Don't ask me how I got this; ifconfig results from EPC running 729:
eth1 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:X errors:0 dropped:0 overruns:0 frame:0
TX packets:X errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:X (x.x GiB) TX bytes:X (x.x GiB)
Interrupt:77 Base address:0xc000
eth1.11 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:x.x.x.x Bcast:x.x.x.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1496 Metric:1
RX packets:X errors:0 dropped:0 overruns:0 frame:0
TX packets:X errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:X (x.x GiB) TX bytes:X (x.x GiB)
eth1.12 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:x.x.y.x Bcast:x.x.y.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1496 Metric:1
RX packets:X errors:0 dropped:0 overruns:0 frame:0
TX packets:X errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:X (x.x GiB) TX bytes:X (x.x GiB)
eth1.13 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
inet addr:a.b.c.d Bcast:a.b.c.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1496 Metric:1
RX packets:X errors:0 dropped:0 overruns:0 frame:0
TX packets:X errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:X (x.x GiB) TX bytes:X (x.x GiB)
VLAN 11 is bearer, VLAN 12 is management, VLAN 13 is PDN.
I could try increasing the MTU manually on the master interface and then on the
VLANs, outside of confd, but that would not persist across reboots of the EPC.
It would be an interesting experiment, however, just to see if the hardware (or
at least the current software/drivers) is capable of it.
We currently aren't pursuing full 1500 MTUs for LTE end-users (hasn't been a
problem to-date), so I haven't dug very far into this. I have just been
reading the threads here with interest and curiosity. However, given what I'm
seeing on ours, I don't see how, despite what we have seen posted here earlier,
it is at all currently possible to achieve 1500 MTU to end-user. Not simply
because the PDN VLAN is restricted to 1496 (which would make that the highest
MTU from end-user to internet possible), but also because the bearer VLAN is
stuck at 1496, which is a whopping 78 bytes short of the purported minimum 1574
MTU that is needed.
So: does anybody actually have this working? If not, why have we been told
that it is possible with the current software releases?
-- Nathan
From: [email protected] [mailto:[email protected]] On Behalf Of
Jeremy Austin
Sent: Tuesday, November 01, 2016 2:51 PM
To: [email protected]
Subject: Re: [Telrad] L3 MTU settings
On Sun, Oct 16, 2016 at 12:26 AM, J Portman
<[email protected]<mailto:[email protected]>> wrote:
Yup, but the EPC vlans are hard set to 1500 at the current time and no way to
change them. Beating my head against this wall right now.
Using the resources in this thread, I've tracked down a couple points of
interest.
ENBs running [4013, 4539, or 4573] return a full packet (ICMP+headers) of MTU
1900. (Payload 1900-28=1872) This is on either bearer or management VLANs.
EPC running 729, however, returns only 1496 (1468+headers). This is on several
PDNs, management, and bearer.
In all cases (Mikrotik routers, Netonix switches in some places) MTU size is
set to 1900 or higher.
On the EPC, netstat does not appear to show interface info (no -i flag), so I
can't tell what the MTU is purported to be.
Has anyone had success verifying and/or changing the EPC's MTU(s)?
--
Jeremy Austin
(907) 895-2311<tel:%28907%29%20895-2311>
(907) 803-5422<tel:%28907%29%20803-5422>
[email protected]<mailto:[email protected]>
Heritage NetWorks
Whitestone Power & Communications
Vertical Broadband, LLC
Schedule a meeting: http://doodle.com/jermudgeon
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