Novell Documentation: Novell Internet Access Server 4.1

Configuration Using SET Options

The following SET options allow you to configure certain parameters from the command line on the host. The SET options are entered at the server console as commands, and the configuration changes made this way are applied to the whole system rather than to an individual interface.

ARP Cache Stale Timeout

Syntax	set arp entry expiry time = n
Description:	Specifies a timeout period (in seconds) for a cache table entry to be removed from the ARP cache table if the entry has not been used for some time.
Range:	240 to 14400 (seconds)
Default:	300

ARP Cache Update Timeout

Syntax:	set arp entry update time = n
Description:	Specifies a timeout period for a cache table entry to be removed from the ARP cache table if the entry has not been updated.
Range:	240 to 14400 (seconds)
Default:	300

BSD Socket Default Buffer Size

Syntax:	set bsd socket default buffer size in bytes = n
Description:	Sets the BSD Socket default send and receive buffer sizes.
Range:	4096 to 65536 (bytes)
Default:	32768

Discard Oversized Ping Packets

Syntax:	set discard oversized ping packets = string
Description:	Enable or disable discarding ping packets of size larger than the current ping packet size that is set to be received.
Range:	On \| Off
Default:	On (enabled)

Discard Oversized UDP Packets

Syntax:	set discard oversized udp packets = `string`
Description:	Enable or disable discarding UDP packets of size larger than the current ping packet size that is set to be received.
Range:	On \| Off
Default:	On (enabled)

IP Address Duplicates

Syntax:	set allow ip address duplicates = string
Description:	Binds the IP address even if it conflicts with another node in the network. (TCP/IP normally will not allow you to bind IP addresses that conflict with other nodes in the network.)
Range:	On \| Off
Default:	Off (disabled)

Large Windows

Syntax:	set tcp large window option = string
Description:	Enable or disable the Large Window option.
Range:	On \| Off
Default:	On (enabled)

Largest Ping Packet Size

Syntax:	set largest ping packet size = `n`
Description:	Set the size of the largest ping packet that can be received.
Range:	0 to 65535 (bytes)
Default:	10240

Largest UDP Packet Size

Syntax:	set large udp packet size = `n`
Description:	Set the size of the largest UDP packet that can be received.
Range:	0 to 65535 (bytes)
Default:	16384

Maximum Packet Receive Buffers

Syntax:	set maximum packet receive buffers = string
Description:	Allocate the maximum packet receive buffers to the server. This option can be set in the AUTOEXEC.NCF file. You can also use this option to fine-tune the server when it is stressed.
Range:	50 to 3303820 (packets)
Default:	10000

HINT: If you want to see the current value, do not assign any variable to set the parameter.

Maximum Pending TCP Connection Requests

Syntax:	set maximum pending tcp requests = `n`
Description:	Set the maximum number of pending TCP connections.
Range:	128 to 4096
Default:	128

Minimum Packet Receive Buffers

Syntax:	set minimum packet receive buffers = string
Description:	Allocate the minimum packet receive buffers to the server. This option can be set in the AUTOEXEC.NCF file. You can also use this option to fine-tune the server when it is stressed.
Range:	10 to 32768 (packets)
Default:	2000

Path MTU Black Hole Detection and Recovery

Syntax:	set tcp path mtu black hole detection and recovery = string
Description:	Enable or disable the Path MTU Black Hole Detection and Recovery option.
Range:	On \| Off
Default:	Off (disabled)

Selective Acknowledgement

Syntax:	set tcp sack option = string
Description:	Enable or disable the SACK option.
Range:	On \| Off
Default:	On (enabled)

TCP Diagnostic Services

Syntax:	set tcp diagnostic services = string
Description:	Enable or disable the echo, discard and chargen TCP diagnostic services on the NetWare^® system.
Range:	On \| Off
Default:	Off (disabled)

TCP Defend Fin Attacks

Syntax:	set maximum wait states = `n`
Description:	Enable or disable defense against Fin attacks.
Range:	1 to 100000
Default:	0 (disabled)

TCP Defend Land Attacks

Syntax:	set tcp defend land attacks = string
Description:	Enable or disable defense against land attacks.
Range:	On \| Off
Default:	On (enabled)

TCP Defend SYN Attacks

Syntax:	set tcp defend syn attacks = string
Description:	Enable or disable defense against SYN attacks.
Range:	On \| Off
Default:	Off (disabled)

TCP IP Maximum Small ECBs

Syntax:	set tcp ip maximum small ecbs = string
Description:	Change the maximum number of small ECBs on the server. You can also use this option to fine-tune the server when it is stressed.
Range:	512 to 65534 (packets)
Default:	1024

TOS Value

Syntax:	set tos for ip packets = n
Description:	Specifies a TOS value for all the outgoing IP datagrams through this interface. Assign a value to set the TOS and the precedence bits of the IP header for outgoing packets. To set only TOS bits, use a value between 0 and 15. To set the TOS and the precedence bits, use a value between 0 and 127.
Range:	0 to 127
Default:	0