How to search junos configuration option within cli help apropos

How to search junos configuration option within cli [help apropos]

To quickly find a JUNOS configuration option always use "help apropos" operational command. It can be used even if the full junos syntax is not known.

"help apropos" will return a list of configuration mode commands containing the keyword argument.

Here is how to search how to change tcp MSS for all tcp sessions globally in Juniper SRX:

Code:

user@srx-junos> help apropos mss                     
help topic bgp tcp-mss 
    Maximum segment size for TCP connections to neighbors
help topic system tcp-mss 
    Maximum segment size for TCP packets
help reference security tcp-mss 
    Configure TCP maximum segment size
help reference security mss 
    Specify maximum segment size in TCP header
help reference security ipsec-vpn-flow 
    TCP MSS for TCP packets bound for VPN tunnel
help reference security gre-in 
    TCP MSS for GRE packets from VPN tunnel
help reference security gre-out 
    TCP MSS for GRE packets to VPN tunnel
help reference services tcp-mss 
    Maximum TCP segment size for service set
help reference services mss 
    TCP delayed binding MSS value
help reference system tcp-mss 
    Maximum segment size for TCP packets
help reference bgp tcp-mss 
    Maximum segment size for TCP connections to neighbors

user@srx-junos> help apropos mss | match flow 
help reference security ipsec-vpn-flow 

user@srx-junos> help reference security ipsec-vpn-flow 
ipsec-vpn (Security Flow)

  Syntax

     ipsec-vpn {
         mss value;
     }

  Hierarchy Level

     [edit security flow tcp-mss]

  Release Information

     Statement introduced in Release 8.5 of Junos OS.

  Description

     Specify the TCP maximum segment size (TCP MSS) for the TCP packets that
     are about to go into an IPsec VPN tunnel. This value overrides the value
     specified in the all-tcp-mss statement.

  Options

     mss value-TCP MSS value for TCP packets entering an IPsec VPN tunnel.
     Value is optional.
         Range: 64 through 65,535 bytes
         Default: 1320 bytes

  Required Privilege Level

     security-To view this statement in the configuration.
     security-control-To add this statement to the configuration.

  Related-Topics

        * IPsec VPNs for Security Devices