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 Can I set the TCP MSS anywhere? Regards Michael Knill
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