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Oct 18, 2025
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Docs detailing the risks of allowing IPv6 RAs #323

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5 changes: 3 additions & 2 deletions README.md
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Expand Up @@ -121,8 +121,9 @@ configuration file and significant hardening is applied to a myriad of component
- Disable source routing which allows users to redirect network traffic that
can result in man-in-the-middle attacks.

- Do not accept IPv6 router advertisements and solicitations.

- Do not accept IPv6 router advertisements (RAs) and solicitations which can result
in both man-in-the-middle and denial-of-service attacks.

- Optional - Disable SACK and DSACK as they have historically been a known
vector for exploitation.

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10 changes: 9 additions & 1 deletion usr/lib/sysctl.d/990-security-misc.conf#security-misc-shared
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Expand Up @@ -515,7 +515,15 @@ net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.conf.*.accept_source_route=0
net.ipv6.conf.*.accept_source_route=0

## Do not accept IPv6 router advertisements and solicitations.
## Do not accept IPv6 router advertisements (RAs) and solicitations.
## RAs are unsecured and unauthenticated and any device on the local link can send and accept them without verification.
## Malicious RAs can activate IPv6 connectivity on dormant hosts leading to unauthorized access.
## Flooding the network with malicious RAs can lead to denial of service attacks.
## Rogue RAs can lead to interception of all network traffic by setting the attacker's system as the default gateway.
##
## https://datatracker.ietf.org/doc/html/rfc6104
## https://datatracker.ietf.org/doc/html/rfc6105
## https://archive.conference.hitb.org/hitbsecconf2012kul/materials/D1T2%20-%20Marc%20Heuse%20-%20IPv6%20Insecurity%20Revolutions.pdf
##
net.ipv6.conf.*.accept_ra=0

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