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Packet Discard Rules
For all supported types of traffic (TCP, UDP, ICMP,
and GRE), NAT discards packets in the following cases:
- When the translation table is full (that is, no more entries
can be added).
- When the address pool is exhausted for outbound packets
with inside source dynamic translation.
- When no match can be found for the destination addresses
of inbound packets.
- When the address pool is exhausted for inbound packets
with outside source dynamic translation.
In addition, NAT discards GRE packets under the
following conditions:
- When the GRE packets match an NAPT rule.
- When Firewall is functioning.
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