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Re: [Astlinux-users] MTU/MSS Problem with new carrier internet services
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From: Lonnie A. <li...@lo...> - 2020-06-26 02:40:19
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Or in the same /tmp/etc/ppp/pppoe.conf file add: -- MTU=1452 MRU=1452 -- and leave PPPD_EXTRA alone. Lonnie > On Jun 25, 2020, at 9:19 PM, Lonnie Abelbeck <li...@lo...> wrote: > > Hi Michael, > > Looking at the code, to make the MTU stick would require some script changes, but you could test... > > After boot edit /tmp/etc/ppp/pppoe.conf > > You should see something like: > > PPPD_EXTRA="persist maxfail 0" > > You should be able to add pppd options to that, something like: > > PPPD_EXTRA="persist maxfail 0 mtu 1452 mru 1452" > > (Or try 1460) > > Then restart PPPoE. > > (Note 1452 is 1412+40) > > If that works we could add a rc.conf variable to add the mtu/mru options. > > Lonnie > > > > >> On Jun 25, 2020, at 8:56 PM, Michael Knill <mic...@ip...> wrote: >> >> Thanks Lonnie >> >> Hmm MSS should be fine then assuming it is working. >> I will do some more testing on the new service in my home office. Unfortunately the one not working is a building site and its way too cold at the moment. >> >> Regards >> Michael Knill >> >> On 26/6/20, 11:45 am, "Lonnie Abelbeck" <li...@lo...> wrote: >> >> >> >>> On Jun 25, 2020, at 8:05 PM, Michael Knill <mic...@ip...> wrote: >>> >>> Hi Group >>> >>> I have changed my internet provider and I am having connectivity problems to some sites on Astlinux. >>> I am fairly certain that it is an MTU/MSS issue as I have fixed it on my Mikrotik router by adjusting this value. >>> Funny that I'm having problems with this provider but not on my previous provider. Both are using PPPoE and I tested that the maximum MTU for both is 1464 e.g. >>> >>> 3035-JSainsbury-CM1 kd # fping -M -b 1465 12000.ipcaccess.net >>> 12000.ipcaccess.net: error while sending ping: Message too long >>> 3035-JSainsbury-CM1 kd # fping -M -b 1464 12000.ipcaccess.net >>> 12000.ipcaccess.net is alive >>> >>> 3076-VisionCF-CM1 kd # fping -M -b 1465 12000.ipcaccess.net >>> 12000.ipcaccess.net: error while sending ping: Message too long >>> 3076-VisionCF-CM1 kd # fping -M -b 1464 12000.ipcaccess.net >>> 12000.ipcaccess.net is alive >>> >>> Maybe my new provider is not allowing fragmentation? >>> >>> Anyway just wondering how I fix this problem. Do I just set MTU using IFMTU in user.conf? E.g. >>> IFMTU=ppp0:1460 >> >> No, per the /stat/etc/rc.conf file: >> -- >> ## MTU Changes >> ## If you need to specifically set the MTU for a given interface, do that here. >> ## You can try to set the MTU for any valid type of interface. With ethernet it >> ## works most of the time. Everything else, caveat emptor... >> ## If you are using PPPoE don't worry. We automatically handle those MTU issues >> #IFMTU="eth2.41:1496 eth0:1492" >> -- >> >> I don't see any configuration for the PPPoE MTU, though there may be a way. >> >> What is the local MTU set to by default ? >> -- >> ip link show dev ppp0 >> -- >> >> After the PPPoE link is up you could try to change it: >> -- >> ip link set dev ppp0 mtu 1460 >> -- >> >> If that works we can try to figure out how to make that stick. >> >> >>> Can I set the TCP MSS anywhere? >> >> This is the current value hardcoded in the PPPoE config: >> >> CLAMPMSS=1412 >> -- PPPoE docs -- >> CLAMPMSS >> The value at which to "clamp" the advertised MSS for TCP sessions. The default of 1412 should be fine. >> -- >> >> Lonnie >> >> >> >> >> >>> >>> Regards >>> Michael Knill >>> _______________________________________________ >>> Astlinux-users mailing list >>> Ast...@li... >>> https://lists.sourceforge.net/lists/listinfo/astlinux-users >>> >>> Donations to support AstLinux are graciously accepted via PayPal to pa...@kr.... >> >> >> >> _______________________________________________ >> Astlinux-users mailing list >> Ast...@li... >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> >> Donations to support AstLinux are graciously accepted via PayPal to pa...@kr.... >> >> >> _______________________________________________ >> Astlinux-users mailing list >> Ast...@li... >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> >> Donations to support AstLinux are graciously accepted via PayPal to pa...@kr.... > > > > _______________________________________________ > Astlinux-users mailing list > Ast...@li... > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to pa...@kr.... |
