projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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. |