can you paste the output of "show ip interface <interface>" from cisco and show interface <interface> from Juniper.
Regards, Amjad Ul Hasnain Qasmi -----Original Message----- From: cisco-nsp [mailto:[email protected]] On Behalf Of snort bsd Sent: Wednesday, December 18, 2013 6:03 AM To: juniper-nsp; cisco-nsp Subject: [c-nsp] ip fragmentation, different mtu sizes hi, all: i have a genetic question regarding ip fragmentation. i have two routers; one is cisco and another is juniper. they connected back to back with default ethernet mtu (cisco 1522 and juniper 1518, of course with vlan on both ends). i understand that two vendors have different ways of calculating the overhead of headers. when i send icmp pings, without specifying packets sizes (just default values) or specifying packet sizes smaller than the values (1472 on juniper side and 1500 on cisco side), everything is fine, but anything beyond thsoe two values on both ends, i got nothing. i thought that, for ip mtu, anything bigger than ip mtu (or juniper term protocol mtu) would be fragmented into multiple packets. did i miss something or my understanding isn't correct? thanks! _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
