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[lwip-devel] [bug #61653] PPP Netmask Changed

From: Sylvain Rochet
Subject: [lwip-devel] [bug #61653] PPP Netmask Changed
Date: Fri, 10 Dec 2021 10:01:46 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Follow-up Comment #1, bug #61653 (project lwip):

Hi Ashley,

What do you mean by "the PPP link is configured for netmask" ? 
For PPP "client mode", netmask can be set by IPCP from the peer if the peer
send the netmask option, otherwise is a sane default. Or is it
broken ? Could you send the PPP packet trace ?

get_mask() is a leftover from pppd and is for unix-like systems with multiple
interfaces and is only useful when IP forwarding is enabled on the client
side. It achieves something similar to ARP proxy. This is mostly a hack to
offer professional customers a subnet of more than one IP address and it is a
very uncommon design today, proper IP routing is preferred.



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