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 | ||
10 | nf_conntrack_buckets - INTEGER (read-only) | |
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. | |
c9f9e0e1 JP |
16 | |
17 | nf_conntrack_checksum - BOOLEAN | |
18 | 0 - disabled | |
19 | not 0 - enabled (default) | |
20 | ||
21 | Verify checksum of incoming packets. Packets with bad checksums are | |
22 | in INVALID state. If this is enabled, such packets will not be | |
23 | considered for connection tracking. | |
24 | ||
25 | nf_conntrack_count - INTEGER (read-only) | |
26 | Number of currently allocated flow entries. | |
27 | ||
28 | nf_conntrack_events - BOOLEAN | |
29 | 0 - disabled | |
30 | not 0 - enabled (default) | |
31 | ||
32 | If this option is enabled, the connection tracking code will | |
33 | provide userspace with connection tracking events via ctnetlink. | |
34 | ||
35 | nf_conntrack_events_retry_timeout - INTEGER (seconds) | |
36 | default 15 | |
37 | ||
38 | This option is only relevant when "reliable connection tracking | |
39 | events" are used. Normally, ctnetlink is "lossy", that is, | |
40 | events are normally dropped when userspace listeners can't keep up. | |
41 | ||
42 | Userspace can request "reliable event mode". When this mode is | |
43 | active, the conntrack will only be destroyed after the event was | |
44 | delivered. If event delivery fails, the kernel periodically | |
45 | re-tries to send the event to userspace. | |
46 | ||
47 | This is the maximum interval the kernel should use when re-trying | |
48 | to deliver the destroy event. | |
49 | ||
50 | A higher number means there will be fewer delivery retries and it | |
51 | will take longer for a backlog to be processed. | |
52 | ||
53 | nf_conntrack_expect_max - INTEGER | |
54 | Maximum size of expectation table. Default value is | |
55 | nf_conntrack_buckets / 256. Minimum is 1. | |
56 | ||
57 | nf_conntrack_frag6_high_thresh - INTEGER | |
58 | default 262144 | |
59 | ||
60 | Maximum memory used to reassemble IPv6 fragments. When | |
61 | nf_conntrack_frag6_high_thresh bytes of memory is allocated for this | |
62 | purpose, the fragment handler will toss packets until | |
63 | nf_conntrack_frag6_low_thresh is reached. | |
64 | ||
65 | nf_conntrack_frag6_low_thresh - INTEGER | |
66 | default 196608 | |
67 | ||
68 | See nf_conntrack_frag6_low_thresh | |
69 | ||
70 | nf_conntrack_frag6_timeout - INTEGER (seconds) | |
71 | default 60 | |
72 | ||
73 | Time to keep an IPv6 fragment in memory. | |
74 | ||
75 | nf_conntrack_generic_timeout - INTEGER (seconds) | |
76 | default 600 | |
77 | ||
78 | Default for generic timeout. This refers to layer 4 unknown/unsupported | |
79 | protocols. | |
80 | ||
81 | nf_conntrack_helper - BOOLEAN | |
82 | 0 - disabled | |
83 | not 0 - enabled (default) | |
84 | ||
85 | Enable automatic conntrack helper assignment. | |
86 | ||
87 | nf_conntrack_icmp_timeout - INTEGER (seconds) | |
88 | default 30 | |
89 | ||
90 | Default for ICMP timeout. | |
91 | ||
92 | nf_conntrack_icmpv6_timeout - INTEGER (seconds) | |
93 | default 30 | |
94 | ||
95 | Default for ICMP6 timeout. | |
96 | ||
97 | nf_conntrack_log_invalid - INTEGER | |
98 | 0 - disable (default) | |
99 | 1 - log ICMP packets | |
100 | 6 - log TCP packets | |
101 | 17 - log UDP packets | |
102 | 33 - log DCCP packets | |
103 | 41 - log ICMPv6 packets | |
104 | 136 - log UDPLITE packets | |
105 | 255 - log packets of any protocol | |
106 | ||
107 | Log invalid packets of a type specified by value. | |
108 | ||
109 | nf_conntrack_max - INTEGER | |
110 | Size of connection tracking table. Default value is | |
111 | nf_conntrack_buckets value * 4. | |
112 | ||
113 | nf_conntrack_tcp_be_liberal - BOOLEAN | |
114 | 0 - disabled (default) | |
115 | not 0 - enabled | |
116 | ||
117 | Be conservative in what you do, be liberal in what you accept from others. | |
118 | If it's non-zero, we mark only out of window RST segments as INVALID. | |
119 | ||
120 | nf_conntrack_tcp_loose - BOOLEAN | |
121 | 0 - disabled | |
122 | not 0 - enabled (default) | |
123 | ||
124 | If it is set to zero, we disable picking up already established | |
125 | connections. | |
126 | ||
127 | nf_conntrack_tcp_max_retrans - INTEGER | |
128 | default 3 | |
129 | ||
130 | Maximum number of packets that can be retransmitted without | |
131 | received an (acceptable) ACK from the destination. If this number | |
132 | is reached, a shorter timer will be started. | |
133 | ||
134 | nf_conntrack_tcp_timeout_close - INTEGER (seconds) | |
135 | default 10 | |
136 | ||
137 | nf_conntrack_tcp_timeout_close_wait - INTEGER (seconds) | |
138 | default 60 | |
139 | ||
140 | nf_conntrack_tcp_timeout_established - INTEGER (seconds) | |
141 | default 432000 (5 days) | |
142 | ||
143 | nf_conntrack_tcp_timeout_fin_wait - INTEGER (seconds) | |
144 | default 120 | |
145 | ||
146 | nf_conntrack_tcp_timeout_last_ack - INTEGER (seconds) | |
147 | default 30 | |
148 | ||
149 | nf_conntrack_tcp_timeout_max_retrans - INTEGER (seconds) | |
150 | default 300 | |
151 | ||
152 | nf_conntrack_tcp_timeout_syn_recv - INTEGER (seconds) | |
153 | default 60 | |
154 | ||
155 | nf_conntrack_tcp_timeout_syn_sent - INTEGER (seconds) | |
156 | default 120 | |
157 | ||
158 | nf_conntrack_tcp_timeout_time_wait - INTEGER (seconds) | |
159 | default 120 | |
160 | ||
161 | nf_conntrack_tcp_timeout_unacknowledged - INTEGER (seconds) | |
162 | default 300 | |
163 | ||
164 | nf_conntrack_timestamp - BOOLEAN | |
165 | 0 - disabled (default) | |
166 | not 0 - enabled | |
167 | ||
168 | Enable connection tracking flow timestamping. | |
169 | ||
170 | nf_conntrack_udp_timeout - INTEGER (seconds) | |
171 | default 30 | |
172 | ||
173 | nf_conntrack_udp_timeout_stream2 - INTEGER (seconds) | |
174 | default 180 | |
175 | ||
176 | This extended timeout will be used in case there is an UDP stream | |
177 | detected. |