we have a internet connection , but isp is using a GRE tunnelling . They have adjusted the mtu to 1492 and tcp adjust mss to 1452 . However some websites are not accessible , what could be reason , is it related to lower MTU than 1500 ?
2) as tcp retransmites dropped packets , we can concluded that is not related to bandwidht restrictions , i would apprecaite if some one from a Servcie provider background can give me a start to trouble shoot is issue
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Standard GRE headers use 24 bytes (not just 8). Try IP MTU 1476 and adjust-mss 1436. Also, if not enabled, activate PMTUD across the tunnel.
PPoE is generally 8 bytes. If you have a PPoE connection, decrement above by another 8 bytes.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.