Am 26.12.2025 um 10:52:48 Uhr schrieb Tom Beecher: > Packet comes in with DF set. Egress interface MTU is too small. ICMP > Frag Needed generated, source address is RFC1918 loopback from the > router control plane. On the return trip, packet crosses network that > (correctly) drops all RFC1918 sourced traffic.
Can't you use NAT (the Cisco ISR devices support nat inside on lo too IIRC) or configure the source address for outgoing router traffic? > This is not a routing problem at all. This is very common. Indeed, but a filtering problem if routers on the path filter non-public address ranges. -- Gruß Marco Send unsolicited bulk mail to [email protected]
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