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Man Pages
FRAGTEST(8) FreeBSD System Manager's Manual FRAGTEST(8)

fragtest - test IP fragment reassembly behaviour

fragtest TESTS ... host

fragtest probes the remote host to determine its TCP/IP stack behaviour.

The TESTS may include any of the following (or may be specified as all to perform them all):

ping
Send an ICMP echo request to the host.
ip-opt
Send ICMP echo requests with different IP options, to see which IP options are supported.
frag
Send an ICMP echo request as 8-byte fragments.
frag-new
Send an ICMP echo request as 8-byte fragments with an overlapping 16-byte fragment, favoring newer data in reassembly.
frag-old
Send an ICMP echo request as 8-byte fragments with an overlapping 16-byte fragment, favoring older data in reassembly.
frag-timeout
Send an ICMP echo request as 8-byte fragments, omitting the last fragment, and wait for an ICMP time-exceeded-in-reassembly reply.

fragroute(8)

Dug Song <dugsong@monkey.org>

Firewalls or other filtering network devices may block IP fragments, packets with IP options, ICMP echo traffic, etc.

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