[strongSwan] AWS EC2 IKEv2 tunnel up but no throughput

Mon Jul 5 10:19:42 CEST 2021

Hello Lew,

How exactly are you testing the tunnel?
Also, please provide the output of iptables-save.

Kind regards
Noel

Am July 5, 2021 7:28:19 AM UTC schrieb Lewis Shobbrook <l.shobbrook at base2services.com>:
>Hi Guys,
>I have an IKEv2 tunnel that is established and up, but I am unable to
>route any packets across it.
>All ACL's are configured to allow UDP 500,4500 & protocols 50, 51 &
>icmp to/from the non aws end.
>Local iptables are permissive with default policys ACCEPT
>Security groups also allow anything outbound and the above ports &
>protos inbound.
>Here are a few particulars typically requested ahead of time.
>ip_forward is enabled rp_filter disabled as follows...
>net.ipv4.ip_forward = 1
>net.ipv4.conf.all.send_redirects = 0
>net.ipv4.conf.default.send_redirects = 0
>net.ipv4.tcp_max_syn_backlog = 1280
>net.ipv4.icmp_echo_ignore_broadcasts = 1
>net.ipv4.conf.all.accept_source_route = 0
>net.ipv4.conf.all.accept_redirects = 0
>net.ipv4.conf.all.secure_redirects = 0
>net.ipv4.conf.all.log_martians = 1
>net.ipv4.conf.default.accept_source_route = 0
>net.ipv4.conf.default.accept_redirects = 0
>net.ipv4.conf.default.secure_redirects = 0
>net.ipv4.icmp_echo_ignore_broadcasts = 1
>net.ipv4.icmp_ignore_bogus_error_responses = 1
>net.ipv4.tcp_syncookies = 1
>net.ipv4.conf.all.rp_filter = 0
>net.ipv4.conf.default.rp_filter = 0
>net.ipv4.tcp_mtu_probing = 1
>
>tcpdump just shows one way requests
>Looking at the 220 rt table I can see that the auto added route
>appears to be correct, and the xfrm policy nothing obvious to me, with
>no xfrm vi's used.
>Obfuscated ip's naturally...
>ip r li ta 220
>198.168.248.0/29 via 48.138.201.65 dev eth0 proto static src
>48.138.201.70
>ip xfrm policy
>src 48.138.201.64/26 dst 198.168.248.0/29
>    dir out priority 371839 ptype main
>    tmpl src 48.138.201.70 dst 68.169.15.170
>        proto esp spi 0x2c1e849e reqid 1 mode tunnel
>src 198.168.248.0/29 dst 48.138.201.64/26
>    dir fwd priority 371839 ptype main
>    tmpl src 68.148.15.170 dst 48.138.201.70
>        proto esp reqid 1 mode tunnel
>src 198.168.248.0/29 dst 48.138.201.64/26
>    dir in priority 371839 ptype main
>    tmpl src 68.148.15.170 dst 48.138.201.70
>        proto esp reqid 1 mode tunnel
>src 0.0.0.0/0 dst 0.0.0.0/0
>    socket in priority 0 ptype main
>src 0.0.0.0/0 dst 0.0.0.0/0
>    socket out priority 0 ptype main
>src 0.0.0.0/0 dst 0.0.0.0/0
>    socket in priority 0 ptype main
>src 0.0.0.0/0 dst 0.0.0.0/0
>    socket out priority 0 ptype main
>src ::/0 dst ::/0
>    socket in priority 0 ptype main
>src ::/0 dst ::/0
>    socket out priority 0 ptype main
>src ::/0 dst ::/0
>    socket in priority 0 ptype main
>src ::/0 dst ::/0
>    socket out priority 0 ptype main
>src 198.168.248.0/29 dst 48.138.201.64/26
>    dir fwd priority 371840 ptype main
>    tmpl src 68.148.15.170 dst 48.138.201.70
>        proto esp reqid 2 mode tunnel
>src 198.168.248.0/29 dst 48.138.201.64/26
>    dir in priority 371840 ptype main
>    tmpl src 68.148.15.170 dst 48.138.201.70
>        proto esp reqid 2 mode tunnel
>src 48.138.201.64/26 dst 198.168.248.0/29
>    dir out priority 371840 ptype main
>    tmpl src 48.138.201.70 dst 68.169.15.170
>        proto esp reqid 2 mode tunnel
>
>ipsec statusall
>Status of IKE charon daemon (strongSwan 5.7.2, Linux
>4.14.232-177.418.amzn2.x86_64, x86_64):
>  uptime: 54 minutes, since Jul 05 06:10:30 2021
>  malloc: sbrk 2846720, mmap 0, used 1023696, free 1823024
>  worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0,
>scheduled: 1
>  loaded plugins: charon pkcs11 tpm aesni aes des rc2 sha2 sha1 md4
>md5 mgf1 random nonce x509 revocation constraints acert pubkey pkcs1
>pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem openssl gcrypt fips-prf gmp
>curve25519 chapoly xcbc cmac hmac ctr ccm gcm curl attr kernel-netlink
>resolve socket-default farp stroke vici updown eap-identity eap-sim
>eap-aka eap-aka-3gpp eap-aka-3gpp2 eap-md5 eap-gtc eap-mschapv2
>eap-dynamic eap-radius eap-tls eap-ttls eap-peap xauth-generic
>xauth-eap xauth-pam xauth-noauth dhcp led duplicheck unity counters
>Listening IP addresses:
>  48.138.201.70
>Connections:
>tunnel1:  %any...68.148.15.170  IKEv2
>tunnel1:   local:  uses pre-shared key authentication
>tunnel1:   remote: uses pre-shared key authentication
>tunnel1:   child:  48.138.201.64/26 === 198.168.248.0/29 TUNNEL
>Security Associations (1 up, 0 connecting):
>tunnel1[2]: ESTABLISHED 24 minutes ago,
>48.138.201.70[48.138.201.70]...65.169.15.170[65.169.15.170]
>tunnel1[2]: IKEv2 SPIs: d3e732eb14d78aec_i* b06860d1ceee2f9a_r,
>rekeying disabled
>tunnel1[2]: IKE proposal: AES_GCM_16_256/PRF_HMAC_SHA2_384/ECP_384
>tunnel1{2}:  INSTALLED, TUNNEL, reqid 2, ESP in UDP SPIs: cb651f89_i
>479cff91_o
>tunnel1{2}:  AES_GCM_16_256, 0 bytes_i, 0 bytes_o, rekeying disabled
>tunnel1{2}:   48.138.201.64/26 === 198.168.248.0/30
>
>VPC flow logs show no proto 50, only 4500 & 500.
>I've also tried to clamp mss not that I expect it would have changed 0
>throughput
>iptables -t mangle -A FORWARD -m policy --pol ipsec --dir in -p tcp -m
>tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1361:1536 -j TCPMSS
>--set-mss 1360
>
>I've spent hours searching but have not found anything to help.
>Hoping someone here may have a suggestion ot two?
>Cheers,
>
>Lew

Sent from mobile
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