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Subject: bin/2188: ijppp incompatable with SLIRP
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>Number:         2188
>Category:       bin
>Synopsis:       ijppp incompatable with SLIRP
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec  9 11:00:01 PST 1996
>Last-Modified:
>Originator:     Nick Sayer
>Organization:
just me
>Release:        FreeBSD 2.2-ALPHA i386
>Environment:

ijppp dialing into slirp. Default parameters on both ends, except
slirp uses ppp (default is slip), and lqr has been disabled on ijppp
(see related PR).

>Description:

SLIRP's statistics file claims that all IP packets transmitted from
ijppp are 'unaligned'. win95 into slirp works just fine, so I suspect
it's ijppp's fault.

>How-To-Repeat:

I don't know how much this helps, as I have not spent much time trying
to track this down, but this is the only code that conceivably could
increment the unaligned frame count on slirp. It is in ppp.c:

        if (proto != PROTO_VJCOMP && ((long)m->m_data & 3)) {
                ipstat.ips_unaligned++;
                memmove((u_char *)(m->m_data - ((long)m->m_data & 3)),
                    m->m_data, m->m_len);
                m->m_data -= ((long)m->m_data) & 3;
        }

>Fix:
	
none known at present. Disabling vj didn't help any.

>Audit-Trail:
>Unformatted: