diff --git a/BasiliskII/src/slirp/if.c b/BasiliskII/src/slirp/if.c
index 2ce9a642..94132ca8 100644
--- a/BasiliskII/src/slirp/if.c
+++ b/BasiliskII/src/slirp/if.c
@@ -52,8 +52,8 @@ if_init()
 	if_maxlinkhdr = 40;
 #endif
 #else
-        /* 14 for ethernet + 40 */
-        if_maxlinkhdr = 14 + 40;
+        /* 2 for alignment, 14 for ethernet, 40 for TCP/IP */
+        if_maxlinkhdr = 2 + 14 + 40;
 #endif
 	if_mtu = 1500;
 	if_mru = 1500;
diff --git a/BasiliskII/src/slirp/ip_input.c b/BasiliskII/src/slirp/ip_input.c
index 74b92231..4f5bfd9a 100644
--- a/BasiliskII/src/slirp/ip_input.c
+++ b/BasiliskII/src/slirp/ip_input.c
@@ -344,8 +344,8 @@ insert:
 	while (q != (struct ipasfrag *)fp) {
 	  struct mbuf *t;
 	  t = dtom(q);
-	  m_cat(m, t);
 	  q = (struct ipasfrag *) q->ipf_next;
+	  m_cat(m, t);
 	}
 
 	/*
diff --git a/BasiliskII/src/slirp/slirp.c b/BasiliskII/src/slirp/slirp.c
index dc8a566a..d95b3739 100644
--- a/BasiliskII/src/slirp/slirp.c
+++ b/BasiliskII/src/slirp/slirp.c
@@ -610,11 +610,12 @@ void slirp_input(const uint8_t *pkt, int pkt_len)
         m = m_get();
         if (!m)
             return;
-        m->m_len = pkt_len;
-        memcpy(m->m_data, pkt, pkt_len);
+        /* Note: we add to align the IP header */
+        m->m_len = pkt_len + 2;
+        memcpy(m->m_data + 2, pkt, pkt_len);
 
-        m->m_data += ETH_HLEN;
-        m->m_len -= ETH_HLEN;
+        m->m_data += 2 + ETH_HLEN;
+        m->m_len -= 2 + ETH_HLEN;
 
         ip_input(m);
         break;