Accel-ppp does not work with all ADSL routes types

PPPoE related questions
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haniaro
Posts: 18
Joined: 29 Dec 2019, 14:18

Accel-ppp does not work with all ADSL routes types

Post by haniaro » 14 Nov 2020, 11:10

Our Accel-ppp LNS does not establish PPPoE connection with all ADSL routers types, for example:
DLink DSL-2740u
Netis DL4323, firmware version RTK v2.1.1

it return ProtoRej after auth_chap_md5 attempt.
We test all supported authentication protocols and got same result.

Attached two log files
Linksys working well
Netis does not work.

Thank you.
Attachments
accel-ppp.log.zip
(3.32 KiB) Downloaded 2 times

dimka88
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Joined: 13 Oct 2014, 05:51
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Re: Accel-ppp does not work with all ADSL routes types

Post by dimka88 » 15 Nov 2020, 17:29

Hello @haniaro, did you have auth_chap_md5 in [modules] section?
Maybe these routers want other types like MS-Chap V1 or V2

haniaro
Posts: 18
Joined: 29 Dec 2019, 14:18

Re: Accel-ppp does not work with all ADSL routes types

Post by haniaro » 18 Nov 2020, 06:29

Hello @dimka88,
Yes, I have auth_chap_md5 in [modules]
I did the test with all auth modules in [modules] section at same time, and each one alone, same result.
These types of routers connect to Cisco LNS normally.
I attached accel-ppp config file.

Thank you.
Attachments
accel-ppp.noip.zip
(863 Bytes) Downloaded 3 times

haniaro
Posts: 18
Joined: 29 Dec 2019, 14:18

Re: Accel-ppp does not work with all ADSL routes types

Post by haniaro » 21 Nov 2020, 11:44

Hello @dimka88
We noticed in tcpdump file that for working routers (eg: Linksys) there is PPP-CHAP challenge sent from Accel-PPP LNS to LAC and LAC response PPP-CHAP response,
But when try to connect from not working routers (eg: Netis), tcpdump showed only LAC response PPP-CHAP, not PPP-CHAP challenge

Dumps are attached.
Thank you.
Attachments
dump from LNS.zip
(10.94 KiB) Downloaded 1 time

dimka88
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Joined: 13 Oct 2014, 05:51
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Re: Accel-ppp does not work with all ADSL routes types

Post by dimka88 » 22 Nov 2020, 10:18

Hello @haniaro,
Do you have a chance to change auth on your Netis device to pap or chap_md5.
Maybe Cisco LAC doing something with authtypes?
Note: add to [modules] section the following params

Code: Select all

[modules]
auth_mschap_v2
auth_mschap_v1
auth_chap_md5
auth_pap

haniaro
Posts: 18
Joined: 29 Dec 2019, 14:18

Re: Accel-ppp does not work with all ADSL routes types

Post by haniaro » 26 Nov 2020, 07:08

Do you have a chance to change auth on your Netis device to pap or chap_md5.
Yes, I test with PAP and chap and auto: same result
Maybe Cisco LAC doing something with authtypes?
Netis working well with other LNS vendors, like Mikrotik, opensource L2TPNS
Note: add to [modules] section the following params
Same result.

tcpdump shows missing chap challenge sent from LNS to LAC/Router, even though there is chap response from LAC/Router to LNS.
also it shows missing configuration request from LAC/Router to LNS, normally LNS send configuration request (A) then LAC/Router send configuration request to LNS (B), then LNS ACK B, then LAC/Router ACK A, in case of Netis only A exist.

Thank you.

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