Hi All,
i have a stituation which i needed help in explain on this situation.i have 2 routers and i have configure 2 serial links on each router into a ppp multilink 1, when i ping both ways from both router i need to ping with 1 byte lesser then the mtu size i set. As show below
routerA#ping 202.122.151.129 df si 1604
Type escape sequence to abort.
Sending 5, 1604-byte ICMP Echos to 202.122.151.129, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/12/12 ms
routerA#ping 202.122.151.129 df si 1605
Type escape sequence to abort.
Sending 5, 1605-byte ICMP Echos to 202.122.151.129, timeout is 2 seconds:
Packet sent with the DF bit set
.....
Success rate is 0 percent (0/5)
routerA#sh run int multil 1
Building configuration...
Current configuration : 384 bytes
!
interface Multilink1
mtu 1605
ip address 202.122.151.130 255.255.255.252
load-interval 30
ppp multilink
ppp multilink group 1
end
routerA#
============================================
routerB#ping 202.122.151.130 df si 1604
Type escape sequence to abort.
Sending 5, 1604-byte ICMP Echos to 202.122.151.130, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/12 ms
routerB#ping 202.122.151.130 df si 1605
Type escape sequence to abort.
Sending 5, 1605-byte ICMP Echos to 202.122.151.130, timeout is 2 seconds:
Packet sent with the DF bit set
.....
Success rate is 0 percent (0/5)
routerB#
routerB#
routerB#sh run int multil 1
Building configuration...
Current configuration : 380 bytes
!
interface Multilink1
mtu 1605
ip address 202.122.151.129 255.255.255.252
load-interval 30
ppp multilink
multilink-group 1
end
Can some one explain to me why i have to ping with 1 byte lesser then mtu set on ppp multilink ??
Thanks
