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
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