Re: [IPv6] [v6ops] [OPSEC] [EXTERNAL] Re: Why folks are blocking IPv6 extension headers? (Episode 1000 and counting) (Linux DoS)

["[e-mail]" <[e-mail]>]

Arnaud,
First, nice to hear from you.
Next, I think blocking EH without nuance or care is throwing out the baby with the bathwater.
IMHO, if we have problems with EH because people have not carefully considered their use.   I think if we do not make IPv6 an extensible and flexible protocol, we will be looking at creating a new version - IPv8?  IPv10? before we know it.
There are many problems with, for example, some TCP packets, and we do not say "just block TCP".
Thanks,

Nalini Elkins
CEO and Founder
Inside Products, Inc.
www.insidethestack.com
[phone] 

    On Thursday, May 25, 2023 at 12:23:02 AM PDT, Arnaud Taddei <arnaud.taddei=[e-mail]> wrote:  
 
 Ok Eduard I recognise a bit of the epidermic reaction (after all I am half latin blood) and missed the telco context because I see the drama in enterprise context every single day!
Now ironically the example I took below was a telco!
But I buy your point … all good

On 25 May 2023, at 07:58, Vasilenko Eduard <vasilenko.eduard=[e-mail]> wrote:

Hi Arnaud,It is a good point that Enterprises have much more serious attention to security. But Telco is not so much paranoid about security.The last initiative in this WG is about “to push Telco to tolerate all EHs”. The context of this discussion is more about Telco.  > The additional cost you can find ways to write them offIn the majority of cases “No”. Because tests could not be free, support could not be free either. Performance penalty may be close to Zero (only a small loss of bandwidth) – depending on the EH type (maybe a 2x drop of performance because of recirculation).  > the ‘additional cost’ and the ’security risk’ are not symmetric at all.Yes, it is an apple and orange comparison. But both exist, and both may be discussed.  Ed/From: Arnaud Taddei [mailto:arnaud.taddei=[e-mail]] 
Sent: Thursday, May 25, 2023 8:47 AM
To: Vasilenko Eduard <[e-mail]>
Cc: Fernando Gont <[e-mail]>; Manfredi (US), Albert E <[e-mail]>; IPv6 Operations <[e-mail]>; 6man <[e-mail]>; [e-mail]
Subject: Re: [OPSEC] [EXTERNAL] Re: [IPv6] [v6ops] Why folks are blocking IPv6 extension headers? (Episode 1000 and counting) (Linux DoS)  +1 just that the ‘additional cost’ and the ’security risk’ are not symmetric at all.  The additional cost you can find ways to write them off  The security risk is much more damaging because it is a compliancy risk (think DORA for the FSI in EU), a reputation risk that is now captured by credit rating agencies, a revenue risk, a  stock rating agencies (your stock will drop), insurance ratings, etc. and 1) it is getting substantial and 2) it is even existential with a few examples that some organizations literally lost e.g. an MNO of €1.3B and 30 years of existence (only survived by 1 backup link), etc  
On 25 May 2023, at 07:21, Vasilenko Eduard <vasilenko.eduard=[e-mail]> wrote:  IMHO: Fernando comes here with a good example (EH DoS). Security is a good reason to block EHs.
But for business, every feature should be tested, supported, and somebody should pay an additional performance penalty.
I am not sure which reason is bigger: additional cost or security risk. It depends on the organization type.
Ed/
-----Original Message-----
From: OPSEC [mailto:[e-mail]] On Behalf Of Arnaud Taddei
Sent: Thursday, May 25, 2023 8:12 AM
To: Fernando Gont <[e-mail]>
Cc: Manfredi (US), Albert E <[e-mail]>; IPv6 Operations <[e-mail]>; 6man <[e-mail]>; [e-mail]
Subject: Re: [OPSEC] [EXTERNAL] Re: [IPv6] [v6ops] Why folks are blocking IPv6 extension headers? (Episode 1000 and counting) (Linux DoS)

Would like to support Fernando again, and not just because I have a Sony TV too. 

Cybersecurity is in such a bad state that I can only plea for a sense of realism and pragmatism vs dogmatism to get real solutions at hand to the defenders practitioners

If not I will ask people here to consider spending a week in a Security Operation Center when there is a Ransomware breaking up 

Fernando’s paper intentions will be appreciated by the defenders  





On 25 May 2023, at 03:07, Fernando Gont <[e-mail]> wrote:



On 25/5/23 02:01, Manfredi (US), Albert E wrote:


-----Original Message-----
From: ipv6 <[e-mail]> On Behalf Of Fernando Gont


Given the amount of things that get connected to the Net (smart bulbs, refrigerators, etc.) -- and that will super-likely never receive security updates, you may have to **rely on your own network**.

For instance, I wouldn't have my smart TV "defend itself".
Agreed, "on your own network." >From the viewpoint of a household, whatever network defense has to be behind that household's router, for it to be credible, and preferably right in each host. Yeah, some IoT devices may not be updated regularly.

So, that's why people block them at the edge.

(just the messenger)





The ISP has to worry about protecting that ISP's own network. 

That's e.g. where RFC9098 comes in, with notes on why they are dropped in places other than the edge network.





Households have to be responsible for protecting their household's 
network. (And connected TVs do get regular software updates, as a 
matter of fact.)

I guess it all depends on the TV? e.g., I for one I'm not planning to throw it out just because Sony decided to quit pushing updates (which were never automatic for my set).

Thanks,
--
Fernando Gont
SI6 Networks
e-mail: [e-mail]
PGP Fingerprint: F242 FF0E A804 AF81 EB10 2F07 7CA1 321D 663B B494

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