connectivity: Disable Reverse Path Filtering for ping #6375
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For the guest with multiple interfaces, the asymmetric routing
may send the ICMP packets from one interface and receive them
by another interface. For example:
\# ping 1.1.1.1 -I enp7s0
PING 1.1.1.1 (1.1.1.1) from 192.168.122.252 enp7s0: 56(84) bytes of data
Capturing on 'enp1s0'
1 0.000000000 1.1.1.1 → 192.168.122.252 ICMP 98 Echo (ping) reply id=0x0007, seq=1295/3845, ttl=52
2 0.511943887 1.1.1.1 → 192.168.122.252 ICMP 98 Echo (ping) reply id=0x000c, seq=29/7424, ttl=52
If the rp_filter[1] is enabled, Linux will refuse the replied ICMP packets
and cause packets loss.
[1]: https://sysctl-explorer.net/net/ipv4/rp_filter/
Signed-off-by: Han Han <[email protected]>
|
Test result on v11.4.0-70-g07a8be20c1 |
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For the guest with multiple interfaces, the asymmetric routing may send the ICMP packets from one interface and receive them by another interface. For example:
# ping 1.1.1.1 -I enp7s0
PING 1.1.1.1 (1.1.1.1) from 192.168.122.252 enp7s0: 56(84) bytes of data
Capturing on 'enp1s0'
1 0.000000000 1.1.1.1 → 192.168.122.252 ICMP 98 Echo (ping) reply id=0x0007, seq=1295/3845, ttl=52
2 0.511943887 1.1.1.1 → 192.168.122.252 ICMP 98 Echo (ping) reply id=0x000c, seq=29/7424, ttl=52
If the rp_filter1 is enabled, Linux will refuse the replied ICMP packets and cause packets loss.