IPV4 variable reference of Linux kernel parameters

Ip_autoconfig

Parameters: 0 or 1

1 means the IP address of the host is obtained via RARP,BOOTP,DHCP or other protocol

0 means disable

Ip_default_ttl

Parameters: 0-255

The default parameter is 64, and the variable tells the kernel what the time-to-live setting is at the default value of the packet leaving the host, and this value is not greater than 100.

Ip_dynaddr

Parameter: 0,1,2

Typically used for a dial-up connection, the system can immediately change the IP packet's source address to the IP destination address while interrupting the original TCP conversation and re-issuing a SYN request packet with the new address to start a new TCP conversation. When using IP spoofing, This parameter can immediately change the address masquerading as a new IP address. The parameter value of this parameter can be: 1 enable the function; 2 enable this feature with redundant mode; 0 Disable this feature.

Ip_forward

Parameter: 0,1

Check the network address packet forwarding in the system, 0 means disable, 1 is enabled, and some parameters are generally used when Linux is used as a road device.

Ip_local_port_range

Parameters: 0-65535

On the server side open the port range of the client connection server, if the service side of the memory is greater than 128MB, the lower limit is 32768, the upper limit of J 61000, if the memory is less than 128MB, the lower limit is 1024, the upper limit is 4999. You can freely limit the state of the server.

Ip_no_pmtu_disc

Parameter: 0,1

disabling or enabling PMTU (maximum transmission unit) is the maximum possible MTU detected on the client and server side.

Ip_nonlocal_bind

Parameter: 0,1

Allows us to set if the local process can bind to a non-local IP address. 0 indicates off, 1 means open.

Ipfrag_high_thresh

The maximum amount of memory for the kernel uses IP fragmentation reassembly.

This article is from the "Days Together" blog, please be sure to keep this source http://tongcheng.blog.51cto.com/6214144/1626721

IPV4 variable reference of Linux kernel parameters