Citrix Systems 9.2 MX mail exchanger. This DNS record describes, Associated with the NS record

Chapter 6 Advanced Expressions: Parsing HTTP, TCP, and UDP Data 135

Prefixes that Extract TCP and UDP Data

GET Operation	Description
CLIENT.UDP.DNS.IS_MXREC	Returns a Boolean TRUE if the record is of type
	MX (mail exchanger). This DNS record describes
	a priority and a host name. The MX records for the
	same domain name specify the email servers in the
	domain and the priority for each server.
CLIENT.UDP.DNS.IS_NSREC	Returns a Boolean TRUE if the record is of type
	NS. This is a name server record that includes a
	host name with an associated A record. This
	enables locating the domain name that is
	associated with the NS record.
CLIENT.UDP.DNS.IS_PTRREC	Returns a Boolean TRUE if the record is of type
	PTR. This is a domain name pointer and is often
	used to associate a domain name with an IPv4
	address.
CLIENT.UDP.DNS.IS_SOAREC	Returns a Boolean TRUE if the record is of type
	SOA. This is a start of authority record.
CLIENT.UDP.DNS.IS_SRVREC	Returns a Boolean TRUE if the record is of type
	SRV. This is a more general version of the MX
	record.
CLIENT.UDP.DSTPORT	Returns the numeric ID of the current packet's
	UDP destination port.
CLIENT.UDP.SRCPORT	Returns the numeric ID of the current packet's
	UDP source port.
CLIENT.UDP.RADIUS	Returns RADIUS data for the current packet.
CLIENT.UDP.RADIUS.ATTR_	Returns the value for the attribute type specified as
TYPE(type)	the argument.
CLIENT.UDP.RADIUS.USERNAME	Returns the RADIUS user name.
CLIENT.TCP.MSS	Returns the maximum segment size (MSS) for the
	current connection as a number.
CLIENT.VLAN.ID	Returns the numeric ID of the VLAN through
	which the current packet entered the NetScaler.
SERVER.TCP.DSTPORT	Returns the numeric ID of the current packet's
	destination port.
SERVER.TCP.SRCPORT	Returns the numeric ID of the current packet's
	source port.
SERVER.VLAN	Operates on the VLAN through which the current
	packet entered the NetScaler.
SERVER.VLAN.ID	Returns the numeric ID of the VLAN through
	which the current packet entered the NetScaler.