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SRX Services Gateway

Speed on pp0 interface.

‎07-28-2014 06:18 PM

For the past month I have been trying to fin a reason for a slower speed on pp0 interface for the ADSL2+. Currently I have a Draytek Vigor 2760n (in bridged mode) connected to the SRX210. My subscription with Centurylink is 20mbps down. The problem I'm having is, the maximum down speed is only 13mbps. I've tried to adjust tcp-mss and noticed that with value of 1360 I get only 10mbps, and with tcp-mss value of 1450 I get 13mbps. With any higher value the SSL stops working correcty, and web pages don't load. When I use a Centurylink test modem setup in LLC-Bridge mode, the speed goes up to 18mbps. When the same Centurylink modem is configured as Pure Bridge, and the SRX210 does the pppoe, the speed drops to 10 to12mbps as well. Apparently, the issue seems to be with pp0 interface not allowing higher speeds over Ethernet port. I've considered to buy the ADSL2 mini-PIM to fix this use, but I am not sure if that would work either.

 

Is there any solution to this problem?

 

The pp0 configuration is bellow.

 

set interfaces ge-0/0/0 description ISP
set interfaces ge-0/0/0 unit 0 encapsulation ppp-over-ether
set interfaces pp0 unit 0 ppp-options chap default-chap-secret <...>
set interfaces pp0 unit 0 ppp-options chap local-name <...>
set interfaces pp0 unit 0 ppp-options chap passive
set interfaces pp0 unit 0 pppoe-options underlying-interface ge-0/0/0.0
set interfaces pp0 unit 0 pppoe-options idle-timeout 0
set interfaces pp0 unit 0 pppoe-options auto-reconnect 5
set interfaces pp0 unit 0 pppoe-options client
set interfaces pp0 unit 0 family inet mtu 1492
set interfaces pp0 unit 0 family inet negotiate-address
set routing-options static route 0.0.0.0/0 next-hop pp0.0
set security flow tcp-mss all-tcp mss 1450
set security zones security-zone untrust interfaces pp0.0


Thanks!

 

 

8 REPLIES 8
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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-01-2014 05:20 AM

Hello Wojo,,

MRU on pp0 would default to 1492.

Hence delete mtu statement under pp0 interface and set mss to 1452.

Check for the speeds now.

 

Regards,

c_r

Please Mark My Solution Accepted if
it Helped, Kudos are Appreciated too

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-03-2014 03:00 AM

c_r, thank you for the suggestion. Unfortunatelly, it did not work. Still getting 12 ~ 13mbps speed. I have noticed, when I run speedtest, the CPU goes to 100% utilization. I have verified the configuration on the device.

 

 

Aug  3 02:52:07  Router PERF_MON: RTPERF_CPU_THRESHOLD_EXCEEDED: FPC 0 PIC 0 CPU utilization exceeds threshold, current value=100

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-03-2014 07:00 PM

Hi this suggests that you have high PFE CPu

Need to investigate high CPU.


Regards,

c_r

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-04-2014 02:24 AM

I still think the problem is with pp0 interface, not able to process packets properly. I used to have cable modem connected to the Ethernet interface and had no problems with speed or CPU utilization.

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SRX Services Gateway

Re: Speed on pp0 interface.

[ Edited ]
‎08-04-2014 02:49 AM

Ok,which version are you in,did you try12.1X44D35?

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-04-2014 02:14 PM

Yes, this one: 12.1X44-D35.5

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-04-2014 06:25 PM

Hello Wojo,

 

I belive it would be a good idea to open a case with Juniper TAC.

 

Regards,
c_r

Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too

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SRX Services Gateway

Re: Speed on pp0 interface.

‎08-13-2015 09:22 AM

Hi WoJo,

 

I was wondering if you have sorted out your problem? I have similar issue when using SRX as PPPoE client.

 

when using SRX100 : download 5-6Mb , upload 17Mb

when using ASA5505 : download 62Mb , upload same as on SRX.

 

So it looks like it is something with PPPoE on SRX, but I think I have tried mosst options I thought about...