https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235927
Bug ID: 235927
Summary: FreeBSD does not reply to ICMP requests when assigned
a Class-E address
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: lo...@cyberstorm.mu
Created attachment 202244
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202244&action=edit
FreeBSD icmp class-e fix
Due to the shrinkage of the IPv4 space, some people are looking at using
Class-E as a way to further expand the range of usable IPv4 addresses. In order
to make this happen, an audit is needed for FreeBSD to check for 240.0.0.0/4
assignment. When assigning a class-e ip to FreeBSD-12, it works except for
ICMP.
Example, when pinging the FreeBSD machine:
ping 240.0.1.199
PING 240.0.1.199 (240.0.1.199) 56(84) bytes of data.
^C
--- 240.0.1.199 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5088ms
However, SSH is accessible:
nc -v 240.0.1.199 22
Connection to 240.0.1.199 22 port [tcp/ssh] succeeded!
SSH-2.0-OpenSSH_7.8 FreeBSD-20180909
This attached patch removes the check for experimental/class-e range address
and allows ICMP to work.
ping 240.0.1.199
PING 240.0.1.199 (240.0.1.199) 56(84) bytes of data.
64 bytes from 240.0.1.199: icmp_seq=1 ttl=64 time=0.664 ms
64 bytes from 240.0.1.199: icmp_seq=2 ttl=64 time=0.860 ms
64 bytes from 240.0.1.199: icmp_seq=3 ttl=64 time=0.740 ms
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