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| Property | Description |
|---|---|
| accept-redirects (yes | no; Default: no) | Whether to accept ICMP redirect messages. Typically should be enabled on a host and disabled on routers. |
| accept-source-route (yes | no; Default: no) | Whether to accept packets with the SRR option. Typically should be enabled on the router. |
| allow-fast-path (yes | no; Default: yes) | Allows Fast Path. |
| arp-timeout (time interval; Default: 30s) | Sets Linux base_reachable_time (base_reachable_time_ms) on all interfaces that use ARP. The initial validity of the ARP entry is picked from the interval [timeout/2 ..- 3*timeout/2] (default from 15s to 45s) after the neighbor was found. Can use postfix ms, s, m, h, d for milliseconds, seconds, minutes, hours, or days. if no postfix is set then seconds (s) are used. Parameter DOES NOT . The parameter means how long a valid ARP record will be considered complete if no one communicates with the specific MAC/IP during this time. The parameter does not represent a time when an ARP entry is removed from the ARP cache , ARP cache entries can be stored in the cache for up to 10minutes if the reference in a route cache is created(see max-neighbor-entries setting). |
| icmp-rate-limit (integer [0..4294967295]; Default: 10) | Limit the maximum rates for sending ICMP packets whose type matches icmp-rate-mask to specific targets. 0 to disable any limiting, otherwise the minimum space between responses in milliseconds. |
| icmp-rate-mask ([0..FFFFFFFF]; Default: 0x1818) | Mask made of ICMP types for which rates are being limited. More info in linux man pages |
| ip-forward (yes | no; Default: yes) | Enable/disable packet forwarding between interfaces. Resets all configuration parameters to defaults according to RFC1812 for routers. |
| rp-filter (loose | no | strict; Default: no) | Disables or enables source validation.
Warning: strict mode does not work with routing tables |
| secure-redirects (yes | no; Default: yes) | Accept ICMP redirect messages only for gateways, listed in the default gateway list. |
| send-redirects (yes | no; Default: yes) | Whether to send ICMP redirects. Recommended to be enabled on routers. |
| tcp-syncookies (yes | no; Default: no) | Send out syncookies when the syn backlog queue of a socket overflows. This is to prevent against the common 'SYN flood attack'. syncookies seriously violate TCP protocol, do not allow to use TCP extensions, can result in serious degradation of some services (f.e. SMTP relaying), visible not by you, but your clients and relays, contacting you. |
| max-neighbor-entries (integer [0..4294967295]; Default: ) | A Sets Linux gc_thresh3. A maximum number of allowed neighbors in the ARP table. Since RouterOS version 7.1, the default value depends on the installed amount of RAM. It is possible to set a higher value than the default, but it increases the risk of out of memory condition. The default values for certain RAM sizes:
The ARP cache stores ARP entries, and if some of these entries are incomplete, they can stay in the cache for an indefinite period of time. This will only happen if the number of entries in the cache is less than one-fourth of the maximum number allowed. The reason for this is to prevent the unnecessary running of the garbage-collector when the ARP table is not close to being full. |
| route-cache (yes | no; Default: yes) | Disable or enable Linux route cache. Note that by disabling the route cache, it will also disable the fast path. |
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