Hello Expert,
I am seeing a weird issue where ISR1100-4G running 17.6.3 is changing the identifier field of ICMP packet.
If I send 30 ICMP packet to WAN interface of the router, it randomly changes identifier field of 2-3 packet in non-patter manner. Attach is the complete packet trace file.
GGKDR-ROU-INET01#ping 36.95.232.45 so lo0 rep 50
Type escape sequence to abort.
Sending 50, 100-byte ICMP Echos to 36.95.232.45, timeout is 2 seconds:
Packet sent with a source address of 103.41.209.254
!!.!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 96 percent (48/50), round-trip min/avg/max = 7/8/9 ms
GGKDR-ROU-INET01#
==Packet trace on 36.95.232.45=====
MPGG-LMG-SDWAN-01#show platform packet-trace packet 8 decode
Packet: 8 CBUG ID: 1058
Summary
Input : INJ.9
Output : GigabitEthernet0/0/1
State : FWD
Timestamp
Start : 1726524138946080 ns (10/12/2022 07:26:14.345925 UTC)
Stop : 1726524138969372 ns (10/12/2022 07:26:14.345948 UTC)
Path Trace
Feature: IPV4(Input)
Input : internal0/0/recycle:0
Output : <unknown>
Source : 36.95.232.45
Destination : 103.41.209.254
Protocol : 1 (ICMP)
Feature: DEBUG_COND_INPUT_PKT_EXT
Entry : Input - 0x8157e550
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 690 ns
Feature: DEBUG_COND_APPLICATION_IN_EXT
Entry : Input - 0x8157e540
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 618 ns
Feature: DEBUG_COND_APPLICATION_IN_CLR_TXT_EXT
Entry : Input - 0x8157e53c
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 385 ns
Feature: IPV4_INTERNAL_DST_LOOKUP_CONSUME_EXT
Entry : Input - 0x815ab08c
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 1345 ns
Feature: IPV4_INTERNAL_INPUT_SRC_LOOKUP_ISSUE_EXT
Entry : Input - 0x815ab098
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 560 ns
Feature: IPV4_INTERNAL_INPUT_SRC_LOOKUP_CONSUME_EXT
Entry : Input - 0x815ab094
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 581 ns
Feature: LFTS_INJECT_PKT_EXT
Entry : Input - 0x8157f51c
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 596 ns
Feature: IPV4_INTERNAL_FOR_US_EXT
Entry : Input - 0x815ab090
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 1141 ns
Feature: IPV4_PREF_TX_IF_SELECT_EXT
Entry : Input - 0x815ab0b8
Input : internal0/0/recycle:0
Output : <unknown>
Lapsed time : 807 ns
Feature: IPV4_INPUT_LOOKUP_PROCESS_EXT
Entry : Input - 0x815ab080
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 2458 ns
Feature: UPDATE_ICMP_PKT_EXT
Entry : Input - 0x815aa514
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1105 ns
Feature: INTERNAL_INPUT_GOTO_OUTPUT_FEATURE_EXT
Entry : Input - 0x81581f74
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 3476 ns
Feature: CBUG_OUTPUT_FIA_EXT
Entry : Output - 0x8157e538
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1032 ns
Feature: IPV4_OUTPUT_VFR_EXT
Entry : Output - 0x815abfa8
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 930 ns
Feature: IPV4_NAT_OUTPUT_FIA_EXT
Entry : Output - 0x815b5e0c
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 84225 ns
Feature: IPV4_OUTPUT_THREAT_DEFENSE_EXT
Entry : Output - 0x815bd3a8
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1687 ns
Feature: IPV4_VFR_REFRAG_EXT
Entry : Output - 0x815abfac
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 792 ns
Feature: DEBUG_COND_APPLICATION_OUT_CLR_TXT_EXT
Entry : Output - 0x8157e544
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 574 ns
Feature: IPV4_OUTPUT_L2_REWRITE_EXT
Entry : Output - 0x814191f8
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 2683 ns
Feature: DEBUG_COND_MAC_EGRESS_EXT
Entry : Output - 0x8157e558
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1083 ns
Feature: DEBUG_COND_APPLICATION_OUT_EXT
Entry : Output - 0x8157e548
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 487 ns
Feature: IPV4_OUTPUT_FRAG_EXT
Entry : Output - 0x815aaf48
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 945 ns
Feature: IPV4_OUTPUT_DROP_POLICY_EXT
Entry : Output - 0x815b934c
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 2669 ns
Feature: IPV4_OUTPUT_SDWAN_FNF_FINAL_EXT
Entry : Output - 0x8158edc4
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1098 ns
Feature: DEBUG_COND_OUTPUT_PKT_EXT
Entry : Output - 0x8157e55c
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 1323 ns
Feature: MARMOT_SPA_D_TRANSMIT_PKT_EXT
Entry : Output - 0x815c6138
Input : internal0/0/recycle:0
Output : GigabitEthernet0/0/1
Lapsed time : 18363 ns
Packet Copy In
45000064 af3b0000 ff01c6a8 245fe82d 6729d1fe 0000253b 01b50002 00000006
12014d51 abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd
abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd
abcdabcd
IPv4
Version : 4
Header Length : 5
ToS : 0x00
Total Length : 100
Identifier : 0xaf3b
IP Flags : 0x0
Frag Offset : 0
TTL : 255
Protocol : 1 (ICMP)
Header Checksum : 0xc6a8
Source Address : 36.95.232.45
Destination Address : 103.41.209.254
ICMP
Type : 0 (Echo Reply)
Code : 0 (No Code)
Checksum : 0x253b
Identifier : 0x01b5 <<=======<<
Sequence : 0x0002
Packet Copy Out
485702f5 1a263c51 0e021312 08004500 0064af3b 0000ff01 c6a8245f e82d6729
d1fe0000 255001a0 00020000 00061201 4d51abcd abcdabcd abcdabcd abcdabcd
abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd abcdabcd
abcdabcd abcdabcd abcdabcd abcdabcd abcd
ARPA
Destination MAC : 4857.02f5.1a26
Source MAC : 3c51.0e02.1312
Type : 0x0800 (IPV4)
IPv4
Version : 4
Header Length : 5
ToS : 0x00
Total Length : 100
Identifier : 0xaf3b
IP Flags : 0x0
Frag Offset : 0
TTL : 255
Protocol : 1 (ICMP)
Header Checksum : 0xc6a8
Source Address : 36.95.232.45
Destination Address : 103.41.209.254
ICMP
Type : 0 (Echo Reply)
Code : 0 (No Code)
Checksum : 0x2550
Identifier : 0x01a0 <<===<<
Sequence : 0x0002
