IPsec async cryptography advanced setting - TCP traffic not passing through
Windows <-> SG2220 2.4.4-rel <---IPSEC---> SG3100 2.4.4-rel <-> Windows
IPsec (tunnel mode) with following settings:
P1 - mode Auto, AES128, SHA256, DH14
P2 - AES128GCM, no hash, PFS 14
ICMP between Win hosts is OK.
But SMB traffic is not going through with Async Crypto enabled on any side. I do see established TSP session. When I disable async crypto - SMB download immediately begin to flow.
Attached a packet dump sniffed on LAN of the 3100 - it is a snippet of the moment when async was disabled (lines 12-15) and SMB began to work.
Please refer also to trouble tickets 12812 and 12864 for additional details.
#1 Updated by Vladimir Lind 4 months ago
Repeated the same tests with different combination of HW:
SG4860 <--> SG2440 with enabled Async crypto on both sides - no problem with SMB traffic flow. Test OK.
SG4860 <--> SG3100 with enabled Async crypto on both sides - SMB is not being passed through. Disabled it only on 3100 - began to work. Test FAIL.
SG4860 <--> SG2220 with enabled Async crypto on both sides - no problem with SMB traffic flow. Test OK.
Note: all boxes had AES-NI crypto hw enabled - except 3100! (under Advanced>Misc)
I disabled AES-NI crypto hw on SG2220 and re-tested SG4860 <--> SG2220 enabled Async crypto on both sides - SMB is not being passed through. Disabled async mode - began to work. Test FAIL.
Re-tested SG4860 <--> SG3100 with enabled AES-NI crypto hw on both nodes. Hm, with enabled IPsec Async mode SMB traffic goes through but very slow 355Kb/s and less - it takes a very long time to finalize a humble SMB download. Disabling Async mode on 3100 makes things working.
Also tested SG4860 <--> SG3100 with disabled AES-NI crypto hw on both nodes and enabled IPsec Async mode. Works, but worse then with enabled AES-NI on SG4860 - saw a lot of pauses in SMB traffic transmission.
Trying to summarize what I see:
SG2220 with enabled AES-NI crypto hw AND enabled IPsec Async mode - OK.
SG2220 with enabled AES-NI crypto hw AND disabled IPsec Async mode - OK.
SG2220 with disabled AES-NI crypto hw AND and enabled IPsec Async mode - FAIL.
SG2220 with disabled AES-NI crypto hw AND and disabled IPsec Async mode - OK.
SG3100 with enabled AES-NI crypto hw AND enabled IPsec Async mode - FAIL - very slow bw throughput.
SG3100 with enabled AES-NI crypto hw AND disabled IPsec Async mode - OK.
SG3100 with disabled AES-NI crypto hw AND and enabled IPsec Async mode - FAIL - just not working.
SG3100 with disabled AES-NI crypto hw AND and disabled IPsec Async mode - OK.
*By AES-NI I mean AES-NI and cryptodev
#7 Updated by Clinton Cory 3 months ago
System -> Cryptographic:
AES-NI and BSD Crypto Device (aesni, cryptodev)
IPSec -> Advanced Settings -> Asynchronous Cryptography: Enabled
IPSec -> Tunnels:
AES128-GCM (128 bits)
P1 DH-Group: 2 (1024 bit)
No P2 Auth Methods
Running iperf3 across the IPsec tunnel with this topology:
CLIENT -> DUT-A -> DUT-B -> SERVER
Reports a couple Kbps once or twice, then traffic drops completely.
When I disable Async Crypto, I see 75Mbps consistently with PF disabled and 69Mbps with PF enabled (for some reason IPsec GCM is much slower than IPSec CBC).
This is running the latest 2.4.5 snapshot. FYI - The SG-5100 had no issues with this on 2.4.4.
#9 Updated by Paul Bucher 3 months ago
I'm seeing this bug occur on my SG-3100s when using one of the AES-GCM based algorithms for my IPSEC Phase2 with async crypto turned on.
If I switch to plain AES the issue goes away, which happens to use hardware based crypto on the SG-3100s(Which would be a better choice for my SG3100 <--> SG3100 connections probably). I also have SG-3100 <--> intel based pfsense boxes with AES-NI enabled on them. If I just turn off async on the SG-3100 side the problem also goes away. What I haven't tested is trying a non-hardware accelerated algorithm on the intel side with async crypto enabled.
In summary it appears to me that async crypto breaks non-hardware accelerated crypto algorithms or at least the AESXXX-GCM ones.