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Napsterbater
Meh
Premium,MVM
join:2002-12-28
Milledgeville, GA
Reviews:
·Windstream

1 edit

1 recommendation

[Info] 1500 MTU on PPPoE on a ATM DSL Interface (I.e. DSL Modem)

This is a bit random and some may know about this command but figured id share incase someone didn't.

I have always used PPPoA with my DSL provider so i could get a 1500 MTU, well in their upgrades PPPoA no longer works so I was forced back to PPPoE with a 1492 MTU.

I just stumbled upon a setting in my 887 called "pppoe-client ppp-max-payload" and setting this on the PVC with the "pppoe-client dial-pool-number" can allow an MTU of 1500 if the BRAS of you ISP supports it and (i think) they are running a higher MTU on the ethernet network between you and the BRAS.

Without "pppoe-client ppp-max-payload 1500"

C:\Users\Napsterbater>ping -f -l 1472 -4 napshome.net
 
Pinging napshome.net [199.233.234.10] with 1472 bytes of data:
Reply from 10.0.1.3: Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
 
Ping statistics for 199.233.234.10:
    Packets: Sent = 3, Received = 1, Lost = 2 (66% loss),
Control-C
^C
C:\Users\Napsterbater>ping -f -l 1464 -4 napshome.net
 
Pinging napshome.net [199.233.234.10] with 1464 bytes of data:
Reply from 199.233.234.10: bytes=1464 time=100ms TTL=115
 

car1#show interface dialer0
Dialer0 is up, line protocol is up (spoofing)
  Hardware is Unknown
  Internet address is 75.117.179.233/32
  MTU 1492 bytes, BW 56 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 68/255
  Encapsulation PPP, LCP Closed, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Interface is bound to Vi2
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 00:27:52
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 42 kilobits/sec
  5 minute input rate 15000 bits/sec, 4 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     18479 packets input, 8541068 bytes
     20852 packets output, 4694629 bytes
Bound to:
Virtual-Access2 is up, line protocol is up
  Hardware is Virtual Access interface
  MTU 1492 bytes, BW 700 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Open
  Stopped: IPV6CP, CDPCP
  Open: IPCP
  PPPoE vaccess, cloned from Dialer0
  Vaccess status 0x44, loopback not set
  Keepalive set (10 sec)
  Interface is bound to Di0 (Encapsulation PPP)
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 00:00:28
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1000 bits/sec, 1 packets/sec
  5 minute output rate 2000 bits/sec, 1 packets/sec
     131 packets input, 30956 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     150 packets output, 44707 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
 

pppoe-client ppp-max-payload 1500 (Gives you an MTU of 1500)

With pppoe-client ppp-max-payload 1500

C:\Users\Napsterbater>ping -f -l 1472 -4 napshome.net
 
Pinging napshome.net [199.233.234.10] with 1472 bytes of data:
Reply from 199.233.234.10: bytes=1472 time=112ms TTL=115
Reply from 199.233.234.10: bytes=1472 time=104ms TTL=115
 
Ping statistics for 199.233.234.10:
    Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 104ms, Maximum = 112ms, Average = 108ms
 

car1#show interface dialer0
Dialer0 is up, line protocol is up (spoofing)
  Hardware is Unknown
  Internet address is 71.30.44.225/32
  MTU 1500 bytes, BW 56 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 9/255, rxload 68/255
  Encapsulation PPP, LCP Closed, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Interface is bound to Vi2
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 00:36:16
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 42 kilobits/sec
  5 minute input rate 15000 bits/sec, 10 packets/sec
  5 minute output rate 2000 bits/sec, 2 packets/sec
     26848 packets input, 10505856 bytes
     31022 packets output, 6579980 bytes
Bound to:
Virtual-Access2 is up, line protocol is up
  Hardware is Virtual Access interface
  MTU 1500 bytes, BW 700 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 6/255, rxload 5/255
  Encapsulation PPP, LCP Open
  Stopped: IPV6CP, CDPCP
  Open: IPCP
  PPPoE vaccess, cloned from Dialer0
  Vaccess status 0x44, loopback not set
  Keepalive set (10 sec)
  Interface is bound to Di0 (Encapsulation PPP)
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 00:07:28
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 15000 bits/sec, 11 packets/sec
  5 minute output rate 18000 bits/sec, 14 packets/sec
     7440 packets input, 1765084 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     9092 packets output, 1677331 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
 

EDIT: pasted to wrong command, a few time lol, correct command is "pppoe-client ppp-max-payload 1500" not "pppoe-client dial-pool-number" although they are used together.

--
ASUS M4A79T Deluxe | AMD Phenom II x3 720 BE AM3 w/4 Cores @ 3.41Ghz(OC) | 8GB DDR3 Memory @ 1600mhz | Sapphire ATI HD4870 1GB 800mhz/1000mhz(OC) | 2x500GB HDD's Raid 0 | Windows 7 Ultimate x64| Windstream DSL 12m (14.9m Sync)/766k


TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

Re: [Info] 1500 MTU on PPPoE on a ATM DSL Interface (I.e. DSL Mo

Cool.

Thanks for pointing this out. Lets hope more and more ISPs turn it on in their networks.

Im going to ask my former ISP who I used to work for if they support it.



Napsterbater
Meh
Premium,MVM
join:2002-12-28
Milledgeville, GA
Reviews:
·Windstream

said by TomS_:

Cool.

Thanks for pointing this out. Lets hope more and more ISPs turn it on in their networks.

Im going to ask my former ISP who I used to work for if they support it.

I didn't even ask , I just tried it. I doubt i would have been able to talk to anyone that knows anything about it anyways.
--
ASUS M4A79T Deluxe | AMD Phenom II x3 720 BE AM3 w/4 Cores @ 3.41Ghz(OC) | 8GB DDR3 Memory @ 1600mhz | Sapphire ATI HD4870 1GB 800mhz/1000mhz(OC) | 2x500GB HDD's Raid 0 | Windows 7 Ultimate x64| Windstream DSL 12m (14.9m Sync)/766k


TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

My previous employer is usually considered one of the more technically inclined ISPs in Australia. So this is something that should be up their alley.



Napsterbater
Meh
Premium,MVM
join:2002-12-28
Milledgeville, GA

Nice, being in the US, we don't generally have the luxury heh.



TomS_
Git-r-done
Premium,MVM
join:2002-07-19
London, UK
kudos:5

You just have to stay away from the mainstream ISPs. They tend to cater more for the common denominator.

There are more specialised ISPs that cater for the enthusiasts and are the ones likely to play with features like these.



Napsterbater
Meh
Premium,MVM
join:2002-12-28
Milledgeville, GA
Reviews:
·Windstream

Have you not looked at this site lol... most of us have only 1 option, excluding Dialup and Satellite.

I'm lucky in that a cable provider just deployed a new section of their HFC Cable network to my area and Ill be able to drop Windsuck DSL soon.
--
ASUS M4A79T Deluxe | AMD Phenom II x3 720 BE AM3 w/4 Cores @ 3.41Ghz(OC) | 8GB DDR3 Memory @ 1600mhz | Sapphire ATI HD4870 1GB 800mhz/1000mhz(OC) | 2x500GB HDD's Raid 0 | Windows 7 Ultimate x64| Windstream DSL 12m (14.9m Sync)/766k