 11051597.318503: bpf_trace_printk: Got option code 53 at offset 290, hex 122
<idle>-0 [003] d.s2 11051597.318504: bpf_trace_printk: Got option code 12 at offset 293, hex 125
<idle>-0 [003] d.s2 11051597.318506: bpf_trace_printk: Got option code 55 at offset 304, hex 130
<idle>-0 [003] d.s2 11051597.318508: bpf_trace_printk: Got option code 255 at offset 319, hex 13f
<idle>-0 [003] d.s2 11051597.318509: bpf_trace_printk: Going to write DHCP option at offset 319
<idle>-0 [003] d.s2 11051597.318510: bpf_trace_printk: Wrote DHCP option at offset 290, returning XDP_PASS
^C