Server Fieldsedit

A Server is defined as the responder in a network connection for events regarding sessions, connections, or bidirectional flow records.

For TCP events, the server is the receiver of the initial SYN packet(s) of the TCP connection. For other protocols, the server is generally the responder in the network transaction. Some systems actually use the term "responder" to refer the server in TCP connections. The server fields describe details about the system acting as the server in the network event. Server fields are usually populated in conjunction with client fields. Server fields are generally not populated for packet-level events.

Client / server representations can add semantic context to an exchange, which is helpful to visualize the data in certain situations. If your context falls in that category, you should still ensure that source and destination are filled appropriately.

Server Field Detailsedit

Field Description Level

server.address

Some event server addresses are defined ambiguously. The event will sometimes list an IP, a domain or a unix socket. You should always store the raw address in the .address field.

Then it should be duplicated to .ip or .domain, depending on which one it is.

type: keyword

extended

server.bytes

Bytes sent from the server to the client.

type: long

example: 184

core

server.domain

Server domain.

type: keyword

core

server.ip

IP address of the server.

Can be one or multiple IPv4 or IPv6 addresses.

type: ip

core

server.mac

MAC address of the server.

type: keyword

core

server.nat.ip

Translated ip of destination based NAT sessions (e.g. internet to private DMZ)

Typically used with load balancers, firewalls, or routers.

type: ip

extended

server.nat.port

Translated port of destination based NAT sessions (e.g. internet to private DMZ)

Typically used with load balancers, firewalls, or routers.

type: long

extended

server.packets

Packets sent from the server to the client.

type: long

example: 12

core

server.port

Port of the server.

type: long

core

server.registered_domain

The highest registered server domain, stripped of the subdomain.

For example, the registered domain for "foo.example.com" is "example.com".

This value can be determined precisely with a list like the public suffix list (http://publicsuffix.org). Trying to approximate this by simply taking the last two labels will not work well for TLDs such as "co.uk".

type: keyword

example: example.com

extended

server.top_level_domain

The effective top level domain (eTLD), also known as the domain suffix, is the last part of the domain name. For example, the top level domain for example.com is "com".

This value can be determined precisely with a list like the public suffix list (http://publicsuffix.org). Trying to approximate this by simply taking the last label will not work well for effective TLDs such as "co.uk".

type: keyword

example: co.uk

extended

Field Reuseedit

Field sets that can be nested under Serveredit

Nested fields Description

server.as.*

Fields describing an Autonomous System (Internet routing prefix).

server.geo.*

Fields describing a location.

server.user.*

Fields to describe the user relevant to the event.