Re: [IPsec] comments on esp-null-heuristics-01

2009-11-25 Thread Tero Kivinen
Michael Richardson writes: > Tero> How does that disagree in their definition of flow? > > A flow in the routing and ASIC space is an origin/destination IP address > pair only. A microflow is the 5-tuple. Never heard about microflow before. Wikipedia says: Applied to Internet routers,

Re: [IPsec] comments on esp-null-heuristics-01

2009-11-24 Thread Tero Kivinen
Michael Richardson writes: > >> It is? I'll bet 95% of actual transport mode IPsec has an L2TP > >> layer inside. > > Tero> Inside one enterprise? I do not think so. I guess most of the > Tero> IPsec traffic is VPN style tunnel mode, but as that is going > Tero> over untrusted

[IPsec] comments on esp-null-heuristics-01

2009-11-23 Thread Tero Kivinen
Michael Richardson writes: > >As end nodes might be able to > > bypass those checks by using encrypted ESP instead of ESP-NULL, these > > kinds of scenarios also require very specific policies to forbid such > > circumvention. > > The question is, are these end-nodes malicious, or ar

[IPsec] comments on esp-null-heuristics-01

2009-11-11 Thread Michael Richardson
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 >As end nodes might be able to > bypass those checks by using encrypted ESP instead of ESP-NULL, these > kinds of scenarios also require very specific policies to forbid such > circumvention. The question is, are these end-nodes malicio