Error: ns3::Icmpv4DestinationUnreachable !!

[ac]

Hi,

I am getting following error (identified from traces) when data packet is
sent from source (with IP address 10.1.1.20) to destination( with IP
address 10.1.1.10)

t 101.641 /NodeList/9/DeviceList/0/$ns3::WifiNetDevice/Phy/State/Tx
ns3::WifiMacHeader (DATA ToDS=0, FromDS=0, MoreFrag=0, Retry=0, MoreData=0
Duration/ID=213us, DA=00:00:00:00:00:12, SA=00:00:00:00:00:0a,
BSSID=00:00:00:00:00:0a, FragNumber=0, SeqNumber=4) ns3::LlcSnapHeader
(type 0x800) ns3::Ipv4Header (tos 0x0 DSCP Default ECN Not-ECT ttl 64 id 0
protocol 1 offset (bytes) 0 flags [none] length: 56 10.1.1.10 > 10.1.1.20)
ns3::Icmpv4Header (type=3, code=3) ns3::Icmpv4DestinationUnreachable (tos
0x0 DSCP Default ECN Not-ECT ttl 59 id 0 protocol 17 offset (bytes) 0 flags
[none] length: 284 10.1.1.20 > 10.1.1.10 org data=192 1 0 9 1 8 0 0 )
ns3::WifiMacTrailer ()

I am not able to understand this behavior. The data packet is received by
node 9 as reflected in below entry

r 101.64 /NodeList/9/DeviceList/0/$ns3::WifiNetDevice/Phy/State/RxOk
ns3::WifiMacHeader (DATA ToDS=0, FromDS=0, MoreFrag=0, Retry=0, MoreData=0
Duration/ID=213us, DA=00:00:00:00:00:0a, SA=00:00:00:00:00:12,
BSSID=00:00:00:00:00:12, FragNumber=0, SeqNumber=15) ns3::LlcSnapHeader
(type 0x800) ns3::Ipv4Header (tos 0x0 DSCP Default ECN Not-ECT ttl 59 id 0
protocol 17 offset (bytes) 0 flags [none] length: 284 10.1.1.20 >
10.1.1.10) ns3::UdpHeader (length: 264 49153 > 9) Payload (size=256)
ns3::WifiMacTrailer ()

Can anyone suggest on this issue?

Thanks in advance!!!

AC