Does the FLEX50/200 support CBC for VPN?
Master Member
I am looking to connect a Yealink T48 IPphone via VPN to a FLEX50 or FLEX200.
#1 Here is a guide I found: OpenVPN Yealink VPN
#2 Another guide (in German): Yealink VPN German
This explains possible cypher options:
Yealink devices support no other hash algos than SHA1 or MD5!.
Supported ciphers are AES-128-CBC, AES-256-CBC or BF-CBC.
So before I dive into this, I'd rather ask :-)
Would this be feasible?
Best Answers
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Hello @StefanZ
you can check the cipher by
Router(config)# show ip http server secure cipher-listThen you will see AES-128-CBC and AES-256-CBC
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Hello @StefanZ
The stronger ciphers are enabled by default. Please disable it first and check the cipher list again.
Router# configure terminal
Router(config)# no ip http secure-server strong-cipher
Router(config)# show ip http server secure cipher-listCurrent available cipher suites:
TLS_AES_256_GCM_SHA384 TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any Au=any Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-ECDSA-ARIA256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=ARIAGCM(256) Mac=AEAD
ECDHE-ARIA256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=ARIAGCM(256) Mac=AEAD
ECDHE-ECDSA-ARIA128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=ARIAGCM(128) Mac=AEAD
ECDHE-ARIA128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=ARIAGCM(128) Mac=AEAD
RSA-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=RSAPSK Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
DHE-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=DHEPSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=ECDHEPSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
RSA-PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=RSAPSK Au=RSA Enc=ARIAGCM(256) Mac=AEAD
DHE-PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=DHEPSK Au=PSK Enc=ARIAGCM(256) Mac=AEAD
PSK-CHACHA20-POLY1305 TLSv1.2 Kx=PSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=PSK Au=PSK Enc=ARIAGCM(256) Mac=AEAD
RSA-PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=RSAPSK Au=RSA Enc=ARIAGCM(128) Mac=AEAD
DHE-PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=DHEPSK Au=PSK Enc=ARIAGCM(128) Mac=AEAD
PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=PSK Au=PSK Enc=ARIAGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
ECDHE-ECDSA-AES256-SHA TLSv1 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA1
ECDHE-ECDSA-AES128-SHA TLSv1 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA1
RSA-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
DHE-PSK-AES256-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(256) Mac=AEAD
PSK-AES256-GCM-SHA384 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(256) Mac=AEAD
PSK-AES256-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
PSK-AES256-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(256) Mac=AEAD
RSA-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
DHE-PSK-AES128-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(128) Mac=AEAD
PSK-AES128-GCM-SHA256 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(128) Mac=AEAD
PSK-AES128-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
PSK-AES128-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(128) Mac=AEAD
ECDHE-PSK-AES256-CBC-SHA384 TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(256) Mac=SHA384
ECDHE-PSK-AES256-CBC-SHA TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(256) Mac=SHA1
SRP-DSS-AES-256-CBC-SHA SSLv3 Kx=SRP Au=DSS Enc=AES(256) Mac=SHA1
SRP-RSA-AES-256-CBC-SHA SSLv3 Kx=SRP Au=RSA Enc=AES(256) Mac=SHA1
SRP-AES-256-CBC-SHA SSLv3 Kx=SRP Au=SRP Enc=AES(256) Mac=SHA1
RSA-PSK-AES256-CBC-SHA384 TLSv1 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA384
DHE-PSK-AES256-CBC-SHA384 TLSv1 Kx=DHEPSK Au=PSK Enc=AES(256) Mac=SHA384
RSA-PSK-AES256-CBC-SHA SSLv3 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA1
DHE-PSK-AES256-CBC-SHA SSLv3 Kx=DHEPSK Au=PSK Enc=AES(256) Mac=SHA1
PSK-AES256-CBC-SHA384 TLSv1 Kx=PSK Au=PSK Enc=AES(256) Mac=SHA384
PSK-AES256-CBC-SHA SSLv3 Kx=PSK Au=PSK Enc=AES(256) Mac=SHA1
ECDHE-PSK-AES128-CBC-SHA256 TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(128) Mac=SHA256
ECDHE-PSK-AES128-CBC-SHA TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(128) Mac=SHA1
SRP-DSS-AES-128-CBC-SHA SSLv3 Kx=SRP Au=DSS Enc=AES(128) Mac=SHA1
SRP-RSA-AES-128-CBC-SHA SSLv3 Kx=SRP Au=RSA Enc=AES(128) Mac=SHA1
SRP-AES-128-CBC-SHA SSLv3 Kx=SRP Au0
Zyxel Employee
All Replies
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Hello @StefanZ
you can check the cipher by
Router(config)# show ip http server secure cipher-listThen you will see AES-128-CBC and AES-256-CBC
0 -
Thank you James.
The CLI output for the FLEX200 is:
TLS_AES_256_GCM_SHA384 TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any Au=any Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
DHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=DH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(128) Mac=AEADNo CBC to be found – so connecting those phones won't work I guess.
Or is there a way to activate/add CBC to the FLEX?0 -
Hello @StefanZ
The stronger ciphers are enabled by default. Please disable it first and check the cipher list again.
Router# configure terminal
Router(config)# no ip http secure-server strong-cipher
Router(config)# show ip http server secure cipher-listCurrent available cipher suites:
TLS_AES_256_GCM_SHA384 TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any Au=any Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-ECDSA-ARIA256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=ARIAGCM(256) Mac=AEAD
ECDHE-ARIA256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=ARIAGCM(256) Mac=AEAD
ECDHE-ECDSA-ARIA128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=ARIAGCM(128) Mac=AEAD
ECDHE-ARIA128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=ARIAGCM(128) Mac=AEAD
RSA-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=RSAPSK Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
DHE-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=DHEPSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-PSK-CHACHA20-POLY1305 TLSv1.2 Kx=ECDHEPSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
RSA-PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=RSAPSK Au=RSA Enc=ARIAGCM(256) Mac=AEAD
DHE-PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=DHEPSK Au=PSK Enc=ARIAGCM(256) Mac=AEAD
PSK-CHACHA20-POLY1305 TLSv1.2 Kx=PSK Au=PSK Enc=CHACHA20/POLY1305(256) Mac=AEAD
PSK-ARIA256-GCM-SHA384 TLSv1.2 Kx=PSK Au=PSK Enc=ARIAGCM(256) Mac=AEAD
RSA-PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=RSAPSK Au=RSA Enc=ARIAGCM(128) Mac=AEAD
DHE-PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=DHEPSK Au=PSK Enc=ARIAGCM(128) Mac=AEAD
PSK-ARIA128-GCM-SHA256 TLSv1.2 Kx=PSK Au=PSK Enc=ARIAGCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(256) Mac=AEAD
ECDHE-ECDSA-AES256-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM8 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM8(128) Mac=AEAD
ECDHE-ECDSA-AES128-CCM TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESCCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
ECDHE-ECDSA-AES256-SHA TLSv1 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA1
ECDHE-ECDSA-AES128-SHA TLSv1 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA1
RSA-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-GCM-SHA384 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(256) Mac=AEAD
DHE-PSK-AES256-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
DHE-PSK-AES256-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(256) Mac=AEAD
PSK-AES256-GCM-SHA384 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(256) Mac=AEAD
PSK-AES256-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(256) Mac=AEAD
PSK-AES256-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(256) Mac=AEAD
RSA-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=RSAPSK Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-GCM-SHA256 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESGCM(128) Mac=AEAD
DHE-PSK-AES128-CCM8 TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
DHE-PSK-AES128-CCM TLSv1.2 Kx=DHEPSK Au=PSK Enc=AESCCM(128) Mac=AEAD
PSK-AES128-GCM-SHA256 TLSv1.2 Kx=PSK Au=PSK Enc=AESGCM(128) Mac=AEAD
PSK-AES128-CCM8 TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM8(128) Mac=AEAD
PSK-AES128-CCM TLSv1.2 Kx=PSK Au=PSK Enc=AESCCM(128) Mac=AEAD
ECDHE-PSK-AES256-CBC-SHA384 TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(256) Mac=SHA384
ECDHE-PSK-AES256-CBC-SHA TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(256) Mac=SHA1
SRP-DSS-AES-256-CBC-SHA SSLv3 Kx=SRP Au=DSS Enc=AES(256) Mac=SHA1
SRP-RSA-AES-256-CBC-SHA SSLv3 Kx=SRP Au=RSA Enc=AES(256) Mac=SHA1
SRP-AES-256-CBC-SHA SSLv3 Kx=SRP Au=SRP Enc=AES(256) Mac=SHA1
RSA-PSK-AES256-CBC-SHA384 TLSv1 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA384
DHE-PSK-AES256-CBC-SHA384 TLSv1 Kx=DHEPSK Au=PSK Enc=AES(256) Mac=SHA384
RSA-PSK-AES256-CBC-SHA SSLv3 Kx=RSAPSK Au=RSA Enc=AES(256) Mac=SHA1
DHE-PSK-AES256-CBC-SHA SSLv3 Kx=DHEPSK Au=PSK Enc=AES(256) Mac=SHA1
PSK-AES256-CBC-SHA384 TLSv1 Kx=PSK Au=PSK Enc=AES(256) Mac=SHA384
PSK-AES256-CBC-SHA SSLv3 Kx=PSK Au=PSK Enc=AES(256) Mac=SHA1
ECDHE-PSK-AES128-CBC-SHA256 TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(128) Mac=SHA256
ECDHE-PSK-AES128-CBC-SHA TLSv1 Kx=ECDHEPSK Au=PSK Enc=AES(128) Mac=SHA1
SRP-DSS-AES-128-CBC-SHA SSLv3 Kx=SRP Au=DSS Enc=AES(128) Mac=SHA1
SRP-RSA-AES-128-CBC-SHA SSLv3 Kx=SRP Au=RSA Enc=AES(128) Mac=SHA1
SRP-AES-128-CBC-SHA SSLv3 Kx=SRP Au0 -
Router# configure terminal
Router(config)# no ip http secure-server strong-cipherThis worked. Thank you so much!
Now let's see if I get this phone connected…
0
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