MTU settings

[#1]

Quote from: AndyH

@ chrcoluk - Is your ppp0 definitely using a 1500 MTU? I'm on pcl-ag05 and it's failing (testing from the router also now). Also, is anyone else on one of the BNGs at the moment?

I defenitly have a 1500 mtu as I tested right after I did the post.
Remember I notice very easily if issues as youtube crawls along (which I use daily).
I believe not all pcl's are the same, I know some fail, I just couldnt remember which, although I did in one of my posts said which gateway failed last time in the ipv6 section.

[#2]

Superzoom I use 1500 on my client machine. Also posted a screenshot from speedguide.net to show its on my client machine.

C:\Windows\system32>ping -l 1472 -f bbc.co.uk
Pinging bbc.co.uk [212.58.244.18] with 1472 bytes of data:
Reply from 212.58.244.18: bytes=1472 time=15ms TTL=54
Reply from 212.58.244.18: bytes=1472 time=16ms TTL=54
Reply from 212.58.244.18: bytes=1472 time=15ms TTL=54
Reply from 212.58.244.18: bytes=1472 time=15ms TTL=54
Ping statistics for 212.58.244.18:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 15ms, Maximum = 16ms, Average = 15ms

[#3]

This is with MTU set at 1500 in the router settings.

Quote

Firewall off C:\Users\room>ping -l 1472 -f bbc.co.uk Pinging bbc.co.uk [212.58.244.18] with 1472 bytes of data: Reply from 212.58.244.18: bytes=1472 time=28ms TTL=54 Reply from 212.58.244.18: bytes=1472 time=28ms TTL=54 Reply from 212.58.244.18: bytes=1472 time=28ms TTL=54 Reply from 212.58.244.18: bytes=1472 time=28ms TTL=54 Ping statistics for 212.58.244.18:    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds:    Minimum = 28ms, Maximum = 28ms, Average = 28ms Firewall on C:\Users\room>ping -l 1472 -f bbc.co.uk Pinging bbc.co.uk [212.58.246.103] with 1472 bytes of data: Reply from 212.58.246.103: bytes=1472 time=26ms TTL=54 Reply from 212.58.246.103: bytes=1472 time=26ms TTL=54 Reply from 212.58.246.103: bytes=1472 time=26ms TTL=54 Reply from 212.58.246.103: bytes=1472 time=26ms TTL=54 Ping statistics for 212.58.246.103:    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds:    Minimum = 26ms, Maximum = 26ms, Average = 26ms

No MTU value set in the ping
Pinging bbc.co.uk [212.58.246.104] with 32 bytes of data:
Reply from 212.58.246.104: bytes=32 time=12ms TTL=54
Reply from 212.58.246.104: bytes=32 time=13ms TTL=54
Reply from 212.58.246.104: bytes=32 time=13ms TTL=54
Reply from 212.58.246.104: bytes=32 time=12ms TTL=54
Ping statistics for 212.58.246.104:
   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
   Minimum = 12ms, Maximum = 13ms, Average = 12ms

[#4]

are you using the -f flag?

[#5]

EdgeOS 1.5B1

Thu May 15 19:31:41 UTC 2014: User ubnt starting PPP daemon for pppoe0 by connect command
Connected to a0:f3:e4:35:55:7e via interface eth2
using channel 3
Using interface ppp0
Connect: ppp0 <--> eth2
sent [LCP ConfReq id=0x1 <magic 0x3204f1fa>]
rcvd [LCP ConfReq id=0xba <mru 1500> <auth chap MD5> <magic 0x1378a7dc>]
lcp_reqci: returning CONFACK.
sent [LCP ConfAck id=0xba <mru 1500> <auth chap MD5> <magic 0x1378a7dc>]
rcvd [LCP ConfAck id=0x1 <magic 0x3204f1fa>]
sent [LCP EchoReq id=0x0 magic=0x3204f1fa]
rcvd [CHAP Challenge id=0x1 <removed>, name = "removed"]
sent [CHAP Response id=0x1 <removed>, name = "username"]
rcvd [LCP EchoRep id=0x0 magic=0x1378a7dc]
sent [LCP EchoReq id=0x1 magic=0x3204f1fa]
rcvd [LCP EchoRep id=0x1 magic=0x1378a7dc]
rcvd [LCP ConfReq id=0x28 <mru 32725> <auth chap MD5> <magic 0x49ec1655>]
sent [LCP ConfReq id=0x2 <magic 0xe3efbf9a>]
lcp_reqci: returning CONFACK.
sent [LCP ConfAck id=0x28 <mru 32725> <auth chap MD5> <magic 0x49ec1655>]
rcvd [LCP ConfAck id=0x2 <magic 0xe3efbf9a>]
Couldn't increase MTU to 32725
sent [LCP EchoReq id=0x0 magic=0xe3efbf9a]
rcvd [CHAP Challenge id=0x27 <removed>, name = "PCL-AG07"]
sent [CHAP Response id=0x27 <removed>, name = "removed"]
rcvd [LCP EchoRep id=0x0 magic=0x49ec1655]
rcvd [CHAP Success id=0x27 ""]
CHAP authentication succeeded
CHAP authentication succeeded
peer from calling number A0:F3:E4:35:55:7E authorized
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfReq id=0xec <addr 195.166.128.188>]
ipcp: returning Configure-ACK
sent [IPCP ConfAck id=0xec <addr 195.166.128.188>]
rcvd [IPCP ConfNak id=0x1 <addr 212.xxx.xxx.xxx> <ms-dns1 212.159.6.9> <ms-dns3 212.159.6.10>]
sent [IPCP ConfReq id=0x2 <addr 212.xxx.xxx.xxx> <ms-dns1 212.159.6.9> <ms-dns3 212.159.6.10>]
rcvd [IPCP ConfAck id=0x2 <addr 212.xxx.xxx.xxx> <ms-dns1 212.159.6.9> <ms-dns3 212.159.6.10>]
ipcp: up
Script /etc/ppp/ip-pre-up started (pid 7698)
Script /etc/ppp/ip-pre-up finished (pid 7698), status = 0x0
local  IP address 212.xxx.xxx.xxx
remote IP address 195.166.128.188
primary   DNS address 212.159.6.9
secondary DNS address 212.159.6.10
Script /etc/ppp/ip-up started (pid 7749)
Script /etc/ppp/ip-up finished (pid 7749), status = 0x0

root@fbdn-home# show interfaces ethernet eth2 mtu
 mtu 1508

root@fbdn-home# show interfaces ethernet eth2 pppoe 0
 default-route auto
 firewall {
     in {
         name Internet
     }
     local {
         name Internet_to_edgemax
     }
 }
 mtu 1500
 name-server auto
 password mypass
 user-id myuser

Edit: Ping data

root@fbdn-home# ping -s 1472 -M do  8.8.8.8
PING 8.8.8.8 (8.8.8.8) 1472(1500) bytes of data.
1480 bytes from 8.8.8.8: icmp_req=1 ttl=55 time=11.4 ms
1480 bytes from 8.8.8.8: icmp_req=2 ttl=55 time=11.4 ms
1480 bytes from 8.8.8.8: icmp_req=3 ttl=55 time=11.2 ms
1480 bytes from 8.8.8.8: icmp_req=4 ttl=55 time=11.2 ms
1480 bytes from 8.8.8.8: icmp_req=5 ttl=55 time=11.5 ms
1480 bytes from 8.8.8.8: icmp_req=6 ttl=55 time=11.3 ms
^C
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5006ms
rtt min/avg/max/mdev = 11.227/11.389/11.512/0.129 ms

[#6]

@ dragon2611 - I take it you have no issues using  a 1500 MTU? wget http://platform.twitter.com/widgets/tweet_button.1400006231.html works ok?

[#7]

Quote from: chrcoluk

are you using the -f flag?

Yes mate, amended above.

[#8]

Quote from: AndyH

@ dragon2611 - I take it you have no issues using  a 1500 MTU? wget http://platform.twitter.com/widgets/tweet_button.1400006231.html works ok?

Did have to think for a moment what I had on the network that was currently running and had wget installed.  

pi@raspberrypi ~ $ wget http://platform.twitter.com/widgets/tweet_button.1400006231.html
--2014-05-15 20:58:39--  http://platform.twitter.com/widgets/tweet_button.1400006231.html
Resolving platform.twitter.com (platform.twitter.com)... 199.96.57.6
Connecting to platform.twitter.com (platform.twitter.com)|199.96.57.6|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 69347 (68K) [text/html]
Saving to: `tweet_button.1400006231.html.1'
100%[===================================================>] 69,347      --.-K/s   in 0.02s
2014-05-15 20:58:40 (2.67 MB/s) - `tweet_button.1400006231.html.1' saved [69347/69347]

Edit: Tried again after resizing SSH window so that the text actually fits on screen 

[#9]

Quote from: PitchBlack

Quote from: chrcoluk are you using the -f flag? Yes mate, amended above.

never seen your issue, thats bizarre, it suggests your router is not handling it properly.

[#10]

All looking pretty good, then: PitchBlack doesn't have an MTU problem, and dragon2611 doesn't either (for different reasons) 
I want to join this exclusive club!!!

[#11]

I've tried a new Asus beta firmware and the problem seems to have gone away. No issues so far loading any sites with a MTU of 1500.
They want to do some remote diagnostics to find out the cause.

[#12]

Andy there is a few unpatched ipv6 bugs in the asus firmware, merlin has patched them in his builds.

[#13]

yeah, there are quite a few bugs (also in Merlin's builds also) - Asus told me the AC models have updates now and I think Merlin will have updated his firmware also today or tomorrow. RT-N66U should be updated next week.

[#14]

Just as a side question,
I was waiting for fibre to come to my area before I bought a new router,  I then saw that fibre was coming in November of last year, I had decided on the ASUS N66U. I then found out that BT were not going to upgrade my cabinet so I didn't buy a new router as I didn't want to buy a new one for my ADSL 2+ then have to buy another one if they decided to upgrade my cab to fibre in the near future.
My question is: is there a router that I could buy now and use with my ADSL 2+ connection and which will also work with fibre if they decide to upgrade my cab.

[#15]

asus n66u will work with both as it doesnt have an integrated modem, you connect the modem to the WAN port (whether its a adsl or vdsl modem).