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7/16/2018
03:00 PM

10 Ways to Protect Protocols That Aren't DNS

Here's how to safeguard three other network foundation protocols so they don't become weapons or critical vulnerabilities.
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BGP: Security From TTL
ACLs are the first, and most important, method for protecting BGP. In the next tier of protections is one that takes advantage of a broader mechanism of network protection: time to live (TTL).
TTL security is described in the Generalized TTL Security Mechanism (GTSM) found in IETF RFC 5082. Essentially, this says that a packet taking too long to reach you can't come from a neighbor - and if it's not from a neighbor, it can be discarded.
The basic method is to set the TTL to 255 (the maximum value), which requires that packets arrive from a direct connection. Since each layer 3 device that touches a packet decrements the TTL, no packet that has been bounced around can meet the requirement.
(Image: Min C. Chiu VIA SHUTTERSTOCK)

BGP: Security From TTL

ACLs are the first, and most important, method for protecting BGP. In the next tier of protections is one that takes advantage of a broader mechanism of network protection: time to live (TTL).

TTL security is described in the Generalized TTL Security Mechanism (GTSM) found in IETF RFC 5082. Essentially, this says that a packet taking too long to reach you can't come from a neighbor and if it's not from a neighbor, it can be discarded.

The basic method is to set the TTL to 255 (the maximum value), which requires that packets arrive from a direct connection. Since each layer 3 device that touches a packet decrements the TTL, no packet that has been bounced around can meet the requirement.

(Image: Min C. Chiu VIA SHUTTERSTOCK)

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Jon M. Kelley
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Jon M. Kelley,
User Rank: Moderator
7/19/2018 | 12:01:23 PM
Too many tabs, too little info
THis is the first time this year that I've gone through one of DRs multitab "specials".  To be honest this post subject still explains why I skip them:  too many slow loading tabs, with almost no relevant text per tab. Tabs with less than 100 words - get real.  Maybe I'll try again near Christmas.
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