[Openswan Users] UDP fragmentation in Linux

[Rolf Offermanns]

Marcus Leech wrote:

> That appears to be the correct behaviour.
> 
> Do you run iptables on your system?  What sysctl variables do you have set?
I do not have any active iptable rules.
sysctl from /proc/sys/net attached.

-Rolf
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./ipv6/conf/vmnet8/max_addresses:16
./ipv6/conf/vmnet8/max_desync_factor:600
./ipv6/conf/vmnet8/regen_max_retry:5
./ipv6/conf/vmnet8/temp_prefered_lft:86400
./ipv6/conf/vmnet8/temp_valid_lft:604800
./ipv6/conf/vmnet8/use_tempaddr:0
./ipv6/conf/vmnet8/force_mld_version:0
./ipv6/conf/vmnet8/router_solicitation_delay:1
./ipv6/conf/vmnet8/router_solicitation_interval:4
./ipv6/conf/vmnet8/router_solicitations:3
./ipv6/conf/vmnet8/dad_transmits:1
./ipv6/conf/vmnet8/autoconf:1
./ipv6/conf/vmnet8/accept_redirects:1
./ipv6/conf/vmnet8/accept_ra:1
./ipv6/conf/vmnet8/mtu:1500
./ipv6/conf/vmnet8/hop_limit:64
./ipv6/conf/vmnet8/forwarding:0
./ipv6/conf/vmnet1/max_addresses:16
./ipv6/conf/vmnet1/max_desync_factor:600
./ipv6/conf/vmnet1/regen_max_retry:5
./ipv6/conf/vmnet1/temp_prefered_lft:86400
./ipv6/conf/vmnet1/temp_valid_lft:604800
./ipv6/conf/vmnet1/use_tempaddr:0
./ipv6/conf/vmnet1/force_mld_version:0
./ipv6/conf/vmnet1/router_solicitation_delay:1
./ipv6/conf/vmnet1/router_solicitation_interval:4
./ipv6/conf/vmnet1/router_solicitations:3
./ipv6/conf/vmnet1/dad_transmits:1
./ipv6/conf/vmnet1/autoconf:1
./ipv6/conf/vmnet1/accept_redirects:1
./ipv6/conf/vmnet1/accept_ra:1
./ipv6/conf/vmnet1/mtu:1500
./ipv6/conf/vmnet1/hop_limit:64
./ipv6/conf/vmnet1/forwarding:0
./ipv6/conf/default/max_addresses:16
./ipv6/conf/default/max_desync_factor:600
./ipv6/conf/default/regen_max_retry:5
./ipv6/conf/default/temp_prefered_lft:86400
./ipv6/conf/default/temp_valid_lft:604800
./ipv6/conf/default/use_tempaddr:0
./ipv6/conf/default/force_mld_version:0
./ipv6/conf/default/router_solicitation_delay:1
./ipv6/conf/default/router_solicitation_interval:4
./ipv6/conf/default/router_solicitations:3
./ipv6/conf/default/dad_transmits:1
./ipv6/conf/default/autoconf:1
./ipv6/conf/default/accept_redirects:1
./ipv6/conf/default/accept_ra:1
./ipv6/conf/default/mtu:1280
./ipv6/conf/default/hop_limit:64
./ipv6/conf/default/forwarding:0
./ipv6/conf/all/max_addresses:16
./ipv6/conf/all/max_desync_factor:600
./ipv6/conf/all/regen_max_retry:5
./ipv6/conf/all/temp_prefered_lft:86400
./ipv6/conf/all/temp_valid_lft:604800
./ipv6/conf/all/use_tempaddr:0
./ipv6/conf/all/force_mld_version:0
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./ipv6/conf/all/router_solicitations:3
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./ipv6/conf/all/mtu:1280
./ipv6/conf/all/hop_limit:64
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./ipv6/conf/eth0/regen_max_retry:5
./ipv6/conf/eth0/temp_prefered_lft:86400
./ipv6/conf/eth0/temp_valid_lft:604800
./ipv6/conf/eth0/use_tempaddr:0
./ipv6/conf/eth0/force_mld_version:0
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./ipv6/conf/eth0/router_solicitation_interval:4
./ipv6/conf/eth0/router_solicitations:3
./ipv6/conf/eth0/dad_transmits:1
./ipv6/conf/eth0/autoconf:1
./ipv6/conf/eth0/accept_redirects:1
./ipv6/conf/eth0/accept_ra:1
./ipv6/conf/eth0/mtu:1500
./ipv6/conf/eth0/hop_limit:64
./ipv6/conf/eth0/forwarding:0
./ipv6/conf/lo/max_addresses:16
./ipv6/conf/lo/max_desync_factor:600
./ipv6/conf/lo/regen_max_retry:5
./ipv6/conf/lo/temp_prefered_lft:86400
./ipv6/conf/lo/temp_valid_lft:604800
./ipv6/conf/lo/use_tempaddr:-1
./ipv6/conf/lo/force_mld_version:0
./ipv6/conf/lo/router_solicitation_delay:1
./ipv6/conf/lo/router_solicitation_interval:4
./ipv6/conf/lo/router_solicitations:3
./ipv6/conf/lo/dad_transmits:1
./ipv6/conf/lo/autoconf:1
./ipv6/conf/lo/accept_redirects:1
./ipv6/conf/lo/accept_ra:1
./ipv6/conf/lo/mtu:16436
./ipv6/conf/lo/hop_limit:64
./ipv6/conf/lo/forwarding:0
./ipv6/neigh/vmnet8/locktime:0
./ipv6/neigh/vmnet8/proxy_delay:79
./ipv6/neigh/vmnet8/anycast_delay:99
./ipv6/neigh/vmnet8/proxy_qlen:64
./ipv6/neigh/vmnet8/unres_qlen:3
./ipv6/neigh/vmnet8/gc_stale_time:60
./ipv6/neigh/vmnet8/delay_first_probe_time:5
./ipv6/neigh/vmnet8/base_reachable_time:30
./ipv6/neigh/vmnet8/retrans_time:1000
./ipv6/neigh/vmnet8/app_solicit:0
./ipv6/neigh/vmnet8/ucast_solicit:3
./ipv6/neigh/vmnet8/mcast_solicit:3
./ipv6/neigh/vmnet1/locktime:0
./ipv6/neigh/vmnet1/proxy_delay:79
./ipv6/neigh/vmnet1/anycast_delay:99
./ipv6/neigh/vmnet1/proxy_qlen:64
./ipv6/neigh/vmnet1/unres_qlen:3
./ipv6/neigh/vmnet1/gc_stale_time:60
./ipv6/neigh/vmnet1/delay_first_probe_time:5
./ipv6/neigh/vmnet1/base_reachable_time:30
./ipv6/neigh/vmnet1/retrans_time:1000
./ipv6/neigh/vmnet1/app_solicit:0
./ipv6/neigh/vmnet1/ucast_solicit:3
./ipv6/neigh/vmnet1/mcast_solicit:3
./ipv6/neigh/eth0/locktime:0
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./ipv6/neigh/eth0/anycast_delay:99
./ipv6/neigh/eth0/proxy_qlen:64
./ipv6/neigh/eth0/unres_qlen:3
./ipv6/neigh/eth0/gc_stale_time:60
./ipv6/neigh/eth0/delay_first_probe_time:5
./ipv6/neigh/eth0/base_reachable_time:30
./ipv6/neigh/eth0/retrans_time:1000
./ipv6/neigh/eth0/app_solicit:0
./ipv6/neigh/eth0/ucast_solicit:3
./ipv6/neigh/eth0/mcast_solicit:3
./ipv6/neigh/lo/locktime:0
./ipv6/neigh/lo/proxy_delay:79
./ipv6/neigh/lo/anycast_delay:99
./ipv6/neigh/lo/proxy_qlen:64
./ipv6/neigh/lo/unres_qlen:3
./ipv6/neigh/lo/gc_stale_time:60
./ipv6/neigh/lo/delay_first_probe_time:5
./ipv6/neigh/lo/base_reachable_time:30
./ipv6/neigh/lo/retrans_time:1000
./ipv6/neigh/lo/app_solicit:0
./ipv6/neigh/lo/ucast_solicit:3
./ipv6/neigh/lo/mcast_solicit:3
./ipv6/neigh/default/gc_thresh3:1024
./ipv6/neigh/default/gc_thresh2:512
./ipv6/neigh/default/gc_thresh1:128
./ipv6/neigh/default/gc_interval:30
./ipv6/neigh/default/locktime:0
./ipv6/neigh/default/proxy_delay:79
./ipv6/neigh/default/anycast_delay:99
./ipv6/neigh/default/proxy_qlen:64
./ipv6/neigh/default/unres_qlen:3
./ipv6/neigh/default/gc_stale_time:60
./ipv6/neigh/default/delay_first_probe_time:5
./ipv6/neigh/default/base_reachable_time:30
./ipv6/neigh/default/retrans_time:1000
./ipv6/neigh/default/app_solicit:0
./ipv6/neigh/default/ucast_solicit:3
./ipv6/neigh/default/mcast_solicit:3
./ipv6/mld_max_msf:10
./ipv6/ip6frag_secret_interval:600
./ipv6/ip6frag_time:60
./ipv6/ip6frag_low_thresh:196608
./ipv6/ip6frag_high_thresh:262144
./ipv6/bindv6only:0
./ipv6/icmp/ratelimit:1000
./ipv6/route/min_adv_mss:1
./ipv6/route/mtu_expires:600
./ipv6/route/gc_elasticity:0
./ipv6/route/gc_interval:30
./ipv6/route/gc_timeout:60
./ipv6/route/gc_min_interval:0
./ipv6/route/max_size:4096
./ipv6/route/gc_thresh:1024
./ipv6/route/flush:./unix/max_dgram_qlen:10
./token-ring/rif_timeout:600000
./ipv4/ip_conntrack_max:32712
./ipv4/netfilter/ip_conntrack_tcp_max_retrans:3
./ipv4/netfilter/ip_conntrack_tcp_be_liberal:0
./ipv4/netfilter/ip_conntrack_tcp_loose:3
./ipv4/netfilter/ip_conntrack_tcp_timeout_max_retrans:300
./ipv4/netfilter/ip_conntrack_log_invalid:0
./ipv4/netfilter/ip_conntrack_generic_timeout:600
./ipv4/netfilter/ip_conntrack_icmp_timeout:30
./ipv4/netfilter/ip_conntrack_udp_timeout_stream:180
./ipv4/netfilter/ip_conntrack_udp_timeout:30
./ipv4/netfilter/ip_conntrack_tcp_timeout_close:10
./ipv4/netfilter/ip_conntrack_tcp_timeout_time_wait:120
./ipv4/netfilter/ip_conntrack_tcp_timeout_last_ack:30
./ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait:60
./ipv4/netfilter/ip_conntrack_tcp_timeout_fin_wait:120
./ipv4/netfilter/ip_conntrack_tcp_timeout_established:432000
./ipv4/netfilter/ip_conntrack_tcp_timeout_syn_recv:60
./ipv4/netfilter/ip_conntrack_tcp_timeout_syn_sent:120
./ipv4/netfilter/ip_conntrack_buckets:4089
./ipv4/netfilter/ip_conntrack_count:9
./ipv4/netfilter/ip_conntrack_max:32712
./ipv4/conf/vmnet8/force_igmp_version:0
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./ipv4/conf/vmnet8/accept_source_route:1
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./ipv4/conf/vmnet8/shared_media:1
./ipv4/conf/vmnet8/secure_redirects:1
./ipv4/conf/vmnet8/accept_redirects:1
./ipv4/conf/vmnet8/mc_forwarding:0
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./ipv4/conf/vmnet1/force_igmp_version:0
./ipv4/conf/vmnet1/disable_policy:0
./ipv4/conf/vmnet1/disable_xfrm:0
./ipv4/conf/vmnet1/arp_ignore:0
./ipv4/conf/vmnet1/arp_announce:0
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./ipv4/conf/vmnet1/tag:0
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./ipv4/conf/vmnet1/medium_id:0
./ipv4/conf/vmnet1/proxy_arp:0
./ipv4/conf/vmnet1/accept_source_route:1
./ipv4/conf/vmnet1/send_redirects:1
./ipv4/conf/vmnet1/rp_filter:1
./ipv4/conf/vmnet1/shared_media:1
./ipv4/conf/vmnet1/secure_redirects:1
./ipv4/conf/vmnet1/accept_redirects:1
./ipv4/conf/vmnet1/mc_forwarding:0
./ipv4/conf/vmnet1/forwarding:0
./ipv4/conf/eth0/force_igmp_version:0
./ipv4/conf/eth0/disable_policy:0
./ipv4/conf/eth0/disable_xfrm:0
./ipv4/conf/eth0/arp_ignore:0
./ipv4/conf/eth0/arp_announce:0
./ipv4/conf/eth0/arp_filter:0
./ipv4/conf/eth0/tag:0
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./ipv4/conf/eth0/bootp_relay:0
./ipv4/conf/eth0/medium_id:0
./ipv4/conf/eth0/proxy_arp:0
./ipv4/conf/eth0/accept_source_route:1
./ipv4/conf/eth0/send_redirects:1
./ipv4/conf/eth0/rp_filter:1
./ipv4/conf/eth0/shared_media:1
./ipv4/conf/eth0/secure_redirects:1
./ipv4/conf/eth0/accept_redirects:1
./ipv4/conf/eth0/mc_forwarding:0
./ipv4/conf/eth0/forwarding:0
./ipv4/conf/lo/force_igmp_version:0
./ipv4/conf/lo/disable_policy:1
./ipv4/conf/lo/disable_xfrm:1
./ipv4/conf/lo/arp_ignore:0
./ipv4/conf/lo/arp_announce:0
./ipv4/conf/lo/arp_filter:0
./ipv4/conf/lo/tag:0
./ipv4/conf/lo/log_martians:0
./ipv4/conf/lo/bootp_relay:0
./ipv4/conf/lo/medium_id:0
./ipv4/conf/lo/proxy_arp:0
./ipv4/conf/lo/accept_source_route:1
./ipv4/conf/lo/send_redirects:1
./ipv4/conf/lo/rp_filter:1
./ipv4/conf/lo/shared_media:1
./ipv4/conf/lo/secure_redirects:1
./ipv4/conf/lo/accept_redirects:1
./ipv4/conf/lo/mc_forwarding:0
./ipv4/conf/lo/forwarding:0
./ipv4/conf/default/force_igmp_version:0
./ipv4/conf/default/disable_policy:0
./ipv4/conf/default/disable_xfrm:0
./ipv4/conf/default/arp_ignore:0
./ipv4/conf/default/arp_announce:0
./ipv4/conf/default/arp_filter:0
./ipv4/conf/default/tag:0
./ipv4/conf/default/log_martians:0
./ipv4/conf/default/bootp_relay:0
./ipv4/conf/default/medium_id:0
./ipv4/conf/default/proxy_arp:0
./ipv4/conf/default/accept_source_route:1
./ipv4/conf/default/send_redirects:1
./ipv4/conf/default/rp_filter:1
./ipv4/conf/default/shared_media:1
./ipv4/conf/default/secure_redirects:1
./ipv4/conf/default/accept_redirects:1
./ipv4/conf/default/mc_forwarding:0
./ipv4/conf/default/forwarding:0
./ipv4/conf/all/force_igmp_version:0
./ipv4/conf/all/disable_policy:0
./ipv4/conf/all/disable_xfrm:0
./ipv4/conf/all/arp_ignore:0
./ipv4/conf/all/arp_announce:0
./ipv4/conf/all/arp_filter:0
./ipv4/conf/all/tag:0
./ipv4/conf/all/log_martians:0
./ipv4/conf/all/bootp_relay:0
./ipv4/conf/all/medium_id:0
./ipv4/conf/all/proxy_arp:0
./ipv4/conf/all/accept_source_route:0
./ipv4/conf/all/send_redirects:1
./ipv4/conf/all/rp_filter:1
./ipv4/conf/all/shared_media:1
./ipv4/conf/all/secure_redirects:1
./ipv4/conf/all/accept_redirects:1
./ipv4/conf/all/mc_forwarding:0
./ipv4/conf/all/forwarding:0
./ipv4/neigh/vmnet8/locktime:99
./ipv4/neigh/vmnet8/proxy_delay:79
./ipv4/neigh/vmnet8/anycast_delay:99
./ipv4/neigh/vmnet8/proxy_qlen:64
./ipv4/neigh/vmnet8/unres_qlen:3
./ipv4/neigh/vmnet8/gc_stale_time:60
./ipv4/neigh/vmnet8/delay_first_probe_time:5
./ipv4/neigh/vmnet8/base_reachable_time:30
./ipv4/neigh/vmnet8/retrans_time:99
./ipv4/neigh/vmnet8/app_solicit:0
./ipv4/neigh/vmnet8/ucast_solicit:3
./ipv4/neigh/vmnet8/mcast_solicit:3
./ipv4/neigh/vmnet1/locktime:99
./ipv4/neigh/vmnet1/proxy_delay:79
./ipv4/neigh/vmnet1/anycast_delay:99
./ipv4/neigh/vmnet1/proxy_qlen:64
./ipv4/neigh/vmnet1/unres_qlen:3
./ipv4/neigh/vmnet1/gc_stale_time:60
./ipv4/neigh/vmnet1/delay_first_probe_time:5
./ipv4/neigh/vmnet1/base_reachable_time:30
./ipv4/neigh/vmnet1/retrans_time:99
./ipv4/neigh/vmnet1/app_solicit:0
./ipv4/neigh/vmnet1/ucast_solicit:3
./ipv4/neigh/vmnet1/mcast_solicit:3
./ipv4/neigh/eth0/locktime:99
./ipv4/neigh/eth0/proxy_delay:79
./ipv4/neigh/eth0/anycast_delay:99
./ipv4/neigh/eth0/proxy_qlen:64
./ipv4/neigh/eth0/unres_qlen:3
./ipv4/neigh/eth0/gc_stale_time:60
./ipv4/neigh/eth0/delay_first_probe_time:5
./ipv4/neigh/eth0/base_reachable_time:30
./ipv4/neigh/eth0/retrans_time:99
./ipv4/neigh/eth0/app_solicit:0
./ipv4/neigh/eth0/ucast_solicit:3
./ipv4/neigh/eth0/mcast_solicit:3
./ipv4/neigh/lo/locktime:99
./ipv4/neigh/lo/proxy_delay:79
./ipv4/neigh/lo/anycast_delay:99
./ipv4/neigh/lo/proxy_qlen:64
./ipv4/neigh/lo/unres_qlen:3
./ipv4/neigh/lo/gc_stale_time:60
./ipv4/neigh/lo/delay_first_probe_time:5
./ipv4/neigh/lo/base_reachable_time:30
./ipv4/neigh/lo/retrans_time:99
./ipv4/neigh/lo/app_solicit:0
./ipv4/neigh/lo/ucast_solicit:3
./ipv4/neigh/lo/mcast_solicit:3
./ipv4/neigh/default/gc_thresh3:1024
./ipv4/neigh/default/gc_thresh2:512
./ipv4/neigh/default/gc_thresh1:128
./ipv4/neigh/default/gc_interval:30
./ipv4/neigh/default/locktime:99
./ipv4/neigh/default/proxy_delay:79
./ipv4/neigh/default/anycast_delay:99
./ipv4/neigh/default/proxy_qlen:64
./ipv4/neigh/default/unres_qlen:3
./ipv4/neigh/default/gc_stale_time:60
./ipv4/neigh/default/delay_first_probe_time:5
./ipv4/neigh/default/base_reachable_time:30
./ipv4/neigh/default/retrans_time:99
./ipv4/neigh/default/app_solicit:0
./ipv4/neigh/default/ucast_solicit:3
./ipv4/neigh/default/mcast_solicit:3
./ipv4/tcp_tso_win_divisor:8
./ipv4/tcp_moderate_rcvbuf:1
./ipv4/tcp_bic_low_window:14
./ipv4/tcp_bic_fast_convergence:1
./ipv4/tcp_bic:1
./ipv4/tcp_vegas_gamma:2
./ipv4/tcp_vegas_beta:6
./ipv4/tcp_vegas_alpha:2
./ipv4/tcp_vegas_cong_avoid:0
./ipv4/tcp_westwood:0
./ipv4/tcp_no_metrics_save:0
./ipv4/ipfrag_secret_interval:600
./ipv4/tcp_low_latency:0
./ipv4/tcp_frto:0
./ipv4/tcp_tw_reuse:0
./ipv4/icmp_ratemask:6168
./ipv4/icmp_ratelimit:1000
./ipv4/tcp_adv_win_scale:2
./ipv4/tcp_app_win:31
./ipv4/tcp_rmem:4096	87380	174760
./ipv4/tcp_wmem:4096	16384	131072
./ipv4/tcp_mem:49152	65536	98304
./ipv4/tcp_dsack:1
./ipv4/tcp_ecn:0
./ipv4/tcp_reordering:3
./ipv4/tcp_fack:1
./ipv4/tcp_orphan_retries:0
./ipv4/inet_peer_gc_maxtime:120
./ipv4/inet_peer_gc_mintime:10
./ipv4/inet_peer_maxttl:600
./ipv4/inet_peer_minttl:120
./ipv4/inet_peer_threshold:65664
./ipv4/igmp_max_msf:10
./ipv4/igmp_max_memberships:20
./ipv4/route/secret_interval:600
./ipv4/route/min_adv_mss:256
./ipv4/route/min_pmtu:552
./ipv4/route/mtu_expires:600
./ipv4/route/gc_elasticity:8
./ipv4/route/error_burst:5000
./ipv4/route/error_cost:1000
./ipv4/route/redirect_silence:20480
./ipv4/route/redirect_number:9
./ipv4/route/redirect_load:20
./ipv4/route/gc_interval:60
./ipv4/route/gc_timeout:300
./ipv4/route/gc_min_interval:0
./ipv4/route/max_size:65536
./ipv4/route/gc_thresh:4096
./ipv4/route/max_delay:10
./ipv4/route/min_delay:2
./ipv4/route/flush:./ipv4/icmp_ignore_bogus_error_responses:0
./ipv4/icmp_echo_ignore_broadcasts:0
./ipv4/icmp_echo_ignore_all:0
./ipv4/ip_local_port_range:32768	61000
./ipv4/tcp_max_syn_backlog:1024
./ipv4/tcp_rfc1337:0
./ipv4/tcp_stdurg:0
./ipv4/tcp_abort_on_overflow:0
./ipv4/tcp_tw_recycle:0
./ipv4/tcp_syncookies:0
./ipv4/tcp_fin_timeout:60
./ipv4/tcp_retries2:15
./ipv4/tcp_retries1:3
./ipv4/tcp_keepalive_intvl:75
./ipv4/tcp_keepalive_probes:9
./ipv4/tcp_keepalive_time:7200
./ipv4/ipfrag_time:30
./ipv4/ip_dynaddr:0
./ipv4/ipfrag_low_thresh:196608
./ipv4/ipfrag_high_thresh:262144
./ipv4/tcp_max_tw_buckets:180000
./ipv4/tcp_max_orphans:16384
./ipv4/tcp_synack_retries:5
./ipv4/tcp_syn_retries:5
./ipv4/ip_nonlocal_bind:0
./ipv4/ip_no_pmtu_disc:0
./ipv4/ip_autoconfig:0
./ipv4/ip_default_ttl:64
./ipv4/ip_forward:0
./ipv4/tcp_retrans_collapse:1
./ipv4/tcp_sack:1
./ipv4/tcp_window_scaling:1
./ipv4/tcp_timestamps:1
./core/somaxconn:128
./core/optmem_max:10240
./core/message_burst:10
./core/message_cost:5
./core/mod_cong:290
./core/lo_cong:100
./core/no_cong:20
./core/no_cong_thresh:10
./core/netdev_max_backlog:300
./core/dev_weight:64
./core/rmem_default:111616
./core/wmem_default:111616
./core/rmem_max:111616
./core/wmem_max:111616