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1 | Documentation for /proc/sys/net/* kernel version 2.4.0-test11-pre4 |
2 | (c) 1999 Terrehon Bowden <terrehon@pacbell.net> | |
3 | Bodo Bauer <bb@ricochet.net> | |
4 | (c) 2000 Jorge Nerin <comandante@zaralinux.com> | |
5 | (c) 2009 Shen Feng <shen@cn.fujitsu.com> | |
6 | ||
7 | For general info and legal blurb, please look in README. | |
8 | ||
9 | ============================================================== | |
10 | ||
11 | This file contains the documentation for the sysctl files in | |
12 | /proc/sys/net and is valid for Linux kernel version 2.4.0-test11-pre4. | |
13 | ||
14 | The interface to the networking parts of the kernel is located in | |
15 | /proc/sys/net. The following table shows all possible subdirectories.You may | |
16 | see only some of them, depending on your kernel's configuration. | |
17 | ||
18 | ||
19 | Table : Subdirectories in /proc/sys/net | |
20 | .............................................................................. | |
21 | Directory Content Directory Content | |
22 | core General parameter appletalk Appletalk protocol | |
23 | unix Unix domain sockets netrom NET/ROM | |
24 | 802 E802 protocol ax25 AX25 | |
25 | ethernet Ethernet protocol rose X.25 PLP layer | |
26 | ipv4 IP version 4 x25 X.25 protocol | |
27 | ipx IPX token-ring IBM token ring | |
28 | bridge Bridging decnet DEC net | |
cc79dd1b | 29 | ipv6 IP version 6 tipc TIPC |
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30 | .............................................................................. |
31 | ||
32 | 1. /proc/sys/net/core - Network core options | |
33 | ------------------------------------------------------- | |
34 | ||
0a14842f ED |
35 | bpf_jit_enable |
36 | -------------- | |
37 | ||
38 | This enables Berkeley Packet Filter Just in Time compiler. | |
39 | Currently supported on x86_64 architecture, bpf_jit provides a framework | |
40 | to speed packet filtering, the one used by tcpdump/libpcap for example. | |
41 | Values : | |
42 | 0 - disable the JIT (default value) | |
43 | 1 - enable the JIT | |
44 | 2 - enable the JIT and ask the compiler to emit traces on kernel log. | |
45 | ||
c60f6aa8 SW |
46 | dev_weight |
47 | -------------- | |
48 | ||
49 | The maximum number of packets that kernel can handle on a NAPI interrupt, | |
50 | it's a Per-CPU variable. | |
51 | Default: 64 | |
52 | ||
06021292 ET |
53 | low_latency_poll |
54 | ---------------- | |
55 | Low latency busy poll timeout. (needs CONFIG_NET_LL_RX_POLL) | |
56 | Approximate time in us to spin waiting for packets on the device queue. | |
57 | Recommended value is 50. May increase power usage. | |
58 | Default: 0 (off) | |
59 | ||
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60 | rmem_default |
61 | ------------ | |
62 | ||
63 | The default setting of the socket receive buffer in bytes. | |
64 | ||
65 | rmem_max | |
66 | -------- | |
67 | ||
68 | The maximum receive socket buffer size in bytes. | |
69 | ||
70 | wmem_default | |
71 | ------------ | |
72 | ||
73 | The default setting (in bytes) of the socket send buffer. | |
74 | ||
75 | wmem_max | |
76 | -------- | |
77 | ||
78 | The maximum send socket buffer size in bytes. | |
79 | ||
80 | message_burst and message_cost | |
81 | ------------------------------ | |
82 | ||
83 | These parameters are used to limit the warning messages written to the kernel | |
84 | log from the networking code. They enforce a rate limit to make a | |
85 | denial-of-service attack impossible. A higher message_cost factor, results in | |
86 | fewer messages that will be written. Message_burst controls when messages will | |
87 | be dropped. The default settings limit warning messages to one every five | |
88 | seconds. | |
89 | ||
90 | warnings | |
91 | -------- | |
92 | ||
93 | This controls console messages from the networking stack that can occur because | |
94 | of problems on the network like duplicate address or bad checksums. Normally, | |
95 | this should be enabled, but if the problem persists the messages can be | |
96 | disabled. | |
97 | ||
98 | netdev_budget | |
99 | ------------- | |
100 | ||
101 | Maximum number of packets taken from all interfaces in one polling cycle (NAPI | |
102 | poll). In one polling cycle interfaces which are registered to polling are | |
3cc7587b | 103 | probed in a round-robin manner. |
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104 | |
105 | netdev_max_backlog | |
106 | ------------------ | |
107 | ||
108 | Maximum number of packets, queued on the INPUT side, when the interface | |
109 | receives packets faster than kernel can process them. | |
110 | ||
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111 | netdev_tstamp_prequeue |
112 | ---------------------- | |
113 | ||
114 | If set to 0, RX packet timestamps can be sampled after RPS processing, when | |
115 | the target CPU processes packets. It might give some delay on timestamps, but | |
116 | permit to distribute the load on several cpus. | |
117 | ||
118 | If set to 1 (default), timestamps are sampled as soon as possible, before | |
119 | queueing. | |
120 | ||
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121 | optmem_max |
122 | ---------- | |
123 | ||
124 | Maximum ancillary buffer size allowed per socket. Ancillary data is a sequence | |
125 | of struct cmsghdr structures with appended data. | |
126 | ||
127 | 2. /proc/sys/net/unix - Parameters for Unix domain sockets | |
128 | ------------------------------------------------------- | |
129 | ||
45dad7bd LX |
130 | There is only one file in this directory. |
131 | unix_dgram_qlen limits the max number of datagrams queued in Unix domain | |
ca8b9950 | 132 | socket's buffer. It will not take effect unless PF_UNIX flag is specified. |
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133 | |
134 | ||
135 | 3. /proc/sys/net/ipv4 - IPV4 settings | |
136 | ------------------------------------------------------- | |
137 | Please see: Documentation/networking/ip-sysctl.txt and ipvs-sysctl.txt for | |
138 | descriptions of these entries. | |
139 | ||
140 | ||
141 | 4. Appletalk | |
142 | ------------------------------------------------------- | |
143 | ||
144 | The /proc/sys/net/appletalk directory holds the Appletalk configuration data | |
145 | when Appletalk is loaded. The configurable parameters are: | |
146 | ||
147 | aarp-expiry-time | |
148 | ---------------- | |
149 | ||
150 | The amount of time we keep an ARP entry before expiring it. Used to age out | |
151 | old hosts. | |
152 | ||
153 | aarp-resolve-time | |
154 | ----------------- | |
155 | ||
156 | The amount of time we will spend trying to resolve an Appletalk address. | |
157 | ||
158 | aarp-retransmit-limit | |
159 | --------------------- | |
160 | ||
161 | The number of times we will retransmit a query before giving up. | |
162 | ||
163 | aarp-tick-time | |
164 | -------------- | |
165 | ||
166 | Controls the rate at which expires are checked. | |
167 | ||
168 | The directory /proc/net/appletalk holds the list of active Appletalk sockets | |
169 | on a machine. | |
170 | ||
171 | The fields indicate the DDP type, the local address (in network:node format) | |
172 | the remote address, the size of the transmit pending queue, the size of the | |
173 | received queue (bytes waiting for applications to read) the state and the uid | |
174 | owning the socket. | |
175 | ||
176 | /proc/net/atalk_iface lists all the interfaces configured for appletalk.It | |
177 | shows the name of the interface, its Appletalk address, the network range on | |
178 | that address (or network number for phase 1 networks), and the status of the | |
179 | interface. | |
180 | ||
181 | /proc/net/atalk_route lists each known network route. It lists the target | |
182 | (network) that the route leads to, the router (may be directly connected), the | |
183 | route flags, and the device the route is using. | |
184 | ||
185 | ||
186 | 5. IPX | |
187 | ------------------------------------------------------- | |
188 | ||
189 | The IPX protocol has no tunable values in proc/sys/net. | |
190 | ||
191 | The IPX protocol does, however, provide proc/net/ipx. This lists each IPX | |
192 | socket giving the local and remote addresses in Novell format (that is | |
193 | network:node:port). In accordance with the strange Novell tradition, | |
194 | everything but the port is in hex. Not_Connected is displayed for sockets that | |
195 | are not tied to a specific remote address. The Tx and Rx queue sizes indicate | |
196 | the number of bytes pending for transmission and reception. The state | |
197 | indicates the state the socket is in and the uid is the owning uid of the | |
198 | socket. | |
199 | ||
200 | The /proc/net/ipx_interface file lists all IPX interfaces. For each interface | |
201 | it gives the network number, the node number, and indicates if the network is | |
202 | the primary network. It also indicates which device it is bound to (or | |
203 | Internal for internal networks) and the Frame Type if appropriate. Linux | |
204 | supports 802.3, 802.2, 802.2 SNAP and DIX (Blue Book) ethernet framing for | |
205 | IPX. | |
206 | ||
207 | The /proc/net/ipx_route table holds a list of IPX routes. For each route it | |
208 | gives the destination network, the router node (or Directly) and the network | |
209 | address of the router (or Connected) for internal networks. | |
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210 | |
211 | 6. TIPC | |
212 | ------------------------------------------------------- | |
213 | ||
214 | The TIPC protocol now has a tunable for the receive memory, similar to the | |
215 | tcp_rmem - i.e. a vector of 3 INTEGERs: (min, default, max) | |
216 | ||
217 | # cat /proc/sys/net/tipc/tipc_rmem | |
218 | 4252725 34021800 68043600 | |
219 | # | |
220 | ||
221 | The max value is set to CONN_OVERLOAD_LIMIT, and the default and min values | |
222 | are scaled (shifted) versions of that same value. Note that the min value | |
223 | is not at this point in time used in any meaningful way, but the triplet is | |
224 | preserved in order to be consistent with things like tcp_rmem. |