Zhifei Fang

If we do need those options in the sub class, delete them we will have a problem

2

#81 See the DHCPv6_am, in the parse_options method, in there we need to know the interface information to compute the source ip address

[line 77](https://github.com/phaethon/scapy/blob/master/scapy/ansmachine.py#L77) of the file scapy/scapy/ansmachine.py will delete the iface option from the kargs, because it is in the list of sniff_options_list and send_options_list. Therefore the method of the parse_options...

Add detail grammar error output, which will help developer find the yacc grammar error quickly. The current version will only show an error with a single text, which is not...