---
name: "thcsyn6"
section: "8"
platform: "linux"
package: "thc-ipv6"
version: "3.8-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/thcsyn6"
---

# thcsyn6(8)

## NAME

**thcsyn6**

## SYNOPSIS

thcsyn6 \[-aAcdDfrORS\] \[-i microsecond\] \[-m dstmac\] \[-p port\] \[-s sourceip6\] interface target port

## OPTIONS

```
 -i      sending interval of packets (in microseconds)
 -a      add hop-by-hop header with router alert
 -d      add destination header (can be set up to 64 times)
 -f      add atomic fragmentation header (can be set up to 64 times)
 -A      send TCP-ACK packets
 -S      send TCP-SYN-ACK packets
 -r      randomize the source from your /64 prefix
 -R      randomize the source fully
 -D      randomize the destination (treat as /64)
 -O      add a TCP Fast Open cookie (SYN-only packets)
 -m dstmac     use this destination mac address
 -s sourceip6  use this as source IPv6 address
 -p port       use fixed source port
Flood the target port with TCP-SYN packets. If you supply "x" as port, it
is randomized.
```

## AUTHOR

thc-ipv6 was written by van Hauser \<vh@thc.org\> / THC

The homepage for this toolkit is: https://github.com/vanhauser-thc/thc-ipv6

## COPYRIGHT

thcsyn6 3.8 (c) 2020 by van Hauser / THC \<vh@thc.org\> www.github.com/vanhauser-thc/thc-ipv6