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24 November 2011

Manual:IP/Proxy

Example

To enable the proxy on port 8000:
[admin@MikroTik] ip proxy> set enabled=yes port=8000
[admin@MikroTik] ip proxy> print
                     enabled: yes
                 src-address: 0.0.0.0
                        port: 8000
                parent-proxy: 0.0.0.0:0
                 cache-drive: system
         cache-administrator: "dmitry@mikrotik.com"
         max-disk-cache-size: none
          max-ram-cache-size: 100000KiB
          cache-only-on-disk: yes
  maximal-client-connections: 1000
  maximal-server-connections: 1000
             max-object-size: 2000KiB
              max-fresh-time: 3d
[admin@MikroTik] ip proxy>
Remember to secure your proxy by preventing unauthorized access to it, otherwise it may be used as an open proxy. Also you need to setup destination NAT in order to utilize transparent proxying facility:
[admin@MikroTik] ip firewall nat> add chain=dstnat protocol=tcp dst-port=80 action=redirect to-ports=8000
[admin@MikroTik] ip firewall nat> print
Flags: X - disabled, I - invalid, D - dynamic
 0   chain=dstnat protocol=tcp dst-port=80 action=redirect to-ports=8000
[admin@MikroTik] ip firewall nat>

Access List

Sub-menu: /ip proxy access


Access list is configured like a regular firewall rules. Rules are processed from the top to the bottom. First matching rule specifies decision of what to do with this connection. There is a total of 6 classifiers that specify matching constraints. If none of these classifiers is specified, the particular rule will match every connection. If connection is matched by a rule, action property of this rule specifies whether connection will be allowed or not. If the particular connection does not match any rule, it will be allowed.
Property Description
action (allow | deny; Default: allow) Specifies whether to pass or deny matched packets
dst-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Destination address of the IP packet.
dst-host (string; Default: ) IP address or DNS name used to make connection the target server (this is the string user wrote in browser before specifying port and path to a particular web page
dst-port (integer[-integer[,integer[,...]]]: 0..65535; Default: ) List or range of ports the packet is destined to
local-port (integer: 0..65535; Default: ) Specifies the port of the web proxy via which the packet was received. This value should match one of the ports web proxy is listening on.
method (any | connect | delete | get | head | options | post | put | trace; Default: ) HTTP method used in the request (see HTTP Methods section in the end of this document)
path (string; Default: ) Name of the requested page within the target server (i.e. the name of a particular web page or document without the name of the server it resides on)
redirect-to (string; Default: ) In case access is denied by this rule, the user shall be redirected to the URL specified here
src-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Source address of the IP packet


Read only properties:
Property Description
hits (integer) Count of requests that were matched by this rule


Wildcard properties (dst-host and dst-path) match a complete string (i.e., they will not match "example.com" if they are set to "example"). Available wildcards are '*' (match any number of any characters) and '?' (match any one character). Regular expressions are also accepted here, but if the property should be treated as a regular expression, it should start with a colon (':'). Small hits in using regular expressions: \\ symbol sequence is used to enter \ character in console \. pattern means . only (in regular expressions single dot in pattern means any symbol) to show that no symbols are allowed before the given pattern, we use ^ symbol at the beginning of the pattern to specify that no symbols are allowed after the given pattern, we use $ symbol at the end of the pattern to enter [ or ] symbols, you should escape them with backslash \. It is strongly recommended to deny all IP addresses except those behind the router as the proxy still may be used to access your internal-use-only (intranet) web servers. Also, consult examples in Firewall Manual on how to protect your router.

Direct Access

Sub-menu: /ip proxy direct


If parent-proxy property is specified, it is possible to tell proxy server whether to try to pass the request to the parent proxy or to resolve it connecting to the requested server directly. Direct Access List is managed just like Proxy Access List described in the previous chapter except the action argument.
Unlike the access list, the direct proxy access list has default action equal to deny. It takes place when no rules are specified or a particular request did not match any rule.
Property Description
action (allow | deny; Default: allow) Specifies the action to perform on matched packets:
  • allow - always resolve matched requests directly bypassing the parent router
  • deny - resolve matched requests through the parent proxy. If no one is specified this has the same effect as allow.
dst-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Destination address of the IP packet.
dst-host (string; Default: ) IP address or DNS name used to make connection the target server (this is the string user wrote in browser before specifying port and path to a particular web page
dst-port (integer[-integer[,integer[,...]]]: 0..65535; Default: ) List or range of ports the packet is destined to.
local-port (integer: 0..65535; Default: ) Specifies the port of the web proxy via which the packet was received. This value should match one of the ports web proxy is listening on.
method (any | connect | delete | get | head | options | post | put | trace; Default: ) HTTP method used in the request (see HTTP Methods section in the end of this document)
path (string; Default: ) Name of the requested page within the target server (i.e. the name of a particular web page or document without the name of the server it resides on)
src-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Source address of the IP packet


Read only properties:
Property Description
hits (integer) Count of requests that were matched by this rule


Cache Management

Sub-menu: /ip proxy cache


Cache access list specifies, which requests (domains, servers, pages) have to be cached locally by web proxy, and which not. This list is implemented exactly the same way as web proxy access list. Default action is to cache object (if no matching rule is found).
Property Description
action (allow | deny; Default: allow) Specifies the action to perform on matched packets:
  • allow - cache objects from matched request
  • deny - do not cache objects from matched request
dst-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Destination address of the IP packet.
dst-host (string; Default: ) IP address or DNS name used to make connection the target server (this is the string user wrote in browser before specifying port and path to a particular web page
dst-port (integer[-integer[,integer[,...]]]: 0..65535; Default: ) List or range of ports the packet is destined to.
local-port (integer: 0..65535; Default: ) Specifies the port of the web proxy via which the packet was received. This value should match one of the ports web proxy is listening on.
method (any | connect | delete | get | head | options | post | put | trace; Default: ) HTTP method used in the request (see HTTP Methods section in the end of this document)
path (string; Default: ) Name of the requested page within the target server (i.e. the name of a particular web page or document without the name of the server it resides on)
src-address (Ip4[-Ip4 | /0..32] | Ip6/0..128; Default: ) Source address of the IP packet


Read only properties:
Property Description
hits (integer) Count of requests that were matched by this rule


Menu Specific commands


Connections

Sub-menu: /ip proxy connections


This menu conntains the list of current connections the proxy is serving.
Read only properties:
Property Description
client ()
dst-address (Ip4 | Ip6) IPv4/Ipv6 address of the connection
protocol (string) Protocol name
rx-bytes (integer) The amount of bytes received by the client
server ()
src-address (Ip4 | Ip6) Ipv4/ipv6 address of the connection originator
state (closing | connecting | converting | hotspot | idle | resolving | rx-header | tx-body | tx-eof | tx-header | waiting) Connection state:
  • closing - the data transfer is finished, and the connection is being finalized
  • connecting - establishing toe connection
  • converting - replacing header and footer fields in response or request paket
  • hotspot - check if hotspot authentication allows to continue (for hotspot proxy)
  • idle - staying idle
  • resolving - resolving server's DNS name
  • rx-header - receiving HTTP header
  • tx-body - transmitting HTTP body to the client
  • tx-eof - writing chunk-end (when converting to chunked response)
  • tx-header - transmitting HTTP header to the client
  • waiting - waiting for transmission form a peer
tx-bytes (integer) The amount of bytes sent by the client

Cache Inserts

Sub-menu: /ip proxy inserts
This menu shows statistics on objects stored in cache (cache inserts).
Read only properties:
Property Description
denied (integer) Number of inserts denied by the caching list.
errors (integer) Number of disk or other system-related errors
no-memory (integer) Number of objects not stored because there was not enough memory
successes (integer) Number of successfull cache inserts.
too-large (integer) Number of objects too large to store

Cache Lookups

Sub-menu: /ip proxy lookup


This menu shows statistics on objects read from cache (cache lookups).
Read only properties:
Property Description
denied (integer) Number of requests denied by the access list.
expired (integer) Number of requests found in cache, but expired, and, thus, requested from an external server
no-expiration-info (integer) Conditional request received for a page that does not have the information to compare the request with
non-cacheable (integer) Number of requests requested from the external servers unconditionally (as their caching is denied by the cache access list)
not-found (integer) Number of requests not found in the cache, and, thus, requested from an external server (or parent proxy if configured accordingly)
successes (integer) Number of requests found in the cache.

Cache Contents

Sub-menu: /ip proxy cache-contents
This menu shows cached contents.
Read only properties:
Property Description
file-size (integer) Cached object size
last-accessed (time)
last-accessed-time (time)
last-modified (time)
last-modified-time (time)
uri (string)


HTTP Methods

Options

This method is a request of information about the communication options available on the chain between the client and the server identified by the Request-URI. The method allows the client to determine the options and (or) the requirements associated with a resource without initiating any resource retrieval

GET

This method retrieves whatever information identified by the Request-URI. If the Request-URI refers to a data processing process than the response to the GET method should contain data produced by the process, not the source code of the process procedure(-s), unless the source is the result of the process.
The GET method can become a conditional GET if the request message includes an If-Modified-Since, If-Unmodified-Since, If-Match, If-None-Match, or If-Range header field. The conditional GET method is used to reduce the network traffic specifying that the transfer of the entity should occur only under circumstances described by conditional header field(-s).
The GET method can become a partial GET if the request message includes a Range header field. The partial GET method intends to reduce unnecessary network usage by requesting only parts of entities without transferring data already held by client.
The response to a GET request is cacheable if and only if it meets the requirements for HTTP caching.

HEAD

This method shares all features of GET method except that the server must not return a message-body in the response. This retrieves the metainformation of the entity implied by the request which leads to a wide usage of it for testing hypertext links for validity, accessibility, and recent modification.
The response to a HEAD request may be cacheable in the way that the information contained in the response may be used to update previously cached entity identified by that Request-URI.

POST

This method requests that the origin server accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI.
The actual action performed by the POST method is determined by the origin server and usually is Request-URI dependent.
Responses to POST method are not cacheable, unless the response includes appropriate Cache-Control or Expires header fields.

PUT

This method requests that the enclosed entity be stored under the supplied Request-URI. If another entity exists under specified Request-URI, the enclosed entity should be considered as updated (newer) version of that residing on the origin server. If the Request-URI is not pointing to an existing resource, the origin server should create a resource with that URI.
If the request passes through a cache and the Request-URI identifies one or more currently cached entities, those entries should be treated as stale. Responses to this method are not cacheable.

TRACE

This method invokes a remote, application-layer loop-back of the request message. The final recipient of the request should reflect the message received back to the client as the entity-body of a 200 (OK) response. The final recipient is either the origin server or the first proxy or gateway to receive a Max-Forwards value of 0 in the request. A TRACE request must not include an entity.
Responses to this method MUST NOT be cached

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