1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82 flush ruleset
table inet firewall {
chain inbound {
# By default, drop all traffic unless it meets a filter
# criteria specified by the rules that follow below.
type filter hook input priority 0;
policy drop;
# Allow traffic from established and related packets.
ct state established,related accept
# Drop invalid packets.
ct state invalid drop
# Allow local connections.
iifname lo accept
iifname brlan accept
# Allow all ICMP and IGMP traffic, but enforce a rate limit
# to help prevent some types of flood attacks.
ip protocol icmp limit rate 5/second accept
ip protocol igmp limit rate 5/second accept
ip6 nexthdr ipv6-icmp limit rate 5/second accept
# required for dhcp-pd to work!
udp dport dhcpv6-client accept
# Allow some ports
tcp dport ssh accept
tcp dport http accept
tcp dport https accept
tcp dport 8443 accept comment "step-ca"
tcp dport 22000 accept comment "syncthing"
udp dport 21027 accept comment "syncthing"
}
chain forward {
# By default, drop all traffic unless it meets a filter
type filter hook forward priority 0;
policy drop;
tcp flags syn tcp option maxseg size set rt mtu
# Allow traffic from established and related packets.
ct state established,related accept
# Drop invalid packets.
ct state invalid drop
# local clients can do whatever
iifname brlan accept
# Allow all ICMP and IGMP traffic, but enforce a rate limit
# to help prevent some types of flood attacks.
ip protocol icmp limit rate 5/second accept
ip protocol igmp limit rate 5/second accept
ip6 nexthdr ipv6-icmp limit rate 5/second accept
# drop incomming netbios traffic
tcp dport {139, 445} counter drop comment "silently drop NetBios"
udp dport {137, 138} counter drop comment "silently drop NetBios"
}
chain outbound {
# Allow all outbound traffic
type filter hook output priority 0
policy accept
}
}
table ip nat {
chain prerouting {
type nat hook prerouting priority -100
policy accept
}
chain postrouting {
type nat hook postrouting priority srcnat + 1; policy accept;
ip saddr 10.0.0.0/8 masquerade;
}
}