[j-nsp] ip fragmentation, different mtu sizes

[Phil Fagan]

Are you trying to transit >1500 or terminate > 1500? You should be able to
pass and fragment. But maybe the mgmt plane won't frag if your trying the
interface itself.
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!
_______________________________________________
juniper-nsp mailing list juniper-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp