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In both Internet Protocol versions, header options are available to use source routing.

In IPv4, two header options are available which are rarely used: "strict source and record route" (SSRR) and "loose source and record route" (LSRR).^[1] Because of security concerns, packets marked LSRR are frequently blocked on the Internet. If not blocked, LSRR can allow an attacker to spoof its address but still successfully receive response packets.^[2]

In IPv6, the routing extension header is used to direct a packet to one or more intermediate nodes before being sent to its destination. Similar security issues were found for the routing extension header with Routing Type 0.^[3] Therefore, this particular routing type was deprecated in 2007.^[4]

References

^ Internet Protocol. IETF. September 1981. doi:10.17487/RFC0791. RFC 791.
^ Rik Farrow. "Source Address Spoofing". TechNet. Microsoft Corporation.
^ Philippe Biondi, Arnoud Ebalard (April 2007). "IPv6 Routing Header Security" (pdf). EADS. Retrieved 3 December 2010. Type 0: the evil mechanism...
^ J. Abley; P. Savola; G. Neville-Neil (December 2007), Deprecation of Type 0 Routing Headers in IPv6, RFC 5095

[1] Internet Protocol. IETF. September 1981. doi:10.17487/RFC0791. RFC 791.

[2] Rik Farrow. "Source Address Spoofing". TechNet. Microsoft Corporation.

[3] Philippe Biondi, Arnoud Ebalard (April 2007). "IPv6 Routing Header Security" (pdf). EADS. Retrieved 3 December 2010. Type 0: the evil mechanism...

[rfc5095-4] J. Abley; P. Savola; G. Neville-Neil (December 2007), Deprecation of Type 0 Routing Headers in IPv6, RFC 5095

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