[K12OSN] OT: Connecting Firewall to DSL/PPPoE device via VLAN

Burroughs, Henry HBurroughs at HHPREP.ORG
Mon Jul 30 16:22:05 UTC 2007

I've got a new G.SHDSL  connection.  I let them install it at the
demarcation point for the phones and then connected it via VLAN across
my network to my firewall.  I've got a few "issues"  that seem to be
happening... it seems to be a MTU issue.  I've currently got 1500 MTU on
the ethernet (eth1) on the firewall that is used to connect via PPPoE.
The ppp0 connection (does not have a set default MTU via ADSL client
config in Webmin).  If I put a 1492 MTU limit on the ppp0 connection, it
can't authenticate.  Any suggestions?  I can't download ISO images from
K12LTSP, some users's can't log into hotmail... and pings of higher data
values (ping -s 1472 www.dslreports.com <http://www.dslreports.com/> )
actually get lost.



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