Package realtek-re-kmod198 for pfSense 2.8.0 (amd64)
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I got same issue while using the default deployment upgrade pack. found the realtek default installed driver causing problem on IPv6 traffic RXCSUM_IPV6. This flag cannot remove
re0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
description: WAN
options=20201b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,WOL_MAGIC,RXCSUM_IPV6>
ether 00:e0:4c:17:57:1f
inet 122.57.217.218 netmask 0xfffff800 broadcast 122.57.223.255
inet6 fe80::2e0:4cff:fe17:571f%re0 prefixlen 64 scopeid 0x1
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
re1: flags=1008943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
description: LAN
options=20201b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,WOL_MAGIC,RXCSUM_IPV6>Finally I have download the driver and overwrite the current one
https://pkg01-atx.netgate.com/packages/pfSense_master_amd64-pfSense_devel/All/realtek-re-kmod-1100.00.1500030_1.pkg
after this action. the re0,re1 has checksum flag off and can work on ipv6 traffic
Realtek is commonly used in many systems. my one is zimaborad 832. embedded with realtek nic