If dev If is the last option on the command line, the word dev may be omitted, as it's the default. In most normal networks you won't need this. These flags are for diagnostic purposes, and are generally only set by routing daemons.įorce the route to be associated with the specified device, as the kernel will otherwise try to determine the device on its own (by checking already existing routes and device specifications, and where the route is added to). This is for example used to mask out networks before using the default route. Install a blocking route, which will force a route lookup to fail.
If omitted the RFC 1122 default of 300ms is used. Set the initial round trip time ( irtt) for TCP connections over this route to mmilliseconds ( 1- 12000). This is only used on AX.25 networks and with drivers unable to handle back to back frames. Set the TCP window size for connections over this route to Wbytes. This setting can be used to force smaller TCP packets on the other end when path mtu discovery does not work (usually because of misconfigured firewalls that block ICMP Fragmentation Needed) The default is the device MTU minus headers, or a lower MTU when path mtu discovery occurred. Set the TCP Maximum Segment Size (MSS) for connections over this route to M bytes. Set the metric field in the routing table (used by routing daemons) to M. If you specify the address of one of your localinterfaces, it will be used to decide about the interface to which the packets should be routed. This usually means that you have to set up a static route to the gateway beforehand. NOTE: The specified gateway must be reachable first. When adding a network route, the netmask to be used. You can provide IP addresses in dotted decimal or host/network names. ee will generate a very long line with all parameters from the routing table. Use netstat-format for displaying the routing table.
This is useful if you are trying to determine why the route to your nameserver has vanished. Show numerical addresses instead of trying to determine symbolic hostnames. Operate on the kernel's FIB (Forwarding Information Base) routing table. Use the specified address family (eg ' inet' use ' route -help' for a full list). Without these options, route displays the current contents of the routing tables. When the add or del options are used, route modifies the routing tables.
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