Hi vpp-dev,
I'm testing security group functions on VPP19.08, and got some questions here.
I have two vms: A(172.16.0.1/24, using vxlan_tunnel10 / bridge 10) and
B(172.16.1.1/24, using vxlan_tunnel11 / bridge 11). Both these two networks'
gateway is X.254, configured on VPP bridges (10 and 11). And now A/B are
reachable from each other.
I try to configure acl as follow:
vat# acl_dump 4
vl_api_acl_details_t_handler:223: acl_index: 4, count: 3
tag {}
ipv4 action 0 src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535 dport 0-65535
tcpflags 0 mask 0,
ipv4 action 1 src 0.0.0.0/0 dst 0.0.0.0/0 proto 6 sport 0-65535 dport 0-65535
tcpflags 0 mask 0
vat#
vat# acl_interface_set_acl_list sw_if_index 1 input 4
This rule is expected to
1. deny icmp packets, and
2. allow tcp packets
but after applied to interface vxlan_tunnel10, ALL packets are deneid.
And after so much researches, I found
https://lists.fd.io/g/vpp-dev/topic/10642768#8144 that VPP has an implicit
"deny all" in the end, so I add one more rule "permit all":
vat# acl_dump 4
vl_api_acl_details_t_handler:223: acl_index: 4, count: 3
tag {}
ipv4 action 0 src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535 dport 0-65535
tcpflags 0 mask 0,
ipv4 action 1 src 0.0.0.0/0 dst 0.0.0.0/0 proto 6 sport 0-65535 dport 0-65535
tcpflags 0 mask 0,
ipv4 action 1 src 0.0.0.0/0 dst 0.0.0.0/0 proto 0 sport 0-65535 dport 0-65535
tcpflags 0 mask 0
vat#
And now, ALL packets has been permited.
So these are my questions:
Q1: Why tcp packets still be dropped even has an explicit "allow ipv4 tcp
packets" rule?
Q2: Why all packets are permitted after appending the "permit all"?
Q3: Since VPP docs are so pool, are there any official docs can be found that
refer this "implicit deny all" and others (since so few non-officical docs can
be found)?
Thanks.
Cipher Chen
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