Commit | Line | Data |
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c9f9e0e1 JP |
1 | /proc/sys/net/netfilter/nf_conntrack_* Variables: |
2 | ||
3 | nf_conntrack_acct - BOOLEAN | |
4 | 0 - disabled (default) | |
5 | not 0 - enabled | |
6 | ||
7 | Enable connection tracking flow accounting. 64-bit byte and packet | |
8 | counters per flow are added. | |
9 | ||
3183ab89 | 10 | nf_conntrack_buckets - INTEGER |
c9f9e0e1 JP |
11 | Size of hash table. If not specified as parameter during module |
12 | loading, the default size is calculated by dividing total memory | |
13 | by 16384 to determine the number of buckets but the hash table will | |
88eab472 ML |
14 | never have fewer than 32 and limited to 16384 buckets. For systems |
15 | with more than 4GB of memory it will be 65536 buckets. | |
3183ab89 | 16 | This sysctl is only writeable in the initial net namespace. |
c9f9e0e1 JP |
17 | |
18 | nf_conntrack_checksum - BOOLEAN | |
19 | 0 - disabled | |
20 | not 0 - enabled (default) | |
21 | ||
22 | Verify checksum of incoming packets. Packets with bad checksums are | |
23 | in INVALID state. If this is enabled, such packets will not be | |
24 | considered for connection tracking. | |
25 | ||
26 | nf_conntrack_count - INTEGER (read-only) | |
27 | Number of currently allocated flow entries. | |
28 | ||
29 | nf_conntrack_events - BOOLEAN | |
30 | 0 - disabled | |
31 | not 0 - enabled (default) | |
32 | ||
33 | If this option is enabled, the connection tracking code will | |
34 | provide userspace with connection tracking events via ctnetlink. | |
35 | ||
36 | nf_conntrack_events_retry_timeout - INTEGER (seconds) | |
37 | default 15 | |
38 | ||
39 | This option is only relevant when "reliable connection tracking | |
40 | events" are used. Normally, ctnetlink is "lossy", that is, | |
41 | events are normally dropped when userspace listeners can't keep up. | |
42 | ||
43 | Userspace can request "reliable event mode". When this mode is | |
44 | active, the conntrack will only be destroyed after the event was | |
45 | delivered. If event delivery fails, the kernel periodically | |
46 | re-tries to send the event to userspace. | |
47 | ||
48 | This is the maximum interval the kernel should use when re-trying | |
49 | to deliver the destroy event. | |
50 | ||
51 | A higher number means there will be fewer delivery retries and it | |
52 | will take longer for a backlog to be processed. | |
53 | ||
54 | nf_conntrack_expect_max - INTEGER | |
55 | Maximum size of expectation table. Default value is | |
56 | nf_conntrack_buckets / 256. Minimum is 1. | |
57 | ||
58 | nf_conntrack_frag6_high_thresh - INTEGER | |
59 | default 262144 | |
60 | ||
61 | Maximum memory used to reassemble IPv6 fragments. When | |
62 | nf_conntrack_frag6_high_thresh bytes of memory is allocated for this | |
63 | purpose, the fragment handler will toss packets until | |
64 | nf_conntrack_frag6_low_thresh is reached. | |
65 | ||
66 | nf_conntrack_frag6_low_thresh - INTEGER | |
67 | default 196608 | |
68 | ||
69 | See nf_conntrack_frag6_low_thresh | |
70 | ||
71 | nf_conntrack_frag6_timeout - INTEGER (seconds) | |
72 | default 60 | |
73 | ||
74 | Time to keep an IPv6 fragment in memory. | |
75 | ||
76 | nf_conntrack_generic_timeout - INTEGER (seconds) | |
77 | default 600 | |
78 | ||
79 | Default for generic timeout. This refers to layer 4 unknown/unsupported | |
80 | protocols. | |
81 | ||
82 | nf_conntrack_helper - BOOLEAN | |
83 | 0 - disabled | |
84 | not 0 - enabled (default) | |
85 | ||
86 | Enable automatic conntrack helper assignment. | |
87 | ||
88 | nf_conntrack_icmp_timeout - INTEGER (seconds) | |
89 | default 30 | |
90 | ||
91 | Default for ICMP timeout. | |
92 | ||
93 | nf_conntrack_icmpv6_timeout - INTEGER (seconds) | |
94 | default 30 | |
95 | ||
96 | Default for ICMP6 timeout. | |
97 | ||
98 | nf_conntrack_log_invalid - INTEGER | |
99 | 0 - disable (default) | |
100 | 1 - log ICMP packets | |
101 | 6 - log TCP packets | |
102 | 17 - log UDP packets | |
103 | 33 - log DCCP packets | |
104 | 41 - log ICMPv6 packets | |
105 | 136 - log UDPLITE packets | |
106 | 255 - log packets of any protocol | |
107 | ||
108 | Log invalid packets of a type specified by value. | |
109 | ||
110 | nf_conntrack_max - INTEGER | |
111 | Size of connection tracking table. Default value is | |
112 | nf_conntrack_buckets value * 4. | |
113 | ||
114 | nf_conntrack_tcp_be_liberal - BOOLEAN | |
115 | 0 - disabled (default) | |
116 | not 0 - enabled | |
117 | ||
118 | Be conservative in what you do, be liberal in what you accept from others. | |
119 | If it's non-zero, we mark only out of window RST segments as INVALID. | |
120 | ||
121 | nf_conntrack_tcp_loose - BOOLEAN | |
122 | 0 - disabled | |
123 | not 0 - enabled (default) | |
124 | ||
125 | If it is set to zero, we disable picking up already established | |
126 | connections. | |
127 | ||
128 | nf_conntrack_tcp_max_retrans - INTEGER | |
129 | default 3 | |
130 | ||
131 | Maximum number of packets that can be retransmitted without | |
132 | received an (acceptable) ACK from the destination. If this number | |
133 | is reached, a shorter timer will be started. | |
134 | ||
135 | nf_conntrack_tcp_timeout_close - INTEGER (seconds) | |
136 | default 10 | |
137 | ||
138 | nf_conntrack_tcp_timeout_close_wait - INTEGER (seconds) | |
139 | default 60 | |
140 | ||
141 | nf_conntrack_tcp_timeout_established - INTEGER (seconds) | |
142 | default 432000 (5 days) | |
143 | ||
144 | nf_conntrack_tcp_timeout_fin_wait - INTEGER (seconds) | |
145 | default 120 | |
146 | ||
147 | nf_conntrack_tcp_timeout_last_ack - INTEGER (seconds) | |
148 | default 30 | |
149 | ||
150 | nf_conntrack_tcp_timeout_max_retrans - INTEGER (seconds) | |
151 | default 300 | |
152 | ||
153 | nf_conntrack_tcp_timeout_syn_recv - INTEGER (seconds) | |
154 | default 60 | |
155 | ||
156 | nf_conntrack_tcp_timeout_syn_sent - INTEGER (seconds) | |
157 | default 120 | |
158 | ||
159 | nf_conntrack_tcp_timeout_time_wait - INTEGER (seconds) | |
160 | default 120 | |
161 | ||
162 | nf_conntrack_tcp_timeout_unacknowledged - INTEGER (seconds) | |
163 | default 300 | |
164 | ||
165 | nf_conntrack_timestamp - BOOLEAN | |
166 | 0 - disabled (default) | |
167 | not 0 - enabled | |
168 | ||
169 | Enable connection tracking flow timestamping. | |
170 | ||
171 | nf_conntrack_udp_timeout - INTEGER (seconds) | |
172 | default 30 | |
173 | ||
174 | nf_conntrack_udp_timeout_stream2 - INTEGER (seconds) | |
175 | default 180 | |
176 | ||
177 | This extended timeout will be used in case there is an UDP stream | |
178 | detected. |