How to clear Don't Fragment (DF) bit

[root@ve10:Active] config  b db TM.PathMTUDiscovery TM.PathMTUDiscovery = enable [root@ve10:Active] config  tcpdump -nni 0.0 -s0 icmp -v tcpdump: listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes 20:17:08.139335 IP (tos 0x0, ttl 125, id 9480, offset 0, flags [none], proto: ICMP (1), length: 60) 192.168.206.33 > 172.28.19.252: ICMP echo request, id 1, seq 231, length 40 in slot1/tmm0 lis= 20:17:08.139355 IP (tos 0x0, ttl 255, id 552, offset 0, flags [DF], proto: ICMP (1), length: 60) 172.28.19.252 > 192.168.206.33: ICMP echo reply, id 1, seq 231, length 40 out slot1/tmm0 lis= [root@ve10:Active] config  b db TM.PathMTUDiscovery disable [root@ve10:Active] config  b db TM.PathMTUDiscovery TM.PathMTUDiscovery = disable [root@ve10:Active] config  tcpdump -nni 0.0 -s0 icmp -v tcpdump: listening on 0.0, link-type EN10MB (Ethernet), capture size 65535 bytes 20:17:44.423307 IP (tos 0x0, ttl 125, id 9576, offset 0, flags [none], proto: ICMP (1), length: 60) 192.168.206.33 > 172.28.19.252: ICMP echo request, id 1, seq 234, length 40 in slot1/tmm0 lis= 20:17:44.423336 IP (tos 0x0, ttl 255, id 572, offset 0, flags [none], proto: ICMP (1), length: 60) 172.28.19.252 > 192.168.206.33: ICMP echo reply, id 1, seq 234, length 40 out slot1/tmm0 lis= 

Thank you. So it's a way to clear DF bit in reply packet. But I've something on my mind.

Is disable PMTUD affect another traffic? because for all i know this problem affect only one virtual server and only icmp traffic.